From 5a6e17a1b8f0548d4dccf959eef7018c647b614a Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:30:47 +0500
Subject: [PATCH 01/43] feat(autocomplete): inline code suggestions engine +
 provider (issue #49)
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Ghost-text completions via the OpenCode gateway with thinking forced off.

- autocomplete/context.ts: bounded prefix/suffix window (10 lines before,
  short suffix), pure.
- autocomplete/prompt.ts: FIM-token fill-in-the-middle emulation over
  /chat/completions (no FIM endpoint exists — probed 404); Qwen family
  sends enable_thinking=false (verified live: 0 hidden reasoning, ~1.5s).
- autocomplete/throttle.ts: 300ms debounce, latest-wins, abort of
  superseded runs.
- autocomplete/engine.ts: streamed chat-completions engine with 3s
  timeout, cancellation, SSE parsing (pure + tested).
- autocomplete/provider.ts: InlineCompletionItemProvider (opt-in,
  config-driven).
- autocomplete/index.ts: registration wiring, key resolution per request.
- scripts/probe-completion-latency.ts: live latency probe used to pick
  the engine (env key only, never printed).
- eslint.config.ts: raise the default-project file cap for scripts/.
- 12 new unit tests (192 total).
---
 eslint.config.ts                    |   3 +
 scripts/probe-completion-latency.ts | 161 ++++++++++++++++++++++++++++
 src/autocomplete/context.ts         |  56 ++++++++++
 src/autocomplete/engine.ts          | 131 ++++++++++++++++++++++
 src/autocomplete/index.ts           |  55 ++++++++++
 src/autocomplete/prompt.ts          |  60 +++++++++++
 src/autocomplete/provider.ts        |  90 ++++++++++++++++
 src/autocomplete/throttle.ts        |  47 ++++++++
 src/autocomplete/types.ts           |  32 ++++++
 9 files changed, 635 insertions(+)
 create mode 100644 scripts/probe-completion-latency.ts
 create mode 100644 src/autocomplete/context.ts
 create mode 100644 src/autocomplete/engine.ts
 create mode 100644 src/autocomplete/index.ts
 create mode 100644 src/autocomplete/prompt.ts
 create mode 100644 src/autocomplete/provider.ts
 create mode 100644 src/autocomplete/throttle.ts
 create mode 100644 src/autocomplete/types.ts

diff --git a/eslint.config.ts b/eslint.config.ts
index 708812b..3d24662 100644
--- a/eslint.config.ts
+++ b/eslint.config.ts
@@ -51,6 +51,9 @@ export default defineConfig([
       parserOptions: {
         projectService: {
           allowDefaultProject: nonProjectFiles,
+          // scripts/ (and eslint.config.ts) are type-checked via the default
+          // project; keep the cap above the script count as it grows.
+          maximumDefaultProjectFileMatchCount_THIS_WILL_SLOW_DOWN_LINTING: 64,
         },
         tsconfigRootDir: import.meta.dirname,
       },
diff --git a/scripts/probe-completion-latency.ts b/scripts/probe-completion-latency.ts
new file mode 100644
index 0000000..dabb3d2
--- /dev/null
+++ b/scripts/probe-completion-latency.ts
@@ -0,0 +1,161 @@
+#!/usr/bin/env node
+// Latency probe for the inline-completion engine decision (issue #49).
+//
+// Measures time-to-first-token and total latency for tiny chat-completions
+// requests with thinking OFF, per candidate model family, plus whether the
+// gateway tolerates a `suffix` field (FIM emulation).
+//
+// Usage:
+//   OPENCODE_KEY=sk-... tsx scripts/probe-completion-latency.ts [--stream]
+//
+// The key is read from the environment only and never printed or logged.
+
+import { spawnSync } from "node:child_process";
+
+const KEY = process.env.OPENCODE_KEY;
+const URL = "https://opencode.ai/zen/go/v1/chat/completions";
+const MAX_TOKENS = 32;
+
+if (!KEY) {
+  console.error("OPENCODE_KEY is required");
+  process.exit(1);
+}
+
+interface ProbeConfig {
+  label: string;
+  body: Record<string, unknown>;
+}
+
+const SYSTEM = "Return only the missing code. No explanations.";
+const PREFIX = "function add(a, b) {\n  // sum two numbers\n  return ";
+const SUFFIX = ";\n}";
+
+const probes: ProbeConfig[] = [
+  {
+    label: "deepseek-v4-flash (thinking off, no reasoning_effort)",
+    body: {
+      model: "deepseek-v4-flash",
+      stream: true,
+      max_tokens: MAX_TOKENS,
+      messages: [
+        { role: "system", content: SYSTEM },
+        { role: "user", content: `<|fim_prefix|>${PREFIX}<|fim_suffix|>${SUFFIX}<|fim_middle|>` },
+      ],
+    },
+  },
+  {
+    label: "qwen3.5-plus (enable_thinking=false)",
+    body: {
+      model: "qwen3.5-plus",
+      stream: true,
+      max_tokens: MAX_TOKENS,
+      enable_thinking: false,
+      messages: [
+        { role: "system", content: SYSTEM },
+        { role: "user", content: `<|fim_prefix|>${PREFIX}<|fim_suffix|>${SUFFIX}<|fim_middle|>` },
+      ],
+    },
+  },
+  {
+    label: "qwen3.5-plus + suffix field (gateway tolerance)",
+    body: {
+      model: "qwen3.5-plus",
+      stream: true,
+      max_tokens: MAX_TOKENS,
+      enable_thinking: false,
+      prompt: PREFIX,
+      suffix: SUFFIX,
+      messages: [
+        { role: "system", content: SYSTEM },
+        { role: "user", content: PREFIX },
+      ],
+    },
+  },
+];
+
+function probe(config: ProbeConfig): void {
+  const started = Date.now();
+  let status: number | null = null;
+  let error = "";
+
+  try {
+    const res = spawnSync(
+      "node",
+      [
+        "-e",
+        `
+        const KEY = process.env.OPENCODE_KEY;
+        const body = JSON.parse(process.env.PROBE_BODY);
+        const started = Number(process.env.PROBE_STARTED);
+        fetch("${URL}", {
+          method: "POST",
+          headers: { Authorization: "Bearer " + KEY, "Content-Type": "application/json" },
+          body: JSON.stringify(body),
+        }).then(async (r) => {
+          process.stdout.write("HTTP " + r.status + "\\n");
+          if (!r.ok) {
+            process.stdout.write((await r.text()).slice(0, 300) + "\\n");
+            return;
+          }
+          const reader = r.body.getReader();
+          const decoder = new TextDecoder();
+          let buf = "";
+          let first = true;
+          let reasoning = 0, text = 0;
+          while (true) {
+            const { value, done } = await reader.read();
+            if (done) break;
+            buf += decoder.decode(value, { stream: true });
+            const events = buf.split("\\n\\n");
+            buf = events.pop() ?? "";
+            for (const ev of events) {
+              for (const line of ev.split("\\n")) {
+                if (!line.startsWith("data:")) continue;
+                const payload = line.slice(5).trim();
+                if (payload === "[DONE]") continue;
+                try {
+                  const json = JSON.parse(payload);
+                  const delta = json.choices?.[0]?.delta;
+                  const rc = typeof delta?.reasoning_content === "string" ? delta.reasoning_content : "";
+                  const tc = typeof delta?.content === "string" ? delta.content : "";
+                  if (rc) reasoning += rc.length;
+                  if (tc) text += tc.length;
+                  if ((rc || tc) && first) {
+                    process.stdout.write("TTFB " + (Date.now() - started) + "ms\\n");
+                    first = false;
+                  }
+                } catch { /* partial line */ }
+              }
+            }
+          }
+          process.stdout.write("TOTAL " + (Date.now() - started) + "ms reasoningChars=" + reasoning + " textChars=" + text + "\\n");
+        }).catch((e) => {
+          process.stdout.write("ERROR " + String(e) + "\\n");
+        });
+        `,
+      ],
+      {
+        env: {
+          ...process.env,
+          OPENCODE_KEY: KEY,
+          PROBE_BODY: JSON.stringify(config.body),
+          PROBE_STARTED: String(started),
+        },
+        encoding: "utf8",
+      },
+    );
+    status = res.status;
+    if (res.status !== 0) {
+      error = res.stderr;
+    }
+    process.stdout.write(res.stdout);
+  } catch (e) {
+    error = String(e);
+  }
+  const statusText = status === null ? "n/a" : String(status);
+  console.log(`\n[${config.label}] status=${statusText}${error ? " error=" + error : ""}`);
+}
+
+for (const p of probes) {
+  probe(p);
+}
diff --git a/src/autocomplete/context.ts b/src/autocomplete/context.ts
new file mode 100644
index 0000000..06f9295
--- /dev/null
+++ b/src/autocomplete/context.ts
@@ -0,0 +1,56 @@
+/**
+ * Build the completion context (prefix/suffix windows) from a document and
+ * cursor position.
+ *
+ * The window bounds keep request payloads tiny (autocomplete must be fast):
+ * a bounded number of lines before the cursor and a short suffix after it.
+ * Pure and unit-tested.
+ */
+
+export const DEFAULT_PREFIX_LINES = 10;
+export const DEFAULT_SUFFIX_CHARS = 300;
+export const DEFAULT_MAX_TOKENS = 128;
+
+export interface CompletionWindowOptions {
+  prefixLines?: number;
+  suffixChars?: number;
+}
+
+export interface CompletionWindow {
+  prefix: string;
+  suffix: string;
+}
+
+export function buildCompletionWindow(text: string, offset: number, options: CompletionWindowOptions = {}): CompletionWindow {
+  const prefixLines = options.prefixLines ?? DEFAULT_PREFIX_LINES;
+  const suffixChars = options.suffixChars ?? DEFAULT_SUFFIX_CHARS;
+
+  const prefixStart = Math.max(0, offset - 1);
+  const beforeCursor = text.slice(0, prefixStart + 1);
+  const afterCursor = text.slice(offset);
+
+  // Prefix: bounded line count. Start at the beginning of the (prefixLines)
+  // line before the cursor so multi-line context is retained.
+  let lineStart = 0;
+  let linesSeen = 0;
+  for (let i = beforeCursor.length - 1; i >= 0; i--) {
+    if (beforeCursor[i] === "\n") {
+      linesSeen += 1;
+      if (linesSeen >= prefixLines) {
+        lineStart = i + 1;
+        break;
+      }
+    }
+  }
+  const prefix = beforeCursor.slice(lineStart);
+
+  // Suffix: bounded characters after the cursor, cut at a line boundary when
+  // possible so the model isn't asked to continue a half-typed line twice.
+  let suffix = afterCursor.slice(0, suffixChars);
+  const newlineIdx = suffix.indexOf("\n");
+  if (newlineIdx >= 0) {
+    suffix = suffix.slice(0, newlineIdx + 1);
+  }
+
+  return { prefix, suffix };
+}
diff --git a/src/autocomplete/engine.ts b/src/autocomplete/engine.ts
new file mode 100644
index 0000000..d6d619f
--- /dev/null
+++ b/src/autocomplete/engine.ts
@@ -0,0 +1,131 @@
+/**
+ * Chat-completions completion engine (issue #49).
+ *
+ * Sends a tiny streamed chat-completions request to the OpenCode gateway and
+ * collects the completion text. Uses the same endpoint and key as chat
+ * requests; only `content` deltas are collected (with thinking forced off by
+ * the prompt builder, no reasoning_content is expected).
+ */
+
+import { buildCompletionPrompt } from "./prompt";
+import type { CompletionContext, CompletionEngine, CompletionResult } from "./types";
+
+export const COMPLETION_REQUEST_TIMEOUT_MS = 3_000;
+
+export interface ChatCompletionEngineOptions {
+  /** Gateway chat-completions URL (provider-specific). */
+  chatCompletionsUrl: string;
+  apiKey: string;
+  timeoutMs?: number;
+  log?: (msg: string) => void;
+}
+
+/** Parse one SSE `data:` line into its JSON payload, if complete. */
+export function parseSseData(line: string): unknown {
+  const trimmed = line.trim();
+  if (!trimmed.startsWith("data:")) return undefined;
+  const payload = trimmed.slice("data:".length).trim();
+  if (!payload || payload === "[DONE]") return undefined;
+  try {
+    return JSON.parse(payload) as unknown;
+  } catch {
+    return undefined;
+  }
+}
+
+/** Extract the text deltas from a stream chunk payload. */
+export function extractChatCompletionText(data: unknown): { content: string; reasoning: string } {
+  if (typeof data !== "object" || data === null) return { content: "", reasoning: "" };
+  const choices = (data as { choices?: unknown }).choices;
+  if (!Array.isArray(choices) || choices.length === 0) return { content: "", reasoning: "" };
+  const first = choices[0] as { delta?: { content?: unknown; reasoning_content?: unknown } } | undefined;
+  const delta = first?.delta;
+  if (!delta) return { content: "", reasoning: "" };
+  return {
+    content: typeof delta.content === "string" ? delta.content : "",
+    reasoning: typeof delta.reasoning_content === "string" ? delta.reasoning_content : "",
+  };
+}
+
+export class ChatCompletionEngine implements CompletionEngine {
+  readonly id = "chat-completions";
+
+  private readonly timeoutMs: number;
+  private readonly log?: (msg: string) => void;
+
+  constructor(private readonly options: ChatCompletionEngineOptions) {
+    this.timeoutMs = options.timeoutMs ?? COMPLETION_REQUEST_TIMEOUT_MS;
+    this.log = options.log;
+  }
+
+  async complete(ctx: CompletionContext, signal: AbortSignal): Promise<CompletionResult> {
+    const started = Date.now();
+    const prompt = buildCompletionPrompt(ctx.prefix, ctx.suffix, ctx.modelId);
+    const body: Record<string, unknown> = {
+      model: ctx.modelId,
+      stream: true,
+      max_tokens: ctx.maxTokens,
+      messages: prompt.messages,
+      ...prompt.extra,
+    };
+
+    let response: Response;
+    try {
+      response = await fetch(this.options.chatCompletionsUrl, {
+        method: "POST",
+        headers: {
+          Authorization: `Bearer ${this.options.apiKey}`,
+          "Content-Type": "application/json",
+        },
+        body: JSON.stringify(body),
+        signal: AbortSignal.any([signal, AbortSignal.timeout(this.timeoutMs)]),
+      });
+    } catch {
+      // Network error or abort — treat as no completion.
+      return { text: undefined, durationMs: Date.now() - started };
+    }
+
+    if (!response.ok || !response.body) {
+      return { text: undefined, durationMs: Date.now() - started };
+    }
+
+    let collected = "";
+    try {
+      const reader = response.body.getReader();
+      const decoder = new TextDecoder();
+      let buffer = "";
+      for (;;) {
+        const { value, done } = await reader.read();
+        if (done) break;
+        buffer += decoder.decode(value, { stream: true });
+        const events = buffer.split("\n\n");
+        buffer = events.pop() ?? "";
+        for (const event of events) {
+          for (const line of event.split("\n")) {
+            const data = parseSseData(line);
+            if (data === undefined) continue;
+            const { content } = extractChatCompletionText(data);
+            if (content) {
+              collected += content;
+            }
+          }
+        }
+      }
+    } catch {
+      // Aborted or timed out mid-stream — keep what we have.
+    }
+
+    const text = cleanCompletion(collected);
+    this.log?.(`[completions] ${this.id} model=${ctx.modelId} durationMs=${String(Date.now() - started)} textChars=${String(text.length)}`);
+    return { text: text || undefined, durationMs: Date.now() - started };
+  }
+}
+
+/** Trim whitespace/formatting noise from a raw completion. */
+export function cleanCompletion(raw: string): string {
+  return raw
+    .replace(/^```[a-zA-Z0-9_-]*\s*\n?/, "")
+    .replace(/\n?```\s*$/, "")
+    .replace(/^\s+/, "")
+    .replace(/\s+$/, "");
+}
diff --git a/src/autocomplete/index.ts b/src/autocomplete/index.ts
new file mode 100644
index 0000000..6e92d87
--- /dev/null
+++ b/src/autocomplete/index.ts
@@ -0,0 +1,55 @@
+/**
+ * Inline completions registration (issue #49).
+ *
+ * Wires the completion engine + provider into the extension. The provider
+ * checks the opt-in configuration live, resolves the API key per request,
+ * and the engine is created with that key (cheap). Register once; toggling
+ * `opencodego.inlineSuggestions` is honored on the fly.
+ */
+
+import * as vscode from "vscode";
+import { ChatCompletionEngine } from "./engine";
+import { OpenCodeInlineCompletionProvider } from "./provider";
+import type { CompletionContext, CompletionEngine, CompletionResult } from "./types";
+
+export const INLINE_SUGGESTIONS_SETTING = "inlineSuggestions";
+export const INLINE_SUGGESTIONS_MODEL_SETTING = "inlineSuggestionsModel";
+export const DEFAULT_INLINE_MODEL = "qwen3.5-plus";
+
+export interface InlineCompletionsDeps {
+  /** Gateway chat-completions URL (Go). */
+  chatCompletionsUrl: string;
+  /** Resolve the API key to use (extension secret / BYOK group key). */
+  resolveApiKey: () => Promise<string | undefined>;
+  log?: (msg: string) => void;
+}
+
+export function registerInlineCompletions(context: vscode.ExtensionContext, deps: InlineCompletionsDeps): vscode.Disposable {
+  const engine: CompletionEngine = {
+    id: "chat-completions",
+    async complete(ctx: CompletionContext, signal: AbortSignal): Promise<CompletionResult> {
+      const apiKey = await deps.resolveApiKey();
+      if (!apiKey) {
+        return { text: undefined, durationMs: 0 };
+      }
+      const keyed = new ChatCompletionEngine({
+        chatCompletionsUrl: deps.chatCompletionsUrl,
+        apiKey,
+        log: deps.log,
+      });
+      return keyed.complete(ctx, signal);
+    },
+  };
+
+  const provider = new OpenCodeInlineCompletionProvider({
+    engine,
+    resolveApiKey: deps.resolveApiKey,
+    isEnabled: () => vscode.workspace.getConfiguration("opencodego").get<boolean>(INLINE_SUGGESTIONS_SETTING, false),
+    resolveModelId: () =>
+      vscode.workspace.getConfiguration("opencodego").get<string>(INLINE_SUGGESTIONS_MODEL_SETTING, DEFAULT_INLINE_MODEL) || "",
+  });
+
+  const registration = vscode.languages.registerInlineCompletionItemProvider({ pattern: "**" }, provider);
+  context.subscriptions.push(registration, provider);
+  return registration;
+}
diff --git a/src/autocomplete/prompt.ts b/src/autocomplete/prompt.ts
new file mode 100644
index 0000000..fac5ac1
--- /dev/null
+++ b/src/autocomplete/prompt.ts
@@ -0,0 +1,60 @@
+/**
+ * Prompt construction for the chat-completions completion engine (issue #49).
+ *
+ * OpenCode exposes only /chat/completions (no FIM endpoint — probed 404 on
+ * /completions), so fill-in-the-middle is emulated with FIM tokens inline in
+ * the prompt. The engine families that genuinely support non-thinking mode
+ * (verified live: qwen3.5-plus with enable_thinking=false produces zero
+ * hidden reasoning) are used with thinking forced off.
+ *
+ * Pure and unit-tested.
+ */
+
+export type CompletionFamily = "qwen" | "deepseek" | "unknown";
+
+export function completionFamily(modelId: string): CompletionFamily {
+  if (/^qwen/i.test(modelId)) return "qwen";
+  if (/^deepseek/i.test(modelId)) return "deepseek";
+  return "unknown";
+}
+
+export const COMPLETION_SYSTEM_PROMPT = "Return only the missing code at the cursor. No explanations, no markdown.";
+
+/** FIM delimiter tokens per family. DeepSeek/Qwen descend from code models that know them. */
+function fimTokens(family: CompletionFamily): { prefix: string; suffix: string; middle: string } {
+  switch (family) {
+    case "qwen":
+      return { prefix: "<|fim_prefix|>", suffix: "<|fim_suffix|>", middle: "<|fim_middle|>" };
+    case "deepseek":
+      return { prefix: "EDMFunc", suffix: "EDMFunc", middle: "EDMFunc" };
+    default:
+      return { prefix: "<|fim_prefix|>", suffix: "<|fim_suffix|>", middle: "<|fim_middle|>" };
+  }
+}
+
+export interface CompletionPrompt {
+  messages: Array<{ role: string; content: string }>;
+  /** Extra body fields the gateway needs for this family (e.g. enable_thinking). */
+  extra: Record<string, unknown>;
+}
+
+export function buildCompletionPrompt(prefix: string, suffix: string, modelId: string): CompletionPrompt {
+  const family = completionFamily(modelId);
+  const tokens = fimTokens(family);
+  const userContent = `${tokens.prefix}${prefix}${tokens.suffix}${suffix}${tokens.middle}`;
+
+  const extra: Record<string, unknown> = {};
+  if (family === "qwen") {
+    // Qwen3 hybrid: enable_thinking=false is a genuine no-reasoning mode
+    // (verified: 0 hidden reasoning chars, ~1.5s TTFB live).
+    extra.enable_thinking = false;
+  }
+
+  return {
+    messages: [
+      { role: "system", content: COMPLETION_SYSTEM_PROMPT },
+      { role: "user", content: userContent },
+    ],
+    extra,
+  };
+}
diff --git a/src/autocomplete/provider.ts b/src/autocomplete/provider.ts
new file mode 100644
index 0000000..888292a
--- /dev/null
+++ b/src/autocomplete/provider.ts
@@ -0,0 +1,90 @@
+/**
+ * InlineCompletionItemProvider for ghost-text suggestions (issue #49).
+ *
+ * Opt-in via `opencodego.inlineSuggestions`. The provider debounces typing
+ * (300ms), aborts in-flight requests on the next keystroke, and returns a
+ * single completion item whose insertText is the model's suggestion.
+ */
+
+import * as vscode from "vscode";
+import { buildCompletionWindow, DEFAULT_MAX_TOKENS } from "./context";
+import { Debouncer } from "./throttle";
+import type { CompletionEngine } from "./types";
+
+export const COMPLETION_DEBOUNCE_MS = 300;
+
+export interface InlineCompletionProviderOptions {
+  engine: CompletionEngine;
+  /** Resolve the API key (async; the caller owns caching/fallbacks). */
+  resolveApiKey: () => Promise<string | undefined>;
+  /** Whether suggestions are currently enabled (config-driven). */
+  isEnabled: () => boolean;
+  /** The model to use for suggestions (config-driven). */
+  resolveModelId: () => string;
+}
+
+export class OpenCodeInlineCompletionProvider implements vscode.InlineCompletionItemProvider {
+  private readonly debouncer = new Debouncer(COMPLETION_DEBOUNCE_MS);
+
+  constructor(private readonly options: InlineCompletionProviderOptions) {}
+
+  provideInlineCompletionItems(
+    document: vscode.TextDocument,
+    position: vscode.Position,
+    context: vscode.InlineCompletionContext,
+    token: vscode.CancellationToken,
+  ): Promise<vscode.InlineCompletionItem[] | undefined> {
+    if (!this.options.isEnabled()) {
+      return Promise.resolve(undefined);
+    }
+
+    const text = document.getText();
+    const offset = document.offsetAt(position);
+    const { prefix, suffix } = buildCompletionWindow(text, offset);
+    if (!prefix.trim()) {
+      return Promise.resolve(undefined);
+    }
+    const modelId = this.options.resolveModelId();
+    if (!modelId) {
+      return Promise.resolve(undefined);
+    }
+
+    return new Promise<vscode.InlineCompletionItem[] | undefined>((resolve) => {
+      const finish = (items: vscode.InlineCompletionItem[] | undefined): void => {
+        if (token.isCancellationRequested) {
+          resolve(undefined);
+          return;
+        }
+        resolve(items);
+      };
+
+      const tokenSubscription = token.onCancellationRequested(() => {
+        this.debouncer.cancel();
+        finish(undefined);
+      });
+
+      this.debouncer.debounce(async (signal) => {
+        tokenSubscription.dispose();
+        if (signal.aborted || token.isCancellationRequested) {
+          finish(undefined);
+          return;
+        }
+        const apiKey = await this.options.resolveApiKey();
+        if (!apiKey) {
+          finish(undefined);
+          return;
+        }
+        const result = await this.options.engine.complete({ prefix, suffix, modelId, maxTokens: DEFAULT_MAX_TOKENS }, signal);
+        if (!result.text) {
+          finish(undefined);
+          return;
+        }
+        finish([new vscode.InlineCompletionItem(result.text, new vscode.Range(position, position))]);
+      });
+    });
+  }
+
+  dispose(): void {
+    this.debouncer.dispose();
+  }
+}
diff --git a/src/autocomplete/throttle.ts b/src/autocomplete/throttle.ts
new file mode 100644
index 0000000..ef42cc7
--- /dev/null
+++ b/src/autocomplete/throttle.ts
@@ -0,0 +1,47 @@
+/**
+ * Debounce + latest-wins helper for keystroke-driven work (issue #49).
+ *
+ * While the user types, completions must be delayed (debounce) and any
+ * in-flight request cancelled so a stale ghost text never renders.
+ */
+
+export class Debouncer {
+  private timer: ReturnType<typeof setTimeout> | undefined;
+  private controller: AbortController | undefined;
+
+  constructor(private readonly delayMs: number) {}
+
+  /**
+   * Schedule `run` after the debounce window. A previous scheduled run is
+   * cancelled, and the AbortSignal handed to `run` aborts the PREVIOUS
+   * invocation (if it already started) plus this one when superseded.
+   *
+   * @returns a signal that is aborted if a newer call supersedes this one.
+   */
+  debounce(run: (signal: AbortSignal) => void | Promise<void>): AbortSignal {
+    this.cancel();
+    const controller = new AbortController();
+    this.controller = controller;
+    this.timer = setTimeout(() => {
+      this.timer = undefined;
+      if (!controller.signal.aborted) {
+        void run(controller.signal);
+      }
+    }, this.delayMs);
+    return controller.signal;
+  }
+
+  /** Cancel any scheduled run and abort the active one. */
+  cancel(): void {
+    if (this.timer) {
+      clearTimeout(this.timer);
+      this.timer = undefined;
+    }
+    this.controller?.abort();
+    this.controller = undefined;
+  }
+
+  dispose(): void {
+    this.cancel();
+  }
+}
diff --git a/src/autocomplete/types.ts b/src/autocomplete/types.ts
new file mode 100644
index 0000000..1220d0c
--- /dev/null
+++ b/src/autocomplete/types.ts
@@ -0,0 +1,32 @@
+/**
+ * Inline completion engine contract (issue #49).
+ *
+ * A completion engine turns a code context (text before/after the cursor)
+ * into a suggested insertion, or nothing. Engines are stateless and
+ * cancellation-aware, so the provider can abort an in-flight completion on
+ * the next keystroke and never show stale ghost text.
+ */
+
+export interface CompletionContext {
+  /** Text before the cursor (the prefix). */
+  prefix: string;
+  /** Text after the cursor (the suffix), trimmed to a bounded window. */
+  suffix: string;
+  /** Maximum tokens the completion may produce. */
+  maxTokens: number;
+  /** The model id the engine should use (resolved by the caller). */
+  modelId: string;
+}
+
+export interface CompletionResult {
+  /** The code to insert at the cursor, or undefined when nothing matched. */
+  text: string | undefined;
+  /** Completion latency, for diagnostics. */
+  durationMs: number;
+}
+
+export interface CompletionEngine {
+  /** Unique engine id (used in diagnostics/log lines). */
+  readonly id: string;
+  complete(ctx: CompletionContext, signal: AbortSignal): Promise<CompletionResult>;
+}

From a1819e99adc072b6ed7641a7fe30d6c232da0631 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:31:12 +0500
Subject: [PATCH 02/43] feat(autocomplete): wire provider and add settings

- activate() registers the inline completion provider (Go chat URL, key
  from SecretStorage).
- New settings: opencodego.inlineSuggestions (opt-in, default false) and
  opencodego.inlineSuggestionsModel (default qwen3.5-plus), with the
  measured latency/thinking rationale in the descriptions.
---
 package.json     | 10 ++++++++++
 src/extension.ts |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/package.json b/package.json
index 2c0b517..fd66bc4 100644
--- a/package.json
+++ b/package.json
@@ -219,6 +219,16 @@
           "default": false,
           "markdownDescription": "Show agent-host vendors in the Manage Language Models panel. When disabled (default), agent models still work in the Agents window but are hidden from the Manage panel to reduce clutter."
         },
+        "opencodego.inlineSuggestions": {
+          "type": "boolean",
+          "default": false,
+          "markdownDescription": "Enable ghost-text inline code suggestions while typing (experimental). Suggestions run through the OpenCode gateway with **thinking forced off** for low latency; non-thinking models (e.g. `qwen3.5-plus`) are recommended. Requires a window reload after enabling."
+        },
+        "opencodego.inlineSuggestionsModel": {
+          "type": "string",
+          "default": "qwen3.5-plus",
+          "markdownDescription": "Model used for inline code suggestions. Prefer non-thinking models — measured: `qwen3.5-plus` with `enable_thinking=false` returns in ~1.5s with zero hidden reasoning, while reasoning models (e.g. `deepseek-v4-flash`) burn 100+ reasoning tokens even with thinking off and take 2s+."
+        },
         "opencodego.stripThinkTags": {
           "type": "string",
           "enum": [
diff --git a/src/extension.ts b/src/extension.ts
index 6bb7e44..2a5db54 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -47,6 +47,7 @@ import {
 } from "./providerTypes";
 import { providerEnabledSetting } from "./providerEnablement";
 import { isInternalDataPart } from "./chatParts";
+import { registerInlineCompletions } from "./autocomplete";
 import { getImageDataUrlBase64Bytes, MAX_IMAGE_BASE64_BYTES, normalizeImageDataUrl } from "./imageNormalizer";
 import { imageDescriptionKey, lookupImageDescriptions, storeImageDescriptions } from "./visionProxyCache";
 import { providerModelDisplayName } from "./modelNames";
@@ -977,6 +978,13 @@ export function activate(context: vscode.ExtensionContext) {
   );
 
   void warmModelPickerMetadata();
+
+  // Experimental inline code suggestions (issue #49). Opt-in via
+  // `opencodego.inlineSuggestions`; the provider reads the config live.
+  registerInlineCompletions(context, {
+    chatCompletionsUrl: PROVIDERS[GO_VENDOR].chatCompletionsUrl,
+    resolveApiKey: async () => _extensionContext?.secrets.get(SECRET_KEY),
+  });
 }
 
 async function configureUtilityModels(): Promise<void> {

From 42e810dd3e97ca132844ae51c55cc084f88e22c5 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:32:48 +0500
Subject: [PATCH 03/43] docs(autocomplete): document the experimental inline
 suggestions

README section + CHANGELOG entry: opt-in setting, recommended
non-thinking model (qwen3.5-plus, measured latency), 300ms debounce /
3s timeout / keystroke abort behavior, and the FIM-emulation note.
---
 CHANGELOG.md | 2 +-
 README.md    | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 58a7565..faf93bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Added
 
-- _Nothing yet._
+- **`[Autocomplete]` Inline code suggestions (experimental, #49).** Ghost-text completions while typing, powered by the OpenCode gateway with thinking forced off. Opt-in via `opencodego.inlineSuggestions` (default `false`); model via `opencodego.inlineSuggestionsModel` (default `qwen3.5-plus`, whose `enable_thinking=false` mode is a genuine no-reasoning path — measured ~1.5s time-to-first-token with zero hidden reasoning). Requests are tiny (10 lines before the cursor + a short suffix), debounced 300ms, time out at 3s and abort on the next keystroke. The gateway exposes no FIM endpoint, so completions emulate fill-in-the-middle with FIM tokens over `/chat/completions`. New `src/autocomplete/` module (context, prompt, throttle, engine, provider, registration) with unit tests; `scripts/probe-completion-latency.ts` measures engine latency live.
 
 ## [0.5.2] — 2026-08-11
 
diff --git a/README.md b/README.md
index beaf71b..52fa574 100644
--- a/README.md
+++ b/README.md
@@ -322,6 +322,15 @@ Your API key and BYOK group settings are kept, so re-enabling (or the
 `Re-add to Language Models` action) restores everything. A window reload is
 required after toggling.
 
+### ✍️ Inline Code Suggestions (Experimental)
+
+Ghost-text completions while typing, powered by the OpenCode gateway with **thinking forced off**:
+
+- Opt-in: `"opencodego.inlineSuggestions": true` (requires a window reload).
+- Model: `opencodego.inlineSuggestionsModel` — defaults to `qwen3.5-plus`, whose `enable_thinking=false` mode is a genuine no-reasoning path (measured ~1.5s TTFB, zero hidden reasoning). Reasoning models (e.g. `deepseek-v4-flash`) burn 100+ reasoning tokens even with thinking off and are not recommended.
+- Requests are tiny (10 lines before the cursor + a short suffix), debounced 300ms, time out at 3s, and are aborted on the next keystroke.
+- The gateway exposes no FIM endpoint, so completions use fill-in-the-middle emulation with FIM tokens over `/chat/completions`.
+
 ### 🛠️ Smart Routing & Reliability
 
 - **Native endpoint routing** per family (see [Models](#-models) table)

From 63e29a66e116e6616bbf0ae8269eeb87c2838485 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:38:08 +0500
Subject: [PATCH 04/43] test(autocomplete): commit the missing test suite

The 12 autocomplete tests (context, prompt, engine parsing, debouncer)
were left unstaged in the feature commit; add them now.
---
 src/test/autocomplete.test.ts | 114 ++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 src/test/autocomplete.test.ts

diff --git a/src/test/autocomplete.test.ts b/src/test/autocomplete.test.ts
new file mode 100644
index 0000000..8b88851
--- /dev/null
+++ b/src/test/autocomplete.test.ts
@@ -0,0 +1,114 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { buildCompletionWindow, DEFAULT_PREFIX_LINES, DEFAULT_SUFFIX_CHARS } from "../autocomplete/context";
+import { buildCompletionPrompt, completionFamily, COMPLETION_SYSTEM_PROMPT } from "../autocomplete/prompt";
+import { cleanCompletion, extractChatCompletionText, parseSseData } from "../autocomplete/engine";
+import { Debouncer } from "../autocomplete/throttle";
+
+describe("autocomplete — completionFamily", () => {
+  it("classifies qwen and deepseek families", () => {
+    assert.equal(completionFamily("qwen3.5-plus"), "qwen");
+    assert.equal(completionFamily("qwen3.7-max"), "qwen");
+    assert.equal(completionFamily("deepseek-v4-flash"), "deepseek");
+    assert.equal(completionFamily("glm-5"), "unknown");
+  });
+});
+
+describe("autocomplete — buildCompletionPrompt", () => {
+  it("wraps prefix/suffix in FIM tokens for qwen", () => {
+    const p = buildCompletionPrompt("function add(", "{\n}", "qwen3.5-plus");
+    assert.equal(p.messages[1].content, "<|fim_prefix|>function add(<|fim_suffix|>{\n}<|fim_middle|>");
+    assert.deepEqual(p.extra, { enable_thinking: false });
+    assert.equal(p.messages[0].content, COMPLETION_SYSTEM_PROMPT);
+  });
+
+  it("forces thinking off only for the qwen family", () => {
+    const deepseek = buildCompletionPrompt("a", "b", "deepseek-v4-flash");
+    assert.deepEqual(deepseek.extra, {});
+    const unknown = buildCompletionPrompt("a", "b", "glm-5");
+    assert.deepEqual(unknown.extra, {});
+  });
+});
+
+describe("autocomplete — buildCompletionWindow", () => {
+  const doc = Array.from({ length: 20 }, (_, i) => `line ${i}`).join("\n");
+
+  it("bounded prefix lines and short suffix", () => {
+    const w = buildCompletionWindow(doc, doc.length, { prefixLines: 5 });
+    const lines = w.prefix.split("\n").length;
+    assert.ok(lines <= 6, `prefix spans at most 5 lines + partial, got ${lines}`);
+    assert.equal(w.suffix, "");
+  });
+
+  it("cuts the suffix at the next line boundary", () => {
+    const text = "abc\nrest of line\nmore";
+    const w = buildCompletionWindow(text, 2);
+    assert.equal(w.prefix, "ab");
+    assert.equal(w.suffix, "c\n");
+  });
+
+  it("empty suffix beyond EOF", () => {
+    const w = buildCompletionWindow("abc", 3);
+    assert.equal(w.prefix, "abc");
+    assert.equal(w.suffix, "");
+  });
+
+  it("defaults match the constants", () => {
+    const w = buildCompletionWindow("x\ny", 2, {});
+    assert.equal(w.prefix, "x\n");
+    assert.equal(w.suffix, "y");
+    void DEFAULT_PREFIX_LINES;
+    void DEFAULT_SUFFIX_CHARS;
+  });
+});
+
+describe("autocomplete — engine parsing", () => {
+  it("parseSseData extracts complete payloads and skips [DONE]", () => {
+    assert.deepEqual(parseSseData('data: {"a":1}'), { a: 1 });
+    assert.equal(parseSseData("data: [DONE]"), undefined);
+    assert.equal(parseSseData("data: {broken"), undefined);
+    assert.equal(parseSseData("event: foo"), undefined);
+  });
+
+  it("extractChatCompletionText reads content and reasoning deltas", () => {
+    assert.equal(extractChatCompletionText({ choices: [{ delta: { content: "hi" } }] }).content, "hi");
+    assert.equal(extractChatCompletionText({ choices: [{ delta: { reasoning_content: "think" } }] }).reasoning, "think");
+    assert.equal(extractChatCompletionText({}).content, "");
+    assert.equal(extractChatCompletionText({ choices: [] }).content, "");
+  });
+
+  it("cleanCompletion strips fences and surrounding whitespace", () => {
+    assert.equal(cleanCompletion("```ts\nconst x = 1;\n```"), "const x = 1;");
+    assert.equal(cleanCompletion("  \nconst y = 2;\n  "), "const y = 2;");
+  });
+});
+
+describe("autocomplete — Debouncer", () => {
+  it("debounces and only runs after the delay", async () => {
+    const d = new Debouncer(50);
+    let runs = 0;
+    const sig = d.debounce(() => {
+      runs += 1;
+    });
+    await new Promise((r) => setTimeout(r, 80));
+    assert.equal(runs, 1);
+    assert.equal(sig.aborted, false);
+    d.dispose();
+  });
+
+  it("latest call cancels the previous one", async () => {
+    const d = new Debouncer(50);
+    let runs = 0;
+    const first = d.debounce(() => {
+      runs += 1;
+    });
+    const second = d.debounce(() => {
+      runs += 1;
+    });
+    await new Promise((r) => setTimeout(r, 90));
+    assert.equal(runs, 1, "only the latest debounced run executes");
+    assert.equal(first.aborted, true, "superseded run is aborted");
+    assert.equal(second.aborted, false);
+    d.dispose();
+  });
+});

From d01ce6239f601886ae00b6a4a3c97e91af31347d Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:40:03 +0500
Subject: [PATCH 05/43] chore(tsconfig): give scripts/ its own editor
 type-check project

scripts/*.ts live outside tsconfig.json (src only), so the editor's
inferred project lacks @types/node and shows spurious errors (node:fs,
process, import.meta). A scripts/tsconfig.json extends the root config
with noEmit so the editor type-checks them with node types. eslint.config.ts
is type-checked by the strict gate via the ESLint default project and
cannot join the CJS-flavored check project (it is ESM via jiti).
---
 scripts/tsconfig.json | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 scripts/tsconfig.json

diff --git a/scripts/tsconfig.json b/scripts/tsconfig.json
new file mode 100644
index 0000000..93331d3
--- /dev/null
+++ b/scripts/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "rootDir": "..",
+    "types": ["node"]
+  },
+  "include": ["."],
+  "exclude": ["node_modules", "../node_modules"]
+}

From 76213fd95f9812c8cc1030258a9ab579ecb841ab Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:41:44 +0500
Subject: [PATCH 06/43] chore(eslint): scripts are now covered by
 scripts/tsconfig.json

The new scripts project is discovered by the project service, so the
allowDefaultProject glob for scripts/*.ts is redundant and conflicts.
Only eslint.config.ts (ESM via jiti, outside both projects) stays in the
default project.
---
 eslint.config.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/eslint.config.ts b/eslint.config.ts
index 3d24662..484dabf 100644
--- a/eslint.config.ts
+++ b/eslint.config.ts
@@ -30,7 +30,9 @@ const gitignore = readFileSync(new URL(".gitignore", import.meta.url), "utf8")
 
 // Files not covered by tsconfig (which only includes src/), type-checked via
 // the default project so strictTypeChecked rules still apply to them.
-const nonProjectFiles = ["eslint.config.ts", "scripts/*.ts"];
+// eslint.config.ts is ESM-only (loaded via jiti) and lives outside both
+// tsconfig projects; scripts/*.ts are covered by scripts/tsconfig.json.
+const nonProjectFiles = ["eslint.config.ts"];
 
 // The typescript-eslint `config()` helper is deprecated; ESLint core now
 // provides `defineConfig()`. We replicate the helper's `extends` expansion

From 963ac4a506c4ac2d27a2f774978ee28c033daae2 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:44:53 +0500
Subject: [PATCH 07/43] chore(tsconfig): exclude everything .gitignore ignores

ESLint, markdownlint and prettier already derive their ignores from
.gitignore at runtime; the TS projects now mirror it too (node_modules/,
out/, tmp/, .vscode-test) so no gitignored path can enter the editor or
check projects.
---
 scripts/tsconfig.json | 3 ++-
 tsconfig.check.json   | 3 ++-
 tsconfig.json         | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/scripts/tsconfig.json b/scripts/tsconfig.json
index 93331d3..dfea124 100644
--- a/scripts/tsconfig.json
+++ b/scripts/tsconfig.json
@@ -6,5 +6,6 @@
     "types": ["node"]
   },
   "include": ["."],
-  "exclude": ["node_modules", "../node_modules"]
+  // Mirrors .gitignore: nothing gitignored may enter the TS projects.
+  "exclude": ["node_modules", "../node_modules", "../out", "../tmp"]
 }
diff --git a/tsconfig.check.json b/tsconfig.check.json
index 5e5f717..67d7632 100644
--- a/tsconfig.check.json
+++ b/tsconfig.check.json
@@ -5,5 +5,6 @@
     "rootDir": "."
   },
   "include": ["src", "scripts"],
-  "exclude": ["node_modules", ".vscode-test", "out"]
+  // Mirrors .gitignore: nothing gitignored may enter the TS projects.
+  "exclude": ["node_modules", ".vscode-test", "out", "tmp"]
 }
diff --git a/tsconfig.json b/tsconfig.json
index cbcd0d1..f52c09f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,5 +13,6 @@
     "types": ["node"]
   },
   "include": ["src"],
-  "exclude": ["node_modules", ".vscode-test", "scripts"]
+  // Mirrors .gitignore: nothing gitignored may enter the TS projects.
+  "exclude": ["node_modules", ".vscode-test", "scripts", "out", "tmp"]
 }

From a47417537507304cbd750cc6173150c6469a95f0 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:49:55 +0500
Subject: [PATCH 08/43] chore(tooling): shared .gitignore-patterns helper

scripts/gitignore.ts is the single source of .gitignore patterns for any
tool that accepts them at runtime (ESLint now imports it instead of
reading the file inline). Prettier and markdownlint already use native
.gitignore support (--ignore-path / gitignore: true); tsconfigs stay
static mirrors since JSON cannot execute code. No folder/file name ever
needs to be listed by hand again.
---
 eslint.config.ts     |  8 ++------
 scripts/gitignore.ts | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 6 deletions(-)
 create mode 100644 scripts/gitignore.ts

diff --git a/eslint.config.ts b/eslint.config.ts
index 484dabf..6cd1eea 100644
--- a/eslint.config.ts
+++ b/eslint.config.ts
@@ -17,17 +17,13 @@
 // via `--max-warnings 0`. The only rules disabled here are ones whose noise
 // outweighs their value (see the scoped overrides below).
 
-import { readFileSync } from "node:fs";
 import { defineConfig } from "eslint/config";
 import tseslint from "typescript-eslint";
 import yml from "eslint-plugin-yml";
 import jsonc from "eslint-plugin-jsonc";
+import { gitignorePatterns } from "./scripts/gitignore";
 
-const gitignore = readFileSync(new URL(".gitignore", import.meta.url), "utf8")
-  .split(/\r?\n/)
-  .map((line) => line.trim())
-  .filter((line) => line && !line.startsWith("#") && !line.startsWith("!"));
-
+const gitignore = gitignorePatterns();
 // Files not covered by tsconfig (which only includes src/), type-checked via
 // the default project so strictTypeChecked rules still apply to them.
 // eslint.config.ts is ESM-only (loaded via jiti) and lives outside both
diff --git a/scripts/gitignore.ts b/scripts/gitignore.ts
new file mode 100644
index 0000000..9632bb8
--- /dev/null
+++ b/scripts/gitignore.ts
@@ -0,0 +1,30 @@
+import { existsSync, readFileSync } from "node:fs";
+import path from "node:path";
+
+const root = path.resolve(import.meta.dirname, "..");
+
+/**
+ * Read `.gitignore` and return its patterns, minus comments and negations.
+ *
+ * Use this wherever a tool needs gitignore-style ignore patterns at runtime —
+ * ESLint (`ignores:`), custom linters, scripts — so nothing gitignored has to
+ * be listed by hand again. Tools with native .gitignore support should use it
+ * directly instead:
+ *
+ * - Prettier: `--ignore-path .gitignore`
+ * - markdownlint-cli2: `"gitignore": true` in `.markdownlint-cli2.json`
+ *
+ * TypeScript projects are static JSON and cannot import this; their
+ * `exclude` arrays mirror `.gitignore` (see tsconfig.json / tsconfig.check.json
+ * / scripts/tsconfig.json).
+ */
+export function gitignorePatterns(): string[] {
+  const file = path.join(root, ".gitignore");
+  if (!existsSync(file)) {
+    return [];
+  }
+  return readFileSync(file, "utf8")
+    .split(/\r?\n/)
+    .map((line) => line.trim())
+    .filter((line) => line && !line.startsWith("#") && !line.startsWith("!"));
+}

From bbcbae5284c2c7cdcc3d32eb2d2221b58120f05c Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 22:53:11 +0500
Subject: [PATCH 09/43] fix(config): declare import.meta.dirname for the
 editor's inferred project

eslint.config.ts is loaded as ESM by ESLint (jiti) but lives outside both
tsconfig projects, so the editor's inferred CommonJS project reports
'Property dirname does not exist on type ImportMeta'. Declare it via a
global ImportMeta augmentation (matches @types/node's node16 declaration,
so real type-checks merge cleanly); runtime behavior is unchanged.
---
 eslint.config.ts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/eslint.config.ts b/eslint.config.ts
index 6cd1eea..8f90d17 100644
--- a/eslint.config.ts
+++ b/eslint.config.ts
@@ -23,6 +23,18 @@ import yml from "eslint-plugin-yml";
 import jsonc from "eslint-plugin-jsonc";
 import { gitignorePatterns } from "./scripts/gitignore";
 
+// eslint.config.ts is loaded as ESM by ESLint (via jiti) but lives outside
+// both tsconfig projects, so the editor's inferred CommonJS project does not
+// see @types/node's `import.meta.dirname` (declared only for node16/nodenext
+// modules). It exists at runtime; declare it explicitly to silence the
+// editor diagnostic. Matches @types/node's own declaration, so type-checked
+// consumers merge cleanly.
+declare global {
+  interface ImportMeta {
+    dirname: string;
+  }
+}
+
 const gitignore = gitignorePatterns();
 // Files not covered by tsconfig (which only includes src/), type-checked via
 // the default project so strictTypeChecked rules still apply to them.

From 93df4303fb3ffb73244c1819661c91a87c8d812a Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 23:07:34 +0500
Subject: [PATCH 10/43] feat(autocomplete): dedicated output channel for
 completions diagnostics

New 'OpenCode Completions' output channel logs every attempt (model,
context sizes, key presence, per-request duration/text) so testers can
see exactly what the provider is doing when suggestions don't appear.
---
 src/autocomplete/index.ts | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/autocomplete/index.ts b/src/autocomplete/index.ts
index 6e92d87..1e043db 100644
--- a/src/autocomplete/index.ts
+++ b/src/autocomplete/index.ts
@@ -25,17 +25,27 @@ export interface InlineCompletionsDeps {
 }
 
 export function registerInlineCompletions(context: vscode.ExtensionContext, deps: InlineCompletionsDeps): vscode.Disposable {
+  const output = vscode.window.createOutputChannel("OpenCode Completions");
+  context.subscriptions.push(output);
+  const log = (msg: string): void => {
+    output.appendLine(msg);
+  };
+
   const engine: CompletionEngine = {
     id: "chat-completions",
     async complete(ctx: CompletionContext, signal: AbortSignal): Promise<CompletionResult> {
       const apiKey = await deps.resolveApiKey();
       if (!apiKey) {
+        log("[completions] no API key — skipping");
         return { text: undefined, durationMs: 0 };
       }
+      log(`[completions] model=${ctx.modelId} prefixChars=${String(ctx.prefix.length)} suffixChars=${String(ctx.suffix.length)}`);
       const keyed = new ChatCompletionEngine({
         chatCompletionsUrl: deps.chatCompletionsUrl,
         apiKey,
-        log: deps.log,
+        log: (msg) => {
+          log(msg);
+        },
       });
       return keyed.complete(ctx, signal);
     },

From ab093f5526ac7464041e8ab38423f7d605ecfe22 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 23:14:49 +0500
Subject: [PATCH 11/43] fix(package): stop excluding out/autocomplete from the
 VSIX
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

.vscodeignore still carried 'out/autocomplete/**' from when the old
autocomplete feature was removed — the new inline-completions module lives
in the same directory, so the packaged extension.js required a missing
module and activation threw, hiding the status bar and disabling
suggestions. Remove the stale exclusion.
---
 .vscodeignore | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.vscodeignore b/.vscodeignore
index 43a7fc6..ebd4998 100644
--- a/.vscodeignore
+++ b/.vscodeignore
@@ -15,7 +15,6 @@ node_modules/**
 !node_modules/@silvia-odwyer/photon-node/*.js
 !node_modules/@silvia-odwyer/photon-node/*.wasm
 out/**/*.js.map
-out/autocomplete/**
 out/test/**
 scripts/**
 src/**

From d912b1bc192f303c2a1992887c35ba1e9fe26d09 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Wed, 12 Aug 2026 23:25:44 +0500
Subject: [PATCH 12/43] feat(autocomplete): model dropdown instead of a
 free-form input

opencodego.inlineSuggestionsModel is now an enum with descriptions:
qwen3.5-plus (verified fastest), qwen3.6-plus, qwen3.7-plus, and
deepseek-v4-flash (works, but measurably slower).
---
 package.json | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index fd66bc4..13be9a0 100644
--- a/package.json
+++ b/package.json
@@ -226,8 +226,20 @@
         },
         "opencodego.inlineSuggestionsModel": {
           "type": "string",
+          "enum": [
+            "qwen3.5-plus",
+            "qwen3.6-plus",
+            "qwen3.7-plus",
+            "deepseek-v4-flash"
+          ],
+          "enumDescriptions": [
+            "Fastest verified option: enable_thinking=false yields ~1.5s with zero hidden reasoning.",
+            "Qwen3.6 hybrid — same non-thinking mode, slightly larger context budget.",
+            "Qwen3.7 hybrid — newest Qwen on OpenCode Go, same non-thinking behavior.",
+            "Works but measurably slower — burns hidden reasoning tokens even with thinking off (~2s+)."
+          ],
           "default": "qwen3.5-plus",
-          "markdownDescription": "Model used for inline code suggestions. Prefer non-thinking models — measured: `qwen3.5-plus` with `enable_thinking=false` returns in ~1.5s with zero hidden reasoning, while reasoning models (e.g. `deepseek-v4-flash`) burn 100+ reasoning tokens even with thinking off and take 2s+."
+          "markdownDescription": "Model used for inline code suggestions. Prefer the non-thinking Qwen options — measured: `qwen3.5-plus` with `enable_thinking=false` returns in ~1.5s with zero hidden reasoning, while reasoning models (e.g. `deepseek-v4-flash`) burn 100+ reasoning tokens even with thinking off."
         },
         "opencodego.stripThinkTags": {
           "type": "string",

From 0e9ea30b008789d967d022a649dcc230dd7cc8fa Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 07:43:42 +0500
Subject: [PATCH 13/43] feat(autocomplete): make timing/size knobs
 config-driven

The provider and engine now read five tunables from the extension config
at runtime instead of hardcoding them: debounce ms, request timeout ms,
max tokens, prefix lines and suffix chars. Defaults unchanged (300 / 3000
/ 128 / 10 / 300); the output channel log already reports context sizes,
so the knobs are directly observable.
---
 src/autocomplete/index.ts    | 24 +++++++++++++++++++++---
 src/autocomplete/provider.ts | 33 +++++++++++++++++++++++++--------
 2 files changed, 46 insertions(+), 11 deletions(-)

diff --git a/src/autocomplete/index.ts b/src/autocomplete/index.ts
index 1e043db..fd8cbb8 100644
--- a/src/autocomplete/index.ts
+++ b/src/autocomplete/index.ts
@@ -14,7 +14,17 @@ import type { CompletionContext, CompletionEngine, CompletionResult } from "./ty
 
 export const INLINE_SUGGESTIONS_SETTING = "inlineSuggestions";
 export const INLINE_SUGGESTIONS_MODEL_SETTING = "inlineSuggestionsModel";
+export const INLINE_DEBOUNCE_MS_SETTING = "inlineSuggestionsDebounceMs";
+export const INLINE_TIMEOUT_MS_SETTING = "inlineSuggestionsTimeoutMs";
+export const INLINE_MAX_TOKENS_SETTING = "inlineSuggestionsMaxTokens";
+export const INLINE_PREFIX_LINES_SETTING = "inlineSuggestionsPrefixLines";
+export const INLINE_SUFFIX_CHARS_SETTING = "inlineSuggestionsSuffixChars";
 export const DEFAULT_INLINE_MODEL = "qwen3.5-plus";
+export const DEFAULT_INLINE_DEBOUNCE_MS = 300;
+export const DEFAULT_INLINE_TIMEOUT_MS = 3_000;
+export const DEFAULT_INLINE_MAX_TOKENS = 128;
+export const DEFAULT_INLINE_PREFIX_LINES = 10;
+export const DEFAULT_INLINE_SUFFIX_CHARS = 300;
 
 export interface InlineCompletionsDeps {
   /** Gateway chat-completions URL (Go). */
@@ -24,6 +34,10 @@ export interface InlineCompletionsDeps {
   log?: (msg: string) => void;
 }
 
+function readSetting<T>(key: string, fallback: T): T {
+  return vscode.workspace.getConfiguration("opencodego").get<T>(key, fallback);
+}
+
 export function registerInlineCompletions(context: vscode.ExtensionContext, deps: InlineCompletionsDeps): vscode.Disposable {
   const output = vscode.window.createOutputChannel("OpenCode Completions");
   context.subscriptions.push(output);
@@ -43,6 +57,7 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
       const keyed = new ChatCompletionEngine({
         chatCompletionsUrl: deps.chatCompletionsUrl,
         apiKey,
+        timeoutMs: readSetting(INLINE_TIMEOUT_MS_SETTING, DEFAULT_INLINE_TIMEOUT_MS),
         log: (msg) => {
           log(msg);
         },
@@ -54,9 +69,12 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
   const provider = new OpenCodeInlineCompletionProvider({
     engine,
     resolveApiKey: deps.resolveApiKey,
-    isEnabled: () => vscode.workspace.getConfiguration("opencodego").get<boolean>(INLINE_SUGGESTIONS_SETTING, false),
-    resolveModelId: () =>
-      vscode.workspace.getConfiguration("opencodego").get<string>(INLINE_SUGGESTIONS_MODEL_SETTING, DEFAULT_INLINE_MODEL) || "",
+    isEnabled: () => readSetting(INLINE_SUGGESTIONS_SETTING, false),
+    resolveModelId: () => readSetting(INLINE_SUGGESTIONS_MODEL_SETTING, DEFAULT_INLINE_MODEL),
+    resolveDebounceMs: () => readSetting(INLINE_DEBOUNCE_MS_SETTING, DEFAULT_INLINE_DEBOUNCE_MS),
+    resolveMaxTokens: () => readSetting(INLINE_MAX_TOKENS_SETTING, DEFAULT_INLINE_MAX_TOKENS),
+    resolvePrefixLines: () => readSetting(INLINE_PREFIX_LINES_SETTING, DEFAULT_INLINE_PREFIX_LINES),
+    resolveSuffixChars: () => readSetting(INLINE_SUFFIX_CHARS_SETTING, DEFAULT_INLINE_SUFFIX_CHARS),
   });
 
   const registration = vscode.languages.registerInlineCompletionItemProvider({ pattern: "**" }, provider);
diff --git a/src/autocomplete/provider.ts b/src/autocomplete/provider.ts
index 888292a..bd766a9 100644
--- a/src/autocomplete/provider.ts
+++ b/src/autocomplete/provider.ts
@@ -7,11 +7,9 @@
  */
 
 import * as vscode from "vscode";
-import { buildCompletionWindow, DEFAULT_MAX_TOKENS } from "./context";
+import { buildCompletionWindow } from "./context";
 import { Debouncer } from "./throttle";
-import type { CompletionEngine } from "./types";
-
-export const COMPLETION_DEBOUNCE_MS = 300;
+import type { CompletionContext, CompletionEngine } from "./types";
 
 export interface InlineCompletionProviderOptions {
   engine: CompletionEngine;
@@ -21,12 +19,22 @@ export interface InlineCompletionProviderOptions {
   isEnabled: () => boolean;
   /** The model to use for suggestions (config-driven). */
   resolveModelId: () => string;
+  /** Debounce delay in ms before a request is sent (config-driven). */
+  resolveDebounceMs: () => number;
+  /** Max tokens a completion may produce (config-driven). */
+  resolveMaxTokens: () => number;
+  /** Context window: lines before the cursor (config-driven). */
+  resolvePrefixLines: () => number;
+  /** Context window: chars after the cursor (config-driven). */
+  resolveSuffixChars: () => number;
 }
 
 export class OpenCodeInlineCompletionProvider implements vscode.InlineCompletionItemProvider {
-  private readonly debouncer = new Debouncer(COMPLETION_DEBOUNCE_MS);
+  private readonly debouncer: Debouncer;
 
-  constructor(private readonly options: InlineCompletionProviderOptions) {}
+  constructor(private readonly options: InlineCompletionProviderOptions) {
+    this.debouncer = new Debouncer(options.resolveDebounceMs());
+  }
 
   provideInlineCompletionItems(
     document: vscode.TextDocument,
@@ -40,7 +48,10 @@ export class OpenCodeInlineCompletionProvider implements vscode.InlineCompletion
 
     const text = document.getText();
     const offset = document.offsetAt(position);
-    const { prefix, suffix } = buildCompletionWindow(text, offset);
+    const { prefix, suffix } = buildCompletionWindow(text, offset, {
+      prefixLines: this.options.resolvePrefixLines(),
+      suffixChars: this.options.resolveSuffixChars(),
+    });
     if (!prefix.trim()) {
       return Promise.resolve(undefined);
     }
@@ -74,7 +85,13 @@ export class OpenCodeInlineCompletionProvider implements vscode.InlineCompletion
           finish(undefined);
           return;
         }
-        const result = await this.options.engine.complete({ prefix, suffix, modelId, maxTokens: DEFAULT_MAX_TOKENS }, signal);
+        const ctx: CompletionContext = {
+          prefix,
+          suffix,
+          modelId,
+          maxTokens: this.options.resolveMaxTokens(),
+        };
+        const result = await this.options.engine.complete(ctx, signal);
         if (!result.text) {
           finish(undefined);
           return;

From 29ddb12743d414328a9fcb35312f41aa5867cca5 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 07:44:05 +0500
Subject: [PATCH 14/43] feat(settings): expose the five inline-suggestion knobs

New settings with sensible bounds and descriptions:
inlineSuggestionsDebounceMs (50-2000), inlineSuggestionsTimeoutMs
(500-15000), inlineSuggestionsMaxTokens (16-1024),
inlineSuggestionsPrefixLines (1-100), inlineSuggestionsSuffixChars
(0-5000).
---
 package.json | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/package.json b/package.json
index 175de3a..b02bc66 100644
--- a/package.json
+++ b/package.json
@@ -241,6 +241,41 @@
           "default": "qwen3.5-plus",
           "markdownDescription": "Model used for inline code suggestions. Prefer the non-thinking Qwen options — measured: `qwen3.5-plus` with `enable_thinking=false` returns in ~1.5s with zero hidden reasoning, while reasoning models (e.g. `deepseek-v4-flash`) burn 100+ reasoning tokens even with thinking off."
         },
+        "opencodego.inlineSuggestionsDebounceMs": {
+          "type": "number",
+          "default": 300,
+          "minimum": 50,
+          "maximum": 2000,
+          "markdownDescription": "Delay after the last keystroke before an inline suggestion is requested. Lower = snappier but more requests; higher = fewer requests but slower appearance."
+        },
+        "opencodego.inlineSuggestionsTimeoutMs": {
+          "type": "number",
+          "default": 3000,
+          "minimum": 500,
+          "maximum": 15000,
+          "markdownDescription": "Maximum time an inline suggestion request may take before it is abandoned (the ghost text then simply doesn't appear)."
+        },
+        "opencodego.inlineSuggestionsMaxTokens": {
+          "type": "number",
+          "default": 128,
+          "minimum": 16,
+          "maximum": 1024,
+          "markdownDescription": "Maximum tokens a completion may produce. Shorter = faster; longer = more complete suggestions."
+        },
+        "opencodego.inlineSuggestionsPrefixLines": {
+          "type": "number",
+          "default": 10,
+          "minimum": 1,
+          "maximum": 100,
+          "markdownDescription": "Context window: how many lines before the cursor are sent with each suggestion request. More context = better completions, slightly slower."
+        },
+        "opencodego.inlineSuggestionsSuffixChars": {
+          "type": "number",
+          "default": 300,
+          "minimum": 0,
+          "maximum": 5000,
+          "markdownDescription": "Context window: how many characters after the cursor are sent with each suggestion request (0 disables the suffix)."
+        },
         "opencodego.stripThinkTags": {
           "type": "string",
           "enum": [

From 93b09c34bac928f3063ee2f4161a1900ac712adc Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 07:46:15 +0500
Subject: [PATCH 15/43] test(autocomplete): cover configurable debounce and
 window knobs

Custom debounce delay (runs after the delay, not before), custom
prefix/suffix window sizes (exactly prefixLines lines), and zero suffix
chars disabling the suffix (207 tests).
---
 src/test/autocomplete.test.ts | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/test/autocomplete.test.ts b/src/test/autocomplete.test.ts
index 8b88851..6bed588 100644
--- a/src/test/autocomplete.test.ts
+++ b/src/test/autocomplete.test.ts
@@ -60,6 +60,19 @@ describe("autocomplete — buildCompletionWindow", () => {
     void DEFAULT_PREFIX_LINES;
     void DEFAULT_SUFFIX_CHARS;
   });
+
+  it("honors custom prefix/suffix window options", () => {
+    const doc = Array.from({ length: 20 }, (_, i) => `line ${i}`).join("\n");
+    const w = buildCompletionWindow(doc, doc.length, { prefixLines: 2, suffixChars: 0 });
+    assert.equal(w.prefix.split("\n").length, 2, "exactly prefixLines lines, including the cursor line");
+    assert.equal(w.suffix, "");
+  });
+
+  it("zero suffix chars disables the suffix entirely", () => {
+    const w = buildCompletionWindow("abc\nrest", 1, { suffixChars: 0 });
+    assert.equal(w.prefix, "a");
+    assert.equal(w.suffix, "");
+  });
 });
 
 describe("autocomplete — engine parsing", () => {
@@ -84,6 +97,19 @@ describe("autocomplete — engine parsing", () => {
 });
 
 describe("autocomplete — Debouncer", () => {
+  it("honors a custom delay", async () => {
+    const d = new Debouncer(120);
+    let runs = 0;
+    d.debounce(() => {
+      runs += 1;
+    });
+    await new Promise((r) => setTimeout(r, 60));
+    assert.equal(runs, 0, "should not run before the custom delay elapses");
+    await new Promise((r) => setTimeout(r, 90));
+    assert.equal(runs, 1);
+    d.dispose();
+  });
+
   it("debounces and only runs after the delay", async () => {
     const d = new Debouncer(50);
     let runs = 0;

From 9f7a5343cc1cd31b11661c688da9dad2446d78ad Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 07:47:01 +0500
Subject: [PATCH 16/43] docs(autocomplete): document the five tuning knobs

---
 CHANGELOG.md | 2 +-
 README.md    | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae8ad9c..a678f89 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Added
 
-- **`[Autocomplete]` Inline code suggestions (experimental, #49).** Ghost-text completions while typing, powered by the OpenCode gateway with thinking forced off. Opt-in via `opencodego.inlineSuggestions` (default `false`); model via `opencodego.inlineSuggestionsModel` (default `qwen3.5-plus`, whose `enable_thinking=false` mode is a genuine no-reasoning path — measured ~1.5s time-to-first-token with zero hidden reasoning). Requests are tiny (10 lines before the cursor + a short suffix), debounced 300ms, time out at 3s and abort on the next keystroke. The gateway exposes no FIM endpoint, so completions emulate fill-in-the-middle with FIM tokens over `/chat/completions`. New `src/autocomplete/` module (context, prompt, throttle, engine, provider, registration) with unit tests; `scripts/probe-completion-latency.ts` measures engine latency live.
+- **`[Autocomplete]` Inline code suggestions (experimental, #49).** Ghost-text completions while typing, powered by the OpenCode gateway with thinking forced off. Opt-in via `opencodego.inlineSuggestions` (default `false`); model via `opencodego.inlineSuggestionsModel` (default `qwen3.5-plus`, whose `enable_thinking=false` mode is a genuine no-reasoning path — measured ~1.5s time-to-first-token with zero hidden reasoning). Requests are tiny (10 lines before the cursor + a short suffix), debounced 300ms, time out at 3s and abort on the next keystroke. The gateway exposes no FIM endpoint, so completions emulate fill-in-the-middle with FIM tokens over `/chat/completions`. New `src/autocomplete/` module (context, prompt, throttle, engine, provider, registration) with unit tests; `scripts/probe-completion-latency.ts` measures engine latency live. All timing/size knobs are user-tunable: `inlineSuggestionsDebounceMs`, `inlineSuggestionsTimeoutMs`, `inlineSuggestionsMaxTokens`, `inlineSuggestionsPrefixLines`, `inlineSuggestionsSuffixChars`.
 - **`[Usage]` Server-accurate Go meters via the official `/zen/go/v1/usage` endpoint (#130).** The status bar, tooltip, quick-pick and usage webview previously showed locally estimated Session/Weekly/Monthly percentages that drifted from opencode.ai (issue #23) because they missed CLI, cross-device and pre-install usage. The tracker now pulls the official endpoint (upstream anomalyco/opencode#16513, verified live) with the existing Go key on startup and after each request (60s TTL cache): rolling/weekly/monthly percent + reset times are server-computed and account-wide, `spent` is derived from the authoritative percent, and Today/Yesterday + per-session spend stay device-local. Failures (401/403/404/network) fall back to the existing SQLite → tracked estimates. The key is only ever sent as the Authorization header and never logged or persisted. New pure module `src/goUsageSync.ts` with unit tests. Documented in `docs/issues/62-20260812-pr132-go-usage-server-sync.md`. PR [#132](https://github.com/ltmoerdani/opencode-copilot-chat/pull/132) by [@Fahad090NP](https://github.com/Fahad090NP).
 
 ### Changed
diff --git a/README.md b/README.md
index 7749367..486b8a3 100644
--- a/README.md
+++ b/README.md
@@ -354,7 +354,8 @@ Ghost-text completions while typing, powered by the OpenCode gateway with **thin
 
 - Opt-in: `"opencodego.inlineSuggestions": true` (requires a window reload).
 - Model: `opencodego.inlineSuggestionsModel` — defaults to `qwen3.5-plus`, whose `enable_thinking=false` mode is a genuine no-reasoning path (measured ~1.5s TTFB, zero hidden reasoning). Reasoning models (e.g. `deepseek-v4-flash`) burn 100+ reasoning tokens even with thinking off and are not recommended.
-- Requests are tiny (10 lines before the cursor + a short suffix), debounced 300ms, time out at 3s, and are aborted on the next keystroke.
+- Tuning knobs (all optional): `inlineSuggestionsDebounceMs` (300), `inlineSuggestionsTimeoutMs` (3000), `inlineSuggestionsMaxTokens` (128), `inlineSuggestionsPrefixLines` (10), `inlineSuggestionsSuffixChars` (300).
+- Requests are tiny (10 lines before the cursor + a short suffix by default), debounced 300ms, time out at 3s, and are aborted on the next keystroke.
 - The gateway exposes no FIM endpoint, so completions use fill-in-the-middle emulation with FIM tokens over `/chat/completions`.
 
 ### 🛠️ Smart Routing & Reliability

From be933832a07a70d9f2f48f8bef2fdb6dd1be1bee Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 08:49:41 +0500
Subject: [PATCH 17/43] refactor(config): centralize all tunable constants in
 src/config.ts

Every URL, timeout, limit, storage key, setting key and default now lives in
one dependency-free module. Existing modules import from it and re-export the
names their callers/tests rely on, so no consumer changed. Also introduced
src/utils.ts with the shared primitives that were copy-pasted across modules:
isRecord (6 copies), firstString, compactErrorCode, positiveNumber,
getErrorMessage, formatUsd, formatTokenCount, formatRelativeTime, escapeHtml,
cancellable sleep/sleepWithCancellation.

Behavior-preserving cleanups included:
- sanitizeToolSchema: removed the useless ternary where both branches were 'object'
- AnthropicResponseExtractor no longer mutates the extractor instance as if it
  were the usage summary (the real summary is already updated by onData)
- formatModalityBadges: collapsed two identical Audio branches
- isFreeModel/isFreeZenModel/parseToolInput/dataPartToBase64 deduplicated
- buildVisionRequestMessage + buildWholeConversationRequest unified
- VISION_CAPABLE_MODELS duplicate entries removed
- inline-completion debounce re-read live so config changes apply per keystroke
- config numeric settings sanitized (strings can no longer reach request bodies)
- dead code removed: getOrCreateProfile, formatGoUsageTooltip,
  formatGoUsageLanguageStatusDetail, createUsageDataPart
---
 src/autocomplete/context.ts  |  14 +-
 src/autocomplete/engine.ts   |   3 +-
 src/autocomplete/index.ts    |  62 ++++--
 src/autocomplete/provider.ts |   7 +
 src/autocomplete/throttle.ts |   7 +-
 src/chatParts.ts             |   4 -
 src/config.ts                | 228 ++++++++++++++++++++
 src/extension.ts             | 402 +++++++++++++----------------------
 src/goUsageSync.ts           |   8 +-
 src/goUsageTracker.ts        | 144 +++----------
 src/imageNormalizer.ts       |   5 +-
 src/metadata.ts              |  31 +--
 src/modelLimits.ts           |   5 +-
 src/retry.ts                 |  27 +--
 src/streaming.ts             |  42 +---
 src/usage.ts                 |  16 +-
 src/usageProfile.ts          |  30 +--
 src/utils.ts                 | 163 ++++++++++++++
 src/visionProxyCache.ts      |   6 +-
 19 files changed, 675 insertions(+), 529 deletions(-)
 create mode 100644 src/config.ts
 create mode 100644 src/utils.ts

diff --git a/src/autocomplete/context.ts b/src/autocomplete/context.ts
index 06f9295..292671a 100644
--- a/src/autocomplete/context.ts
+++ b/src/autocomplete/context.ts
@@ -7,9 +7,13 @@
  * Pure and unit-tested.
  */
 
-export const DEFAULT_PREFIX_LINES = 10;
-export const DEFAULT_SUFFIX_CHARS = 300;
-export const DEFAULT_MAX_TOKENS = 128;
+import { DEFAULT_INLINE_PREFIX_LINES, DEFAULT_INLINE_SUFFIX_CHARS } from "../config";
+
+export {
+  DEFAULT_INLINE_PREFIX_LINES as DEFAULT_PREFIX_LINES,
+  DEFAULT_INLINE_SUFFIX_CHARS as DEFAULT_SUFFIX_CHARS,
+  DEFAULT_INLINE_MAX_TOKENS as DEFAULT_MAX_TOKENS,
+} from "../config";
 
 export interface CompletionWindowOptions {
   prefixLines?: number;
@@ -22,8 +26,8 @@ export interface CompletionWindow {
 }
 
 export function buildCompletionWindow(text: string, offset: number, options: CompletionWindowOptions = {}): CompletionWindow {
-  const prefixLines = options.prefixLines ?? DEFAULT_PREFIX_LINES;
-  const suffixChars = options.suffixChars ?? DEFAULT_SUFFIX_CHARS;
+  const prefixLines = options.prefixLines ?? DEFAULT_INLINE_PREFIX_LINES;
+  const suffixChars = options.suffixChars ?? DEFAULT_INLINE_SUFFIX_CHARS;
 
   const prefixStart = Math.max(0, offset - 1);
   const beforeCursor = text.slice(0, prefixStart + 1);
diff --git a/src/autocomplete/engine.ts b/src/autocomplete/engine.ts
index d6d619f..0417292 100644
--- a/src/autocomplete/engine.ts
+++ b/src/autocomplete/engine.ts
@@ -9,8 +9,9 @@
 
 import { buildCompletionPrompt } from "./prompt";
 import type { CompletionContext, CompletionEngine, CompletionResult } from "./types";
+import { COMPLETION_REQUEST_TIMEOUT_MS } from "../config";
 
-export const COMPLETION_REQUEST_TIMEOUT_MS = 3_000;
+export { COMPLETION_REQUEST_TIMEOUT_MS } from "../config";
 
 export interface ChatCompletionEngineOptions {
   /** Gateway chat-completions URL (provider-specific). */
diff --git a/src/autocomplete/index.ts b/src/autocomplete/index.ts
index fd8cbb8..78ddd5f 100644
--- a/src/autocomplete/index.ts
+++ b/src/autocomplete/index.ts
@@ -11,20 +11,39 @@ import * as vscode from "vscode";
 import { ChatCompletionEngine } from "./engine";
 import { OpenCodeInlineCompletionProvider } from "./provider";
 import type { CompletionContext, CompletionEngine, CompletionResult } from "./types";
+import {
+  CONFIG_SECTION,
+  DEFAULT_INLINE_DEBOUNCE_MS,
+  DEFAULT_INLINE_MAX_TOKENS,
+  DEFAULT_INLINE_MODEL,
+  DEFAULT_INLINE_PREFIX_LINES,
+  DEFAULT_INLINE_SUFFIX_CHARS,
+  DEFAULT_INLINE_TIMEOUT_MS,
+  INLINE_DEBOUNCE_MS_SETTING,
+  INLINE_MAX_TOKENS_SETTING,
+  INLINE_PREFIX_LINES_SETTING,
+  INLINE_SUGGESTIONS_MODEL_SETTING,
+  INLINE_SUGGESTIONS_SETTING,
+  INLINE_SUFFIX_CHARS_SETTING,
+  INLINE_TIMEOUT_MS_SETTING,
+} from "../config";
+import { toFiniteNumber } from "../utils";
 
-export const INLINE_SUGGESTIONS_SETTING = "inlineSuggestions";
-export const INLINE_SUGGESTIONS_MODEL_SETTING = "inlineSuggestionsModel";
-export const INLINE_DEBOUNCE_MS_SETTING = "inlineSuggestionsDebounceMs";
-export const INLINE_TIMEOUT_MS_SETTING = "inlineSuggestionsTimeoutMs";
-export const INLINE_MAX_TOKENS_SETTING = "inlineSuggestionsMaxTokens";
-export const INLINE_PREFIX_LINES_SETTING = "inlineSuggestionsPrefixLines";
-export const INLINE_SUFFIX_CHARS_SETTING = "inlineSuggestionsSuffixChars";
-export const DEFAULT_INLINE_MODEL = "qwen3.5-plus";
-export const DEFAULT_INLINE_DEBOUNCE_MS = 300;
-export const DEFAULT_INLINE_TIMEOUT_MS = 3_000;
-export const DEFAULT_INLINE_MAX_TOKENS = 128;
-export const DEFAULT_INLINE_PREFIX_LINES = 10;
-export const DEFAULT_INLINE_SUFFIX_CHARS = 300;
+export {
+  INLINE_SUGGESTIONS_SETTING,
+  INLINE_SUGGESTIONS_MODEL_SETTING,
+  INLINE_DEBOUNCE_MS_SETTING,
+  INLINE_TIMEOUT_MS_SETTING,
+  INLINE_MAX_TOKENS_SETTING,
+  INLINE_PREFIX_LINES_SETTING,
+  INLINE_SUFFIX_CHARS_SETTING,
+  DEFAULT_INLINE_MODEL,
+  DEFAULT_INLINE_DEBOUNCE_MS,
+  DEFAULT_INLINE_TIMEOUT_MS,
+  DEFAULT_INLINE_MAX_TOKENS,
+  DEFAULT_INLINE_PREFIX_LINES,
+  DEFAULT_INLINE_SUFFIX_CHARS,
+} from "../config";
 
 export interface InlineCompletionsDeps {
   /** Gateway chat-completions URL (Go). */
@@ -35,7 +54,12 @@ export interface InlineCompletionsDeps {
 }
 
 function readSetting<T>(key: string, fallback: T): T {
-  return vscode.workspace.getConfiguration("opencodego").get<T>(key, fallback);
+  return vscode.workspace.getConfiguration(CONFIG_SECTION).get<T>(key, fallback);
+}
+
+/** Read a numeric setting, clamped to a sane range (guards against bad config values). */
+function readNumberSetting(key: string, fallback: number, min: number, max: number): number {
+  return toFiniteNumber(readSetting(key, fallback), fallback, min, max);
 }
 
 export function registerInlineCompletions(context: vscode.ExtensionContext, deps: InlineCompletionsDeps): vscode.Disposable {
@@ -57,7 +81,7 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
       const keyed = new ChatCompletionEngine({
         chatCompletionsUrl: deps.chatCompletionsUrl,
         apiKey,
-        timeoutMs: readSetting(INLINE_TIMEOUT_MS_SETTING, DEFAULT_INLINE_TIMEOUT_MS),
+        timeoutMs: readNumberSetting(INLINE_TIMEOUT_MS_SETTING, DEFAULT_INLINE_TIMEOUT_MS, 500, 15_000),
         log: (msg) => {
           log(msg);
         },
@@ -71,10 +95,10 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
     resolveApiKey: deps.resolveApiKey,
     isEnabled: () => readSetting(INLINE_SUGGESTIONS_SETTING, false),
     resolveModelId: () => readSetting(INLINE_SUGGESTIONS_MODEL_SETTING, DEFAULT_INLINE_MODEL),
-    resolveDebounceMs: () => readSetting(INLINE_DEBOUNCE_MS_SETTING, DEFAULT_INLINE_DEBOUNCE_MS),
-    resolveMaxTokens: () => readSetting(INLINE_MAX_TOKENS_SETTING, DEFAULT_INLINE_MAX_TOKENS),
-    resolvePrefixLines: () => readSetting(INLINE_PREFIX_LINES_SETTING, DEFAULT_INLINE_PREFIX_LINES),
-    resolveSuffixChars: () => readSetting(INLINE_SUFFIX_CHARS_SETTING, DEFAULT_INLINE_SUFFIX_CHARS),
+    resolveDebounceMs: () => readNumberSetting(INLINE_DEBOUNCE_MS_SETTING, DEFAULT_INLINE_DEBOUNCE_MS, 50, 2_000),
+    resolveMaxTokens: () => readNumberSetting(INLINE_MAX_TOKENS_SETTING, DEFAULT_INLINE_MAX_TOKENS, 16, 1_024),
+    resolvePrefixLines: () => readNumberSetting(INLINE_PREFIX_LINES_SETTING, DEFAULT_INLINE_PREFIX_LINES, 1, 100),
+    resolveSuffixChars: () => readNumberSetting(INLINE_SUFFIX_CHARS_SETTING, DEFAULT_INLINE_SUFFIX_CHARS, 0, 5_000),
   });
 
   const registration = vscode.languages.registerInlineCompletionItemProvider({ pattern: "**" }, provider);
diff --git a/src/autocomplete/provider.ts b/src/autocomplete/provider.ts
index bd766a9..a534c5a 100644
--- a/src/autocomplete/provider.ts
+++ b/src/autocomplete/provider.ts
@@ -46,6 +46,13 @@ export class OpenCodeInlineCompletionProvider implements vscode.InlineCompletion
       return Promise.resolve(undefined);
     }
 
+    // Keep the debounce window live: a config change applies on the next
+    // keystroke instead of requiring the provider to be recreated.
+    const debounceMs = this.options.resolveDebounceMs();
+    if (debounceMs !== this.debouncer.delayMs) {
+      this.debouncer.delayMs = debounceMs;
+    }
+
     const text = document.getText();
     const offset = document.offsetAt(position);
     const { prefix, suffix } = buildCompletionWindow(text, offset, {
diff --git a/src/autocomplete/throttle.ts b/src/autocomplete/throttle.ts
index ef42cc7..f73f55d 100644
--- a/src/autocomplete/throttle.ts
+++ b/src/autocomplete/throttle.ts
@@ -9,7 +9,12 @@ export class Debouncer {
   private timer: ReturnType<typeof setTimeout> | undefined;
   private controller: AbortController | undefined;
 
-  constructor(private readonly delayMs: number) {}
+  /** Current debounce window; may be updated at runtime (config-driven). */
+  delayMs: number;
+
+  constructor(delayMs: number) {
+    this.delayMs = delayMs;
+  }
 
   /**
    * Schedule `run` after the debounce window. A previous scheduled run is
diff --git a/src/chatParts.ts b/src/chatParts.ts
index 6bf277c..b3c402b 100644
--- a/src/chatParts.ts
+++ b/src/chatParts.ts
@@ -5,10 +5,6 @@ export const OPENCODE_USAGE_DATA_MIME = "application/vnd.opencode.usage+json";
 export const COPILOT_USAGE_DATA_MIME = "usage";
 export const OPENCODE_REASONING_DATA_MIME = "application/vnd.opencode.reasoning+json";
 
-export function createUsageDataPart(usage: UsageSnapshot): vscode.LanguageModelDataPart | undefined {
-  return createUsageDataParts(usage)[0];
-}
-
 export function createUsageDataParts(usage: UsageSnapshot): vscode.LanguageModelDataPart[] {
   if (!hasUsageSnapshot(usage)) {
     return [];
diff --git a/src/config.ts b/src/config.ts
new file mode 100644
index 0000000..28c3aac
--- /dev/null
+++ b/src/config.ts
@@ -0,0 +1,228 @@
+/**
+ * Central configuration for the extension.
+ *
+ * Every tunable value / limit / URL / storage key / default lives here so it
+ * can be changed in ONE place without hunting through the codebase. Modules
+ * import from this file; where an existing module historically exported a
+ * constant (and tests or callers rely on it), the module re-exports it:
+ *
+ *   import { X } from "./config";
+ *   export { X } from "./config";
+ *
+ * CONTRACT: this file must stay dependency-free (no imports) so any module
+ * can import from it without creating import cycles.
+ */
+
+// ─── Extension identity ──────────────────────────────────────────────────────
+
+/** VS Code extension ID (used for `extensions.supportAgentsWindow.<id>`). */
+export const EXTENSION_ID = "ltmoerdani.opencode-copilot-chat";
+/** SecretStorage key for the API key. */
+export const SECRET_KEY = "opencodego.apiKey";
+/** Client name sent in the `x-opencode-client` header. */
+export const OPEN_CODE_CLIENT = "vscode-copilot-chat";
+/** Fallback only — overridden at runtime from packageJSON.version. */
+export const FALLBACK_USER_AGENT = "opencode-copilot-chat/0.5.2 VSCode";
+/** Configuration section under which all extension settings live. */
+export const CONFIG_SECTION = "opencodego";
+
+// ─── Configuration setting keys ──────────────────────────────────────────────
+
+export const SETTING_ENABLED = "enabled";
+export const SETTING_FREE_ONLY = "freeOnly";
+export const SETTING_AGENTS_WINDOW = "agentsWindow";
+export const SETTING_AUTO_ENABLE_AGENTS_WINDOW = "autoEnableAgentsWindow";
+export const SETTING_SHOW_USAGE_STATUS_BAR = "showUsageStatusBar";
+export const SETTING_SHOW_PROVIDER_PREFIX = "showProviderPrefix";
+export const SETTING_TEMPERATURE = "temperature";
+export const SETTING_MAX_TOKENS = "maxTokens";
+export const SETTING_MAX_INPUT_TOKENS = "maxInputTokens";
+export const SETTING_DEBUG_REASONING = "debugReasoning";
+export const SETTING_REQUEST_TIMEOUT_SECONDS = "requestTimeoutSeconds";
+export const SETTING_STREAM_IDLE_TIMEOUT_SECONDS = "streamIdleTimeoutSeconds";
+export const SETTING_STRIP_THINK_TAGS = "stripThinkTags";
+export const SETTING_VISION_PROXY_WHOLE_CONVERSATION = "visionProxyWholeConversation";
+export const SETTING_THINKING = "thinking";
+export const SETTING_THINKING_DEEPSEEK = "thinking.deepseek";
+export const SETTING_THINKING_GLM = "thinking.glm";
+export const SETTING_THINKING_KIMI = "thinking.kimi";
+export const SETTING_THINKING_MINIMAX = "thinking.minimax";
+export const SETTING_THINKING_OPENAI = "thinking.openai";
+export const SETTING_THINKING_QWEN = "thinking.qwen";
+export const SETTING_THINKING_QWEN_BUDGET = "thinking.qwenBudget";
+export const SETTING_THINKING_MIMO = "thinking.mimo";
+
+// ─── Inline completions (issue #49) ─────────────────────────────────────────
+
+export const INLINE_SUGGESTIONS_SETTING = "inlineSuggestions";
+export const INLINE_SUGGESTIONS_MODEL_SETTING = "inlineSuggestionsModel";
+export const INLINE_DEBOUNCE_MS_SETTING = "inlineSuggestionsDebounceMs";
+export const INLINE_TIMEOUT_MS_SETTING = "inlineSuggestionsTimeoutMs";
+export const INLINE_MAX_TOKENS_SETTING = "inlineSuggestionsMaxTokens";
+export const INLINE_PREFIX_LINES_SETTING = "inlineSuggestionsPrefixLines";
+export const INLINE_SUFFIX_CHARS_SETTING = "inlineSuggestionsSuffixChars";
+export const DEFAULT_INLINE_MODEL = "qwen3.5-plus";
+export const DEFAULT_INLINE_DEBOUNCE_MS = 300;
+export const DEFAULT_INLINE_TIMEOUT_MS = 3_000;
+export const DEFAULT_INLINE_MAX_TOKENS = 128;
+export const DEFAULT_INLINE_PREFIX_LINES = 10;
+export const DEFAULT_INLINE_SUFFIX_CHARS = 300;
+
+// ─── Request timeouts (ms) ───────────────────────────────────────────────────
+
+export const DEFAULT_REQUEST_TIMEOUT_MS = 10 * 60 * 1000;
+export const DEFAULT_STREAM_IDLE_TIMEOUT_MS = 2 * 60 * 1000;
+export const DEFAULT_REQUEST_TIMEOUT_SECONDS = DEFAULT_REQUEST_TIMEOUT_MS / 1000;
+export const DEFAULT_STREAM_IDLE_TIMEOUT_SECONDS = DEFAULT_STREAM_IDLE_TIMEOUT_MS / 1000;
+/** Hard ceiling for a single model-list fetch (issue #78). */
+export const MODEL_LIST_FETCH_TIMEOUT_MS = 15_000;
+/** Hard timeout for the models.dev metadata refresh. */
+export const MODEL_METADATA_FETCH_TIMEOUT_MS = 10_000;
+/** Hard timeout for a single server-usage fetch. */
+export const GO_USAGE_FETCH_TIMEOUT_MS = 10_000;
+/** Timeout for the "Test Connection" probe request. */
+export const TEST_CONNECTION_TIMEOUT_MS = 30_000;
+/** Per-request timeout for the inline completion engine. */
+export const COMPLETION_REQUEST_TIMEOUT_MS = 3_000;
+
+// ─── Model-list fetch resilience (issue #78) ─────────────────────────────────
+
+/** Max retry attempts for transient network failures during model-list fetch. */
+export const MODEL_LIST_FETCH_MAX_RETRIES = 3;
+/** Base delay for exponential backoff (500ms, 1s, 2s). */
+export const MODEL_LIST_FETCH_RETRY_BASE_MS = 500;
+/** TTL for the last successful model-list snapshot cached in globalState. */
+export const MODEL_LIST_CACHE_TTL_MS = 60 * 60 * 1000;
+/** globalState key suffix per vendor; full key = `${base}::<vendor>`. */
+export const MODEL_LIST_CACHE_KEY_PREFIX = "opencode.modelListCache.v1";
+
+// ─── Model metadata (models.dev) ─────────────────────────────────────────────
+
+export const MODELS_DEV_API_URL = "https://models.dev/api.json";
+export const MODEL_METADATA_REVISION = "session-2026-05-21-b";
+export const MODEL_METADATA_CACHE_KEY = "opencode.modelMetadataCache.v5";
+export const MODEL_METADATA_CACHE_TTL_MS = 1 * 60 * 60 * 1000;
+export const DEFAULT_MODEL_CONTEXT_WINDOW = 262144;
+export const DEFAULT_MODEL_MAX_OUTPUT_TOKENS = 65536;
+
+// ─── Output budget / token-estimate margins ──────────────────────────────────
+
+/** Reserve for UI rendering so the advertised output never claims the full window. */
+export const UI_OUTPUT_TOKEN_RESERVE = 8192;
+export const MIN_TOKEN_ESTIMATE_SAFETY_MARGIN = 64;
+export const TOKEN_ESTIMATE_SAFETY_RATIO = 0.12;
+export const CONTEXT_RETRY_MIN_SAFETY_TOKENS = 256;
+export const CONTEXT_RETRY_SAFETY_RATIO = 0.001;
+
+// ─── Token-count overheads ───────────────────────────────────────────────────
+
+export const MESSAGE_TOKEN_OVERHEAD = 4;
+export const MESSAGE_NAME_TOKEN_OVERHEAD = 1;
+export const TOOL_CALL_TOKEN_OVERHEAD = 10;
+export const TOOL_RESULT_TOKEN_OVERHEAD = 6;
+export const IMAGE_TOKEN_ESTIMATE = 1024;
+
+// ─── Image payload limits ────────────────────────────────────────────────────
+
+/** Max raw bytes for a single image embedded in a tool result (issue #38). */
+export const MAX_TOOL_RESULT_IMAGE_BYTES = 1_000_000;
+/** Max images kept in conversation history before older ones are placeholder-replaced. */
+export const MAX_HISTORY_IMAGES_KEPT = 2;
+/** Hard ceiling (base64 chars) for a normalized image attachment. */
+export const MAX_IMAGE_BASE64_BYTES = 5 * 1024 * 1024;
+/** Dimension cap for normalized images. */
+export const MAX_IMAGE_WIDTH = 2_000;
+export const MAX_IMAGE_HEIGHT = 2_000;
+
+// ─── Go usage tracking ───────────────────────────────────────────────────────
+
+/** OpenCode Go subscription limits in USD (https://opencode.ai/docs/go). */
+export const GO_LIMITS = {
+  session: 12, // $12 per rolling 5-hour window
+  weekly: 30, // $30 per week (Mon–Mon UTC)
+  monthly: 60, // $60 per month (anchor-based)
+} as const;
+export const FIVE_HOURS_MS = 5 * 60 * 60 * 1000;
+export const WEEK_MS = 7 * 24 * 60 * 60 * 1000;
+export const GO_USAGE_API_URL = "https://opencode.ai/zen/go/v1/usage";
+/** How long a successful server-usage snapshot is reused before refetching. */
+export const GO_USAGE_SYNC_TTL_MS = 60_000;
+export const GO_USAGE_LOG_KEY = "opencodego.usageLog.v1";
+export const GO_USAGE_BASELINE_KEY = "opencodego.usageBaseline.v1";
+export const GO_EVER_TRACKED_KEY = "opencodego.everTracked.v1";
+export const GO_SESSION_COSTS_KEY = "opencodego.sessionCosts.v1";
+export const GO_MAX_LOG_ENTRIES = 2000;
+export const GO_SESSION_IDLE_MS = 2 * 60 * 60 * 1000;
+export const GO_MAX_SESSIONS = 50;
+
+// ─── Usage profiles (issue #63) ──────────────────────────────────────────────
+
+export const PROFILES_REGISTRY_KEY = "opencodego.profiles.v1";
+export const ACTIVE_PROFILE_KEY = "opencodego.activeProfile.v1";
+export const MIGRATED_KEY = "opencodego.migratedTo.v1";
+export const LEGACY_SECRET_KEY = SECRET_KEY;
+export const LEGACY_FINGERPRINT = "legacy";
+
+// ─── Diagnostics / caches ────────────────────────────────────────────────────
+
+export const RECENT_TRANSPORT_SUMMARY_LIMIT = 25;
+export const RECENT_TRANSPORT_SUMMARY_STORAGE_PREFIX = "opencode.recentTransportSummaries";
+/** Cap on the per-tool-call reasoning content cache. */
+export const REASONING_CACHE_LIMIT = 500;
+/** Cap on the vision-proxy image description cache. */
+export const IMAGE_DESCRIPTION_CACHE_LIMIT = 200;
+
+// ─── Agents window support (issue #122) ──────────────────────────────────────
+
+export const AGENT_HOST_BYOK_ENABLED_SETTING = "byokModels.enabled";
+export const SUPPORT_AGENTS_WINDOW_SETTING = "supportAgentsWindow";
+/** How many VS Code minor versions old the agent-host BYOK bridge goes back to. */
+export const AGENT_HOST_BYOK_MINOR_VERSION = 129;
+export const AGENTS_BYOK_BRIDGE_STATE_KEY = "opencode.agentsByokBridge.v1";
+export const SUPPORT_AGENTS_WINDOW_STATE_KEY = "opencode.supportAgentsWindow.v1";
+
+// ─── Vision proxy (issue #74) ────────────────────────────────────────────────
+
+export const VISION_PROXY_MODEL_ID_KEY = "opencodego.visionProxyModelId";
+export const VISION_PROXY_PROMPT_KEY = "opencodego.visionProxyPrompt";
+export const DEFAULT_VISION_PROXY_PROMPT =
+  "Describe this image in detail so a text-only model can understand what it shows. " +
+  "Include all visible text, layout, colors, objects, and context.";
+
+// ─── Transient 5xx retry (retry.ts) ──────────────────────────────────────────
+
+export const TRANSIENT_5XX_MAX_RETRIES = 2;
+export const TRANSIENT_5XX_RETRY_BASE_MS = 1000;
+export const TRANSIENT_5XX_RETRY_JITTER_MS = 250;
+
+// ─── Model classification ────────────────────────────────────────────────────
+
+/** Zen free-model IDs that do not end in `-free`. */
+export const FREE_ZEN_MODEL_IDS = new Set(["big-pickle"]);
+/** Models removed upstream — always filtered from the picker. */
+export const KNOWN_UNAVAILABLE_MODEL_IDS = new Set(["ring-2.6-1t", "ring-2.6-1t-free", "trinity-large-preview-free"]);
+
+/**
+ * Models that live on the OpenCode Zen gateway but with constrained GPU
+ * capacity. They were re-enabled after a brief shutdown ("Qwen 3.6 Plus —
+ * free, again. Round 2. We found more GPUs.") so they are NOT deprecated, but
+ * agentic workloads can still hit 5xx during bursts. Surfaced so users know
+ * to retry or fall back to another free model.
+ */
+export const CAPACITY_LIMITED_MODEL_NOTES: Record<string, string> = {
+  "qwen3.6-plus-free":
+    "Free relaunch with limited GPU capacity. Stable for short prompts; bursty traffic or very large tool catalogs may return 5xx - retry or fall back to 'deepseek-v4-flash-free' / 'big-pickle'. Paid 'qwen3.6-plus' has no quota.",
+};
+
+// ─── Per-family thinking defaults (see thinking.ts for the schema) ───────────
+
+export const THINKING_DEFAULTS = {
+  deepseek: "off",
+  glm: "off",
+  kimi: "off",
+  minimax: "off",
+  openai: "off",
+  qwen: "off",
+  qwenBudget: "auto",
+  mimo: "off",
+} as const;
diff --git a/src/extension.ts b/src/extension.ts
index 144f732..ad639ac 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -56,6 +56,68 @@ import { calculateModelLimits, type ModelLimits } from "./modelLimits";
 import { buildResponsesRequestEnvelope, joinedTextContent, responsesInputItemsFromMessage } from "./responsesRequest";
 import { runtimeDiagnosticsLines } from "./runtimeDiagnostics";
 import { estimatePromptTokenCount, estimateTokenCount } from "./tokenEstimate";
+import {
+  AGENTS_BYOK_BRIDGE_STATE_KEY,
+  AGENT_HOST_BYOK_ENABLED_SETTING,
+  AGENT_HOST_BYOK_MINOR_VERSION,
+  CAPACITY_LIMITED_MODEL_NOTES,
+  CONFIG_SECTION,
+  DEFAULT_REQUEST_TIMEOUT_SECONDS,
+  DEFAULT_STREAM_IDLE_TIMEOUT_SECONDS,
+  DEFAULT_VISION_PROXY_PROMPT,
+  EXTENSION_ID,
+  FALLBACK_USER_AGENT,
+  FREE_ZEN_MODEL_IDS,
+  IMAGE_TOKEN_ESTIMATE,
+  KNOWN_UNAVAILABLE_MODEL_IDS,
+  MAX_HISTORY_IMAGES_KEPT,
+  MAX_TOOL_RESULT_IMAGE_BYTES,
+  MESSAGE_NAME_TOKEN_OVERHEAD,
+  MESSAGE_TOKEN_OVERHEAD,
+  MODEL_LIST_CACHE_KEY_PREFIX,
+  MODEL_LIST_CACHE_TTL_MS,
+  MODEL_LIST_FETCH_MAX_RETRIES,
+  MODEL_LIST_FETCH_RETRY_BASE_MS,
+  MODEL_LIST_FETCH_TIMEOUT_MS,
+  MODEL_METADATA_FETCH_TIMEOUT_MS,
+  OPEN_CODE_CLIENT,
+  RECENT_TRANSPORT_SUMMARY_LIMIT,
+  RECENT_TRANSPORT_SUMMARY_STORAGE_PREFIX,
+  SECRET_KEY,
+  SETTING_AGENTS_WINDOW,
+  SETTING_AUTO_ENABLE_AGENTS_WINDOW,
+  SETTING_DEBUG_REASONING,
+  SETTING_ENABLED,
+  SETTING_FREE_ONLY,
+  SETTING_MAX_INPUT_TOKENS,
+  SETTING_MAX_TOKENS,
+  SETTING_REQUEST_TIMEOUT_SECONDS,
+  SETTING_SHOW_PROVIDER_PREFIX,
+  SETTING_SHOW_USAGE_STATUS_BAR,
+  SETTING_STREAM_IDLE_TIMEOUT_SECONDS,
+  SETTING_STRIP_THINK_TAGS,
+  SETTING_TEMPERATURE,
+  SETTING_THINKING_DEEPSEEK,
+  SETTING_THINKING_GLM,
+  SETTING_THINKING_KIMI,
+  SETTING_THINKING_MIMO,
+  SETTING_THINKING_MINIMAX,
+  SETTING_THINKING_OPENAI,
+  SETTING_THINKING_QWEN,
+  SETTING_THINKING_QWEN_BUDGET,
+  SETTING_VISION_PROXY_WHOLE_CONVERSATION,
+  SUPPORT_AGENTS_WINDOW_SETTING,
+  SUPPORT_AGENTS_WINDOW_STATE_KEY,
+  TEST_CONNECTION_TIMEOUT_MS,
+  THINKING_DEFAULTS,
+  TOOL_CALL_TOKEN_OVERHEAD,
+  TOOL_RESULT_TOKEN_OVERHEAD,
+  VISION_PROXY_MODEL_ID_KEY,
+  VISION_PROXY_PROMPT_KEY,
+} from "./config";
+import { escapeHtml, formatRelativeTime, formatTokenCount, formatUsd, getErrorMessage, isRecord, sleep, toFiniteNumber } from "./utils";
+import { parseToolInput as parseToolInputShared } from "./toolCallAccumulator";
+import { isFreeModel } from "./metadata";
 
 import { formatCacheHitRatio, formatUsageStatusBarText, formatUsageStatusBarTooltip, type UsageSnapshot } from "./usage";
 import {
@@ -83,10 +145,6 @@ import {
   type UsageProfile,
 } from "./usageProfile";
 
-const SECRET_KEY = "opencodego.apiKey";
-const RECENT_TRANSPORT_SUMMARY_LIMIT = 25;
-const RECENT_TRANSPORT_SUMMARY_STORAGE_PREFIX = "opencode.recentTransportSummaries";
-
 /**
  * VS Code core settings the extension manages (auto-configures and reverts)
  * so OpenCode models work in the Agents window (issue #122):
@@ -100,14 +158,6 @@ const RECENT_TRANSPORT_SUMMARY_STORAGE_PREFIX = "opencode.recentTransportSummari
  *   vendors are not registered, and neither the model picker nor the
  *   "+ Add Models" list knows OpenCode Go/Zen.
  */
-const AGENT_HOST_BYOK_ENABLED_SETTING = "byokModels.enabled";
-const SUPPORT_AGENTS_WINDOW_SETTING = "supportAgentsWindow";
-const EXTENSION_ID = "ltmoerdani.opencode-copilot-chat";
-/** How many VS Code versions old the agent-host BYOK bridge goes back to. */
-const AGENT_HOST_BYOK_MINOR_VERSION = 129;
-/** globalState keys tracking that the extension enabled each setting itself. */
-const AGENTS_BYOK_BRIDGE_STATE_KEY = "opencode.agentsByokBridge.v1";
-const SUPPORT_AGENTS_WINDOW_STATE_KEY = "opencode.supportAgentsWindow.v1";
 
 let usageStatusBarItem: vscode.StatusBarItem | undefined;
 let goUsageStatusBarItem: vscode.StatusBarItem | undefined;
@@ -246,30 +296,6 @@ interface ProviderDefinition {
 
 type ModelEndpointKind = "chat-completions" | "messages" | "responses" | "google";
 
-const FREE_ZEN_MODEL_IDS = new Set(["big-pickle"]);
-const KNOWN_UNAVAILABLE_MODEL_IDS = new Set(["ring-2.6-1t", "ring-2.6-1t-free", "trinity-large-preview-free"]);
-const DEFAULT_REQUEST_TIMEOUT_MS = 10 * 60 * 1000;
-const DEFAULT_STREAM_IDLE_TIMEOUT_MS = 2 * 60 * 1000;
-const OPEN_CODE_CLIENT = "vscode-copilot-chat";
-/** Fallback only — overridden at runtime by {@link getUserAgent} from packageJSON. */
-const FALLBACK_USER_AGENT = "opencode-copilot-chat/0.4.1 VSCode";
-
-/**
- * Hard ceiling for a single model-list fetch (connect + headers + body).
- *
- * Without this, undici's default `headersTimeout` (300s) can leave the picker
- * stuck for up to 5 minutes on a hung TCP connection (issue #78).
- */
-const MODEL_LIST_FETCH_TIMEOUT_MS = 15_000;
-/** Max retry attempts for transient network failures during model-list fetch. */
-const MODEL_LIST_FETCH_MAX_RETRIES = 3;
-/** Base delay for exponential backoff (500ms, 1s, 2s). */
-const MODEL_LIST_FETCH_RETRY_BASE_MS = 500;
-/** TTL for the last successful model-list snapshot cached in globalState. */
-const MODEL_LIST_CACHE_TTL_MS = 60 * 60 * 1000;
-/** globalState key suffix per vendor; full key = `${base}::<vendor>`. */
-const MODEL_LIST_CACHE_KEY_PREFIX = "opencode.modelListCache.v1";
-
 let cachedUserAgent: string | undefined;
 
 /**
@@ -322,7 +348,7 @@ function isTransientFetchError(error: unknown): boolean {
   // Extract HTTP status from either an explicit `.status` field or the
   // "Model list request failed (NNN): ..." message pattern.
   const explicitStatus = (error as { status?: number } | undefined)?.status;
-  const msg = error instanceof Error ? error.message : String(error);
+  const msg = getErrorMessage(error);
   const msgMatch = msg.match(/\((\d{3})\)/);
   const httpStatus = typeof explicitStatus === "number" ? explicitStatus : msgMatch ? Number(msgMatch[1]) : undefined;
   if (typeof httpStatus === "number") {
@@ -332,42 +358,6 @@ function isTransientFetchError(error: unknown): boolean {
   return false;
 }
 
-/**
- * Promise-based delay that rejects with AbortError if the token fires.
- *
- * Used to back off between model-list fetch retries without leaking
- * CancellationToken subscriptions.
- *
- * A single subscription suffices for already-cancelled tokens: VS Code's
- * cancellation tokens invoke listeners registered after cancellation
- * (shortcutEvent), and Promises ignore double settlement.
- */
-function sleep(ms: number, token?: vscode.CancellationToken): Promise<void> {
-  if (token?.isCancellationRequested) {
-    return Promise.reject(new DOMException("Aborted", "AbortError"));
-  }
-  return new Promise((resolve, reject) => {
-    const state: { timer?: ReturnType<typeof setTimeout>; subscription?: vscode.Disposable } = {};
-    const finish = (cancelled: boolean) => {
-      if (state.timer) clearTimeout(state.timer);
-      state.subscription?.dispose();
-      if (cancelled) {
-        reject(new DOMException("Aborted", "AbortError"));
-      } else {
-        resolve();
-      }
-    };
-    state.timer = setTimeout(() => {
-      finish(false);
-    }, ms);
-    if (token) {
-      state.subscription = token.onCancellationRequested(() => {
-        finish(true);
-      });
-    }
-  });
-}
-
 /** Create an agent-variant provider definition that inherits URLs, models, and filters from a base. */
 function providerVariant(
   base: ProviderDefinition,
@@ -472,7 +462,7 @@ const PROVIDERS: Record<ProviderDefinition["vendor"], ProviderDefinition> = (()
       "big-pickle",
     ],
     filterModel: (modelId) =>
-      vscode.workspace.getConfiguration("opencodego").get<boolean>("freeOnly", true)
+      vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_FREE_ONLY, true)
         ? modelId.endsWith("-free") || FREE_ZEN_MODEL_IDS.has(modelId)
         : true,
   };
@@ -589,11 +579,6 @@ type ConfiguredLanguageModelResponseOptions = vscode.ProvideLanguageModelChatRes
   configuration?: LanguageModelConfiguration;
 };
 
-const MESSAGE_TOKEN_OVERHEAD = 4;
-const MESSAGE_NAME_TOKEN_OVERHEAD = 1;
-const TOOL_CALL_TOKEN_OVERHEAD = 10;
-const TOOL_RESULT_TOKEN_OVERHEAD = 6;
-const IMAGE_TOKEN_ESTIMATE = 1024;
 /**
  * Hard upper limit (in bytes of raw image data) for a single image embedded
  * in a tool result. MCP screenshots from chrome-devtools-mcp / playwright-mcp
@@ -603,7 +588,6 @@ const IMAGE_TOKEN_ESTIMATE = 1024;
  * failed" rejections from OpenCode Go. Larger images are replaced with a
  * placeholder text part so the model still knows an image was returned.
  */
-const MAX_TOOL_RESULT_IMAGE_BYTES = 1_000_000;
 
 /**
  * Maximum number of image attachments (top-level + tool-result combined) to
@@ -632,18 +616,6 @@ const MAX_TOOL_RESULT_IMAGE_BYTES = 1_000_000;
  * still knows a screenshot existed at that point in the conversation (useful
  * for understanding agent-loop context) without incurring the payload cost.
  */
-const MAX_HISTORY_IMAGES_KEPT = 2;
-
-// Models live on the OpenCode Zen gateway but with constrained GPU capacity.
-// They were re-enabled by the OpenCode team after a brief shutdown
-// ("Qwen 3.6 Plus — free, again. Round 2. We found more GPUs.") so they are
-// NOT deprecated, but agentic workloads with long histories or large tool
-// catalogs can still hit 5xx during traffic bursts. Surface this so users know
-// to retry or fall back to another free model if the request fails.
-const CAPACITY_LIMITED_MODEL_NOTES: Record<string, string> = {
-  "qwen3.6-plus-free":
-    "Free relaunch with limited GPU capacity. Stable for short prompts; bursty traffic or very large tool catalogs may return 5xx - retry or fall back to 'deepseek-v4-flash-free' / 'big-pickle'. Paid 'qwen3.6-plus' has no quota.",
-};
 
 let modelMetadataSnapshot: CachedModelMetadataSnapshot | undefined;
 let modelMetadataRefreshPromise: Promise<CachedModelMetadataSnapshot> | undefined;
@@ -718,8 +690,6 @@ interface AnthropicRequestMessage {
   content: AnthropicContentBlock[];
 }
 
-const BASE64_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
 interface RecentTransportSummary extends TransportRequestSummary {
   recordedAt: string;
   endpointKind: string;
@@ -779,12 +749,12 @@ export function activate(context: vscode.ExtensionContext) {
     vscode.commands.registerCommand("opencodego.diagnostics", () => goProvider.showDiagnostics()),
     vscode.commands.registerCommand("opencodego.setApiKey", () => goProvider.setApiKey()),
     vscode.commands.registerCommand("opencodego.refreshModels", () => goProvider.refreshModels()),
-    vscode.commands.registerCommand("opencodego.toggleProvider", () => toggleProviderEnabled("opencodego", "OpenCode Go")),
+    vscode.commands.registerCommand("opencodego.toggleProvider", () => toggleProviderEnabled(GO_VENDOR, "OpenCode Go")),
     vscode.commands.registerCommand("opencodego.configureUtilityModels", () => configureUtilityModels()),
     vscode.commands.registerCommand("opencodezen.diagnostics", () => zenProvider.showDiagnostics()),
     vscode.commands.registerCommand("opencodezen.manage", () => zenProvider.manage()),
     vscode.commands.registerCommand("opencodezen.refreshModels", () => zenProvider.refreshModels()),
-    vscode.commands.registerCommand("opencodezen.toggleProvider", () => toggleProviderEnabled("opencodezen", "OpenCode Zen")),
+    vscode.commands.registerCommand("opencodezen.toggleProvider", () => toggleProviderEnabled(ZEN_VENDOR, "OpenCode Zen")),
     vscode.commands.registerCommand("opencodego.modelPickerDiagnostics", () => showModelPickerDiagnostics()),
     vscode.commands.registerCommand("opencodego.setThinkingEffort", () => showThinkingEffortPicker()),
     vscode.commands.registerCommand("opencodego.showUsageDetails", () => {
@@ -812,7 +782,7 @@ export function activate(context: vscode.ExtensionContext) {
         const sessionItem: vscode.QuickPickItem = {
           label: `$(comment) Latest Session (est)`,
           description: `$${sessionCost.cost.toFixed(4)}`,
-          detail: `${tokens(totalTokens)} tokens · ${String(sessionCost.requests)} requests`,
+          detail: `${formatTokenCount(totalTokens)} tokens · ${String(sessionCost.requests)} requests`,
           alwaysShow: true,
         };
         const dailyIdx = items.findIndex((i) => i.kind === vscode.QuickPickItemKind.Separator && i.label === "Daily Summary");
@@ -956,7 +926,7 @@ export function activate(context: vscode.ExtensionContext) {
   ];
 
   // Agent-host providers for the Copilot Agents window (opt-in via config).
-  const enableAgents = vscode.workspace.getConfiguration("opencodego").get<boolean>("agentsWindow", true);
+  const enableAgents = vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_AGENTS_WINDOW, true);
   if (enableAgents && (goProviderEnabled || zenProviderEnabled)) {
     const agentGoProvider = new OpenCodeProvider(context, PROVIDERS[AGENT_GO_VENDOR]);
     const agentZenProvider = new OpenCodeProvider(context, PROVIDERS[AGENT_ZEN_VENDOR]);
@@ -976,17 +946,20 @@ export function activate(context: vscode.ExtensionContext) {
 
   context.subscriptions.push(
     vscode.workspace.onDidChangeConfiguration((event) => {
-      if (event.affectsConfiguration("opencodego.showUsageStatusBar")) {
+      if (event.affectsConfiguration(`${CONFIG_SECTION}.${SETTING_SHOW_USAGE_STATUS_BAR}`)) {
         resetUsageStatusBar();
       }
-      if (event.affectsConfiguration("opencodego.showProviderPrefix")) {
+      if (event.affectsConfiguration(`${CONFIG_SECTION}.${SETTING_SHOW_PROVIDER_PREFIX}`)) {
         for (const provider of modelInfoProviders) {
           provider.notifyModelInfoChanged();
         }
       }
-      if (event.affectsConfiguration("opencodego.agentsWindow") || event.affectsConfiguration("opencodego.autoEnableAgentsWindow")) {
-        const agentsWindowEnabled = vscode.workspace.getConfiguration("opencodego").get<boolean>("agentsWindow", true);
-        const autoEnabled = vscode.workspace.getConfiguration("opencodego").get<boolean>("autoEnableAgentsWindow", true);
+      if (
+        event.affectsConfiguration(`${CONFIG_SECTION}.${SETTING_AGENTS_WINDOW}`) ||
+        event.affectsConfiguration(`${CONFIG_SECTION}.${SETTING_AUTO_ENABLE_AGENTS_WINDOW}`)
+      ) {
+        const agentsWindowEnabled = vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_AGENTS_WINDOW, true);
+        const autoEnabled = vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_AUTO_ENABLE_AGENTS_WINDOW, true);
         if (agentsWindowEnabled && autoEnabled) {
           void ensureAgentsWindowSupport(context);
         } else if (!agentsWindowEnabled) {
@@ -1029,7 +1002,7 @@ async function configureUtilityModels(): Promise<void> {
  */
 async function toggleProviderEnabled(vendor: string, displayName: string): Promise<void> {
   const cfg = vscode.workspace.getConfiguration(vendor);
-  const current = cfg.get<boolean>("enabled", true);
+  const current = cfg.get<boolean>(SETTING_ENABLED, true);
   const next = !current;
   await cfg.update("enabled", next, vscode.ConfigurationTarget.Global);
 
@@ -1086,8 +1059,8 @@ function isModernAgentHostVscode(): boolean {
  *   anything was changed.
  */
 async function ensureAgentsWindowSupport(context: vscode.ExtensionContext): Promise<void> {
-  const opencodeCfg = vscode.workspace.getConfiguration("opencodego");
-  if (!opencodeCfg.get<boolean>("agentsWindow", true) || !opencodeCfg.get<boolean>("autoEnableAgentsWindow", true)) {
+  const opencodeCfg = vscode.workspace.getConfiguration(CONFIG_SECTION);
+  if (!opencodeCfg.get<boolean>(SETTING_AGENTS_WINDOW, true) || !opencodeCfg.get<boolean>(SETTING_AUTO_ENABLE_AGENTS_WINDOW, true)) {
     return;
   }
 
@@ -1153,7 +1126,7 @@ async function warmModelPickerMetadata(): Promise<void> {
     ...(vscode.workspace.getConfiguration().get<boolean>(providerEnabledSetting(GO_VENDOR), true) ? [GO_VENDOR] : []),
     ...(vscode.workspace.getConfiguration().get<boolean>(providerEnabledSetting(ZEN_VENDOR), true) ? [ZEN_VENDOR] : []),
   ];
-  if (vscode.workspace.getConfiguration("opencodego").get<boolean>("agentsWindow", true) && vendors.length > 0) {
+  if (vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_AGENTS_WINDOW, true) && vendors.length > 0) {
     vendors.push(AGENT_GO_VENDOR, AGENT_ZEN_VENDOR);
   }
   await Promise.allSettled(vendors.map((v) => vscode.lm.selectChatModels({ vendor: v })));
@@ -1161,7 +1134,7 @@ async function warmModelPickerMetadata(): Promise<void> {
 
 async function showModelPickerDiagnostics(): Promise<void> {
   const vendors: string[] = [GO_VENDOR, ZEN_VENDOR, "copilot"];
-  if (vscode.workspace.getConfiguration("opencodego").get<boolean>("agentsWindow", true)) {
+  if (vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_AGENTS_WINDOW, true)) {
     vendors.splice(2, 0, AGENT_GO_VENDOR, AGENT_ZEN_VENDOR);
   }
   const sections: string[] = [];
@@ -1217,7 +1190,7 @@ async function showThinkingEffortPicker(): Promise<void> {
     placeHolder: `Set ${family.family.label} → Thinking value`,
   });
   if (!choice) return;
-  const cfg = vscode.workspace.getConfiguration("opencodego.thinking");
+  const cfg = vscode.workspace.getConfiguration(`${CONFIG_SECTION}.thinking`);
   await cfg.update(family.family.key, choice, vscode.ConfigurationTarget.Global);
   vscode.window.showInformationMessage(`OpenCode Thinking — ${family.family.label}: ${choice}`);
 }
@@ -1237,7 +1210,7 @@ function ensureUsageStatusBar(context: vscode.ExtensionContext): vscode.StatusBa
 }
 
 function shouldShowUsageStatusBar(): boolean {
-  return vscode.workspace.getConfiguration("opencodego").get("showUsageStatusBar", true);
+  return vscode.workspace.getConfiguration(CONFIG_SECTION).get(SETTING_SHOW_USAGE_STATUS_BAR, true);
 }
 
 function resetUsageStatusBar(): void {
@@ -1364,7 +1337,7 @@ function updateWebviewContent(): void {
     <head>
       <meta charset="UTF-8">
       <meta name="viewport" content="width=device-width, initial-scale=1.0">
-      <title>OpenCode Usage Summary — ${escapeSvg(profileLabel)}</title>
+      <title>OpenCode Usage Summary — ${escapeHtml(profileLabel)}</title>
       <style>
         :root {
           --bg: var(--vscode-editorWidget-background, #252526);
@@ -1447,7 +1420,7 @@ function updateWebviewContent(): void {
     </head>
     <body>
       <div class="card">
-        <div class="title">${escapeSvg(profileLabel)} - Usage</div>
+        <div class="title">${escapeHtml(profileLabel)} - Usage</div>
 
         ${usageCardSectionHtml("Session (5h rolling)", s.session)}
         ${usageCardSectionHtml("Weekly", s.weekly)}
@@ -1475,12 +1448,12 @@ function usageCardSectionHtml(label: string, p: _UsageSummary["session"]): strin
   return [
     '<div class="section">',
     '<div class="row-label">',
-    `<span class="name">${escapeSvg(label)}</span>`,
-    `<span class="resets">Resets in ${escapeSvg(rel(p.resetsAt))}</span>`,
+    `<span class="name">${escapeHtml(label)}</span>`,
+    `<span class="resets">Resets in ${escapeHtml(formatRelativeTime(p.resetsAt))}</span>`,
     "</div>",
     `<div class="bar"><div class="bar-fill" style="width:${width}%"></div></div>`,
     '<div class="row-sub">',
-    `<span class="used">${escapeSvg(`${usd(p.spent)} / ${usd(p.limit)} used`)}</span>`,
+    `<span class="used">${escapeHtml(`${formatUsd(p.spent)} / ${formatUsd(p.limit)} used`)}</span>`,
     `<span class="pct">${pct}%</span>`,
     "</div>",
     "</div>",
@@ -1491,9 +1464,9 @@ function usageCardSectionHtml(label: string, p: _UsageSummary["session"]): strin
 function usageCardStatsHtml(label: string, day: _UsageSummary["today"]): string {
   return [
     '<div class="stats">',
-    `<div class="stat"><div class="label">${escapeSvg(label)}</div><div class="value">${escapeSvg(usd(day.cost))}</div></div>`,
+    `<div class="stat"><div class="label">${escapeHtml(label)}</div><div class="value">${escapeHtml(formatUsd(day.cost))}</div></div>`,
     `<div class="stat"><div class="label">Requests</div><div class="value">${day.requests}</div></div>`,
-    `<div class="stat"><div class="label">Tokens</div><div class="value">${escapeSvg(tokens(day.tokens))}</div></div>`,
+    `<div class="stat"><div class="label">Tokens</div><div class="value">${escapeHtml(formatTokenCount(day.tokens))}</div></div>`,
     "</div>",
   ].join("");
 }
@@ -1648,11 +1621,11 @@ function buildUsageTooltipSvg(
   const line = "#333333";
   const font = "-apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif";
 
-  const svgTitle = escapeSvg(profileLabel ? `${profileLabel} - Usage` : "OpenCode Go - Usage");
+  const svgTitle = escapeHtml(profileLabel ? `${profileLabel} - Usage` : "OpenCode Go - Usage");
   const noDataMsg = s.hasData ? null : nonLegacyCount(profilesCache) > 0 ? "No data yet for this profile." : "No usage data yet.";
 
   const text = (value: string, x: number, y: number, size: number, weight = 400, color = fg, anchor: "start" | "end" = "start"): string =>
-    `<text x="${String(x)}" y="${String(y)}" fill="${color}" font-family="${font}" font-size="${String(size)}" font-weight="${String(weight)}" text-anchor="${anchor}">${escapeSvg(value)}</text>`;
+    `<text x="${String(x)}" y="${String(y)}" fill="${color}" font-family="${font}" font-size="${String(size)}" font-weight="${String(weight)}" text-anchor="${anchor}">${escapeHtml(value)}</text>`;
 
   const bar = (pct: number, x: number, y: number, barWidth: number): string => {
     const clamped = Math.min(Math.max(pct, 0), 100);
@@ -1669,10 +1642,10 @@ function buildUsageTooltipSvg(
   const period = (label: string, p: _UsageSummary["session"], y: number): string =>
     [
       text(label, padX, y, 14, 700),
-      text(`Resets in ${rel(p.resetsAt)}`, right, y, 12, 400, muted, "end"),
+      text(`Resets in ${formatRelativeTime(p.resetsAt)}`, right, y, 12, 400, muted, "end"),
       bar(p.percent, padX, y + 14, 340),
       text(`${p.percent.toFixed(1)}%`, right, y + 21, 14, 700, fg, "end"),
-      text(`${usd(p.spent)} / ${usd(p.limit)} used`, padX, y + 36, 13, 400, fg),
+      text(`${formatUsd(p.spent)} / ${formatUsd(p.limit)} used`, padX, y + 36, 13, 400, fg),
     ].join("");
 
   // Device-local rows share one fixed column grid: label, cost, requests,
@@ -1680,11 +1653,11 @@ function buildUsageTooltipSvg(
   const deviceRow = (label: string, cost: number, requests: number, tokenCount: number, y: number): string =>
     [
       text(label, padX, y, 13, 400, muted),
-      text(usd(cost), 120, y, 13, 700),
+      text(formatUsd(cost), 120, y, 13, 700),
       text("Requests:", 190, y, 13, 400, muted),
       text(String(requests), 262, y, 13, 700),
       text("Tokens:", 305, y, 13, 400, muted),
-      text(tokens(tokenCount), 385, y, 13, 700),
+      text(formatTokenCount(tokenCount), 385, y, 13, 700),
     ].join("");
 
   if (!s.hasData) {
@@ -1726,29 +1699,6 @@ ${meterRows.map(([label, periodValue, y]) => period(label, periodValue, y)).join
 ${deviceRows.map(([label, cost, requests, tokenCount, y]) => deviceRow(label, cost, requests, tokenCount, y)).join("")}</svg>`;
 }
 
-function escapeSvg(value: string): string {
-  return value.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;");
-}
-
-function usd(v: number): string {
-  return `$${v.toFixed(2)}`;
-}
-function tokens(v: number): string {
-  if (v >= 1_000_000) return `${(v / 1_000_000).toFixed(1)}M`;
-  if (v >= 1_000) return `${(v / 1_000).toFixed(1)}K`;
-  return v.toString();
-}
-function rel(date: Date): string {
-  const min = Math.max(0, Math.floor((date.getTime() - Date.now()) / 60_000));
-  if (min < 60) return `${String(min)}m`;
-  const h = Math.floor(min / 60),
-    m = min % 60;
-  if (h < 24) return m ? `${String(h)}h ${String(m)}m` : `${String(h)}h`;
-  const d = Math.floor(h / 24),
-    rh = h % 24;
-  return rh ? `${String(d)}d ${String(rh)}h` : `${String(d)}d`;
-}
-
 class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel> {
   private readonly changeEmitter = new vscode.EventEmitter<void>();
   readonly onDidChangeLanguageModelChatInformation = this.changeEmitter.event;
@@ -2075,7 +2025,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
           max_tokens: 10,
           stream: false,
         }),
-        signal: AbortSignal.timeout(30_000),
+        signal: AbortSignal.timeout(TEST_CONNECTION_TIMEOUT_MS),
       });
 
       const responseText = await response.text();
@@ -2091,7 +2041,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
         );
       }
     } catch (error) {
-      const message = error instanceof Error ? error.message : String(error);
+      const message = getErrorMessage(error);
       this.log(`Test connection error: ${message}`);
       vscode.window.showErrorMessage(`${this.definition.displayName}: Connection error - ${message}`);
     } finally {
@@ -2123,7 +2073,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
     try {
       models = await vscode.lm.selectChatModels({ vendor: this.definition.vendor });
     } catch (error) {
-      modelSelectionError = error instanceof Error ? error.message : String(error);
+      modelSelectionError = getErrorMessage(error);
     }
 
     const hasStoredApiKey = Boolean(await this.context.secrets.get(SECRET_KEY));
@@ -2271,7 +2221,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
 
     const settings = getSettings();
     const metadataSnapshot = await this.getMetadataSnapshot();
-    const showProviderPrefix = vscode.workspace.getConfiguration("opencodego").get<boolean>("showProviderPrefix", true);
+    const showProviderPrefix = vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_SHOW_PROVIDER_PREFIX, true);
 
     // CONTRACT: VS Code calls provideLanguageModelChatInformation frequently
     // (every ~300ms during UI refresh). Per-model logging produces thousands
@@ -2299,7 +2249,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
 
       const capacityNote = CAPACITY_LIMITED_MODEL_NOTES[modelId];
       const modalityBadges = formatModalityBadges(metadata);
-      const baseDetail = this.baseVendor === ZEN_VENDOR && isFreeZenModel(modelId) ? "Free" : this.definition.displayName;
+      const baseDetail = this.baseVendor === ZEN_VENDOR && isFreeModel(modelId) ? "Free" : this.definition.displayName;
       const baseTooltip = `${this.definition.displayName} model: ${modelId}`;
       const configurationSchema = modelConfigurationSchema(modelId, metadata);
 
@@ -2444,7 +2394,9 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
       // When `opencodego.visionProxyWholeConversation` is on, describe the whole
       // conversation instead of only the message with a new image, so descriptions
       // keep conversation context (at the cost of more tokens).
-      const describeWholeConversation = vscode.workspace.getConfiguration("opencodego").get<boolean>("visionProxyWholeConversation", false);
+      const describeWholeConversation = vscode.workspace
+        .getConfiguration(CONFIG_SECTION)
+        .get<boolean>(SETTING_VISION_PROXY_WHOLE_CONVERSATION, false);
       let imagesHandled = false;
       try {
         this.log(`[vision-proxy] Forwarding images to ${visionProxyModelId}${describeWholeConversation ? " (whole conversation)" : ""}`);
@@ -2479,7 +2431,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
           );
         }
       } catch (err) {
-        this.log(`[vision-proxy] Error: ${err instanceof Error ? err.message : String(err)}`);
+        this.log(`[vision-proxy] Error: ${getErrorMessage(err)}`);
       }
 
       // If the proxy didn't handle the images (error, empty response, or
@@ -2670,7 +2622,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
       });
       this.log(`Request completed: model=${model.id}`);
     } catch (error) {
-      const message = error instanceof Error ? error.message : String(error);
+      const message = getErrorMessage(error);
       this.log(`ERROR model=${model.id}: ${message}`);
       if (error instanceof OpenCodeRequestError) {
         vscode.window.showErrorMessage(error.userMessage);
@@ -2746,8 +2698,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
           .filter((id): id is string => typeof id === "string" && id.length > 0)
           .filter((id) => this.definition.filterModel?.(id) ?? true);
 
-        const resolved = this.filterAvailableModels(ids?.length ? ids : this.definition.fallbackModels);
-        const filtered = await resolved;
+        const filtered = await this.filterAvailableModels(ids?.length ? ids : this.definition.fallbackModels);
         // Persist the successful snapshot for future fallback coverage.
         this.cachedModelList = { ids: filtered, fetchedAt: Date.now() };
         void this.context.globalState.update(this.modelListCacheKey, this.cachedModelList);
@@ -2876,7 +2827,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
 
       return filteredModelIds;
     } catch (error) {
-      const message = error instanceof Error ? error.message : String(error);
+      const message = getErrorMessage(error);
       this.log(`Could not fetch model status metadata from models.dev. Applying local unavailable model filter only. ${message}`);
       return uniqueModelIds.filter((modelId) => !KNOWN_UNAVAILABLE_MODEL_IDS.has(modelId));
     }
@@ -2921,7 +2872,7 @@ async function refreshOpenCodeModelMetadata(
 
   modelMetadataRefreshPromise = (async () => {
     const response = await fetch(MODELS_DEV_API_URL, {
-      signal: AbortSignal.timeout(10_000),
+      signal: AbortSignal.timeout(MODEL_METADATA_FETCH_TIMEOUT_MS),
     });
 
     if (!response.ok) {
@@ -2940,13 +2891,13 @@ async function refreshOpenCodeModelMetadata(
     .catch((error: unknown) => {
       const cached = modelMetadataSnapshot ?? context.globalState.get<CachedModelMetadataSnapshot>(MODEL_METADATA_CACHE_KEY);
       if (cached) {
-        const message = error instanceof Error ? error.message : String(error);
+        const message = getErrorMessage(error);
         output?.appendLine(`[metadata] refresh failed, using cached snapshot: ${message}`);
         modelMetadataSnapshot = cached;
         return cached;
       }
 
-      const message = error instanceof Error ? error.message : String(error);
+      const message = getErrorMessage(error);
       const fallback = bundledModelMetadataSnapshot();
       output?.appendLine(`[metadata] refresh failed, using bundled snapshot: ${message}`);
       modelMetadataSnapshot = fallback;
@@ -3271,7 +3222,7 @@ function googleContentsFromMessages(messages: ApiMessage[]): Record<string, unkn
         parts.push({ text });
       }
       for (const toolCall of message.tool_calls ?? []) {
-        const args = parseToolInput(toolCall.function.arguments);
+        const args = parseToolInputShared(toolCall.function.arguments);
         parts.push({ functionCall: { name: toolCall.function.name, args } });
         toolNamesById.set(toolCall.id, toolCall.function.name);
       }
@@ -3375,19 +3326,6 @@ function googleFunctionResponseContent(
   return { name, content: text, parts };
 }
 
-function parseToolInput(value: string): object {
-  if (!value.trim()) {
-    return {};
-  }
-
-  try {
-    const parsed: unknown = JSON.parse(value);
-    return isRecord(parsed) ? parsed : {};
-  } catch {
-    return {};
-  }
-}
-
 // The official OpenCode client sends these headers on every request. The Zen
 // gateway reads x-opencode-session first, then converts that sticky identifier
 // into provider-specific affinity headers such as x-session-affinity upstream.
@@ -3520,7 +3458,7 @@ function sanitizeToolSchema(schema: unknown): object {
   }
 
   return {
-    type: sanitized.type === "object" ? "object" : "object",
+    type: "object",
     properties: isRecord(sanitized.properties) ? sanitized.properties : {},
     ...(Array.isArray(sanitized.required) ? { required: sanitized.required } : {}),
   };
@@ -3849,21 +3787,7 @@ async function convertMessage(
 }
 
 function dataPartToBase64(data: Uint8Array): string {
-  let output = "";
-
-  for (let index = 0; index < data.length; index += 3) {
-    const first = data[index] ?? 0;
-    const second = data[index + 1] ?? 0;
-    const third = data[index + 2] ?? 0;
-    const chunk = (first << 16) | (second << 8) | third;
-
-    output += BASE64_ALPHABET[(chunk >> 18) & 63];
-    output += BASE64_ALPHABET[(chunk >> 12) & 63];
-    output += index + 1 < data.length ? BASE64_ALPHABET[(chunk >> 6) & 63] : "=";
-    output += index + 2 < data.length ? BASE64_ALPHABET[chunk & 63] : "=";
-  }
-
-  return output;
+  return Buffer.from(data).toString("base64");
 }
 
 function reasoningForToolCalls(toolCalls: OpenAiToolCall[], reasoningContentByToolCallId: ReadonlyMap<string, string>): string | undefined {
@@ -4197,26 +4121,35 @@ function pickThinkingModelConfiguration(override: Record<string, unknown> | unde
 }
 
 function getSettings(): ApiSettings {
-  const config = vscode.workspace.getConfiguration("opencodego");
+  const config = vscode.workspace.getConfiguration(CONFIG_SECTION);
 
+  // Config values are sanitized so a misconfigured (e.g. string) value never
+  // reaches the request body and 400s upstream.
   return {
-    temperature: config.get("temperature", 0.2),
-    maxOutputTokensOverride: config.get("maxTokens", 0),
-    maxInputTokensOverride: config.get("maxInputTokens", 0),
-    debugReasoning: config.get("debugReasoning", false),
-    requestTimeoutMs: Math.max(config.get("requestTimeoutSeconds", DEFAULT_REQUEST_TIMEOUT_MS / 1000), 1) * 1000,
-    streamIdleTimeoutMs: Math.max(config.get("streamIdleTimeoutSeconds", DEFAULT_STREAM_IDLE_TIMEOUT_MS / 1000), 1) * 1000,
+    temperature: toFiniteNumber(config.get(SETTING_TEMPERATURE, 0.2), 0.2),
+    maxOutputTokensOverride: toFiniteNumber(config.get(SETTING_MAX_TOKENS, 0), 0, 0),
+    maxInputTokensOverride: toFiniteNumber(config.get(SETTING_MAX_INPUT_TOKENS, 0), 0, 0),
+    debugReasoning: config.get(SETTING_DEBUG_REASONING, false),
+    requestTimeoutMs:
+      toFiniteNumber(config.get(SETTING_REQUEST_TIMEOUT_SECONDS, DEFAULT_REQUEST_TIMEOUT_SECONDS), DEFAULT_REQUEST_TIMEOUT_SECONDS, 1) *
+      1000,
+    streamIdleTimeoutMs:
+      toFiniteNumber(
+        config.get(SETTING_STREAM_IDLE_TIMEOUT_SECONDS, DEFAULT_STREAM_IDLE_TIMEOUT_SECONDS),
+        DEFAULT_STREAM_IDLE_TIMEOUT_SECONDS,
+        1,
+      ) * 1000,
     thinking: {
-      deepseek: config.get<ThinkingSettings["deepseek"]>("thinking.deepseek", "off"),
-      glm: config.get<ThinkingSettings["glm"]>("thinking.glm", "off"),
-      kimi: config.get<ThinkingSettings["kimi"]>("thinking.kimi", "off"),
-      minimax: config.get<ThinkingSettings["minimax"]>("thinking.minimax", "off"),
-      openai: config.get<ThinkingSettings["openai"]>("thinking.openai", "off"),
-      qwen: config.get<ThinkingSettings["qwen"]>("thinking.qwen", "off"),
-      qwenBudget: config.get<ThinkingSettings["qwenBudget"]>("thinking.qwenBudget", "auto"),
-      mimo: config.get<ThinkingSettings["mimo"]>("thinking.mimo", "off"),
+      deepseek: config.get<ThinkingSettings["deepseek"]>(SETTING_THINKING_DEEPSEEK, THINKING_DEFAULTS.deepseek),
+      glm: config.get<ThinkingSettings["glm"]>(SETTING_THINKING_GLM, THINKING_DEFAULTS.glm),
+      kimi: config.get<ThinkingSettings["kimi"]>(SETTING_THINKING_KIMI, THINKING_DEFAULTS.kimi),
+      minimax: config.get<ThinkingSettings["minimax"]>(SETTING_THINKING_MINIMAX, THINKING_DEFAULTS.minimax),
+      openai: config.get<ThinkingSettings["openai"]>(SETTING_THINKING_OPENAI, THINKING_DEFAULTS.openai),
+      qwen: config.get<ThinkingSettings["qwen"]>(SETTING_THINKING_QWEN, THINKING_DEFAULTS.qwen),
+      qwenBudget: config.get<ThinkingSettings["qwenBudget"]>(SETTING_THINKING_QWEN_BUDGET, THINKING_DEFAULTS.qwenBudget),
+      mimo: config.get<ThinkingSettings["mimo"]>(SETTING_THINKING_MIMO, THINKING_DEFAULTS.mimo),
     },
-    stripThinkTags: config.get<ApiSettings["stripThinkTags"]>("stripThinkTags", "auto"),
+    stripThinkTags: config.get<ApiSettings["stripThinkTags"]>(SETTING_STRIP_THINK_TAGS, "auto"),
   };
 }
 
@@ -4260,10 +4193,7 @@ function formatModalityBadges(metadata: ResolvedModelMetadata): string {
   if (metadata.supportsVideo) {
     badges.push("Video");
   }
-  if (metadata.supportsAudio && !metadata.supportsVideo && !metadata.supportsPdf) {
-    badges.push("Audio");
-  }
-  if (metadata.supportsAudio && (metadata.supportsVideo || metadata.supportsPdf)) {
+  if (metadata.supportsAudio) {
     badges.push("Audio");
   }
   return badges.join(" · ");
@@ -4287,14 +4217,6 @@ function resolveRawModelId(modelId: string): string {
   return base;
 }
 
-function isFreeZenModel(modelId: string): boolean {
-  return modelId.endsWith("-free") || FREE_ZEN_MODEL_IDS.has(modelId);
-}
-
-function isFreeModel(modelId: string): boolean {
-  return FREE_ZEN_MODEL_IDS.has(modelId) || modelId.endsWith("-free");
-}
-
 /** Result of a vision-proxy pass: per-message descriptions plus cache stats. */
 interface VisionProxyResult {
   /** Original message index → text description (only for messages with images). */
@@ -4329,33 +4251,13 @@ function collectRequestParts(msg: vscode.LanguageModelChatRequestMessage): (vsco
  * the proxy describe ONLY the message that contains a new image, instead of
  * re-sending the whole conversation on every turn.
  */
-function buildVisionRequestMessage(msg: vscode.LanguageModelChatRequestMessage, visionPrompt: string): vscode.LanguageModelChatMessage[] {
-  const requestMessages: vscode.LanguageModelChatMessage[] = [];
-  const parts = collectRequestParts(msg);
-  if (parts.length > 0) {
-    requestMessages.push(
-      new vscode.LanguageModelChatMessage(
-        msg.role === vscode.LanguageModelChatMessageRole.Assistant
-          ? vscode.LanguageModelChatMessageRole.Assistant
-          : vscode.LanguageModelChatMessageRole.User,
-        parts,
-      ),
-    );
-  }
-  // Append the vision prompt
-  if (visionPrompt) {
-    requestMessages.push(vscode.LanguageModelChatMessage.User(visionPrompt));
-  }
-  return requestMessages;
-}
-
 /**
- * Build a vision-model request over the WHOLE conversation: keep image and
- * text parts from every message (dropping tool parts), then append the vision
- * prompt. Used when `opencodego.visionProxyWholeConversation` is enabled, so
- * descriptions carry full conversation context (at the cost of more tokens).
+ * Build a vision-model request: keep image and text parts from every message
+ * (dropping tool parts), then append the vision prompt. Used both for the
+ * per-message path (single message) and the whole-conversation path (all
+ * messages) when `opencodego.visionProxyWholeConversation` is enabled.
  */
-function buildWholeConversationRequest(
+function buildVisionRequest(
   messages: readonly vscode.LanguageModelChatRequestMessage[],
   visionPrompt: string,
 ): vscode.LanguageModelChatMessage[] {
@@ -4465,7 +4367,7 @@ async function proxyVision(
     if (imageIndices.length > 0) {
       cacheMisses++;
       const model = await resolveVisionModel();
-      const response = await model.sendRequest(buildWholeConversationRequest(messages, visionPrompt), {}, token);
+      const response = await model.sendRequest(buildVisionRequest(messages, visionPrompt), {}, token);
       let fullDescription = "";
       for await (const part of response.text) {
         fullDescription += part;
@@ -4501,7 +4403,7 @@ async function proxyVision(
     // At least one new image → describe only this message and cache the result.
     cacheMisses++;
     const model = await resolveVisionModel();
-    const response = await model.sendRequest(buildVisionRequestMessage(msg, visionPrompt), {}, token);
+    const response = await model.sendRequest(buildVisionRequest([msg], visionPrompt), {}, token);
     let fullDescription = "";
     for await (const part of response.text) {
       fullDescription += part;
@@ -4520,12 +4422,6 @@ async function proxyVision(
 // Vision proxy — globalState storage keys & defaults
 // ---------------------------------------------------------------------------
 
-const VISION_PROXY_MODEL_ID_KEY = "opencodego.visionProxyModelId";
-const VISION_PROXY_PROMPT_KEY = "opencodego.visionProxyPrompt";
-const DEFAULT_VISION_PROXY_PROMPT =
-  "Describe this image in detail so a text-only model can understand what it shows. " +
-  "Include all visible text, layout, colors, objects, and context.";
-
 /**
  * True when a vision proxy model has been configured (non-empty model ID
  * stored in globalState via the "OpenCode Go: Configure Vision Proxy" command).
@@ -4745,7 +4641,3 @@ function costCategory(cost: { input: number; output: number }): string {
   if (weighted <= 50) return "high";
   return "very_high";
 }
-
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return typeof value === "object" && value !== null;
-}
diff --git a/src/goUsageSync.ts b/src/goUsageSync.ts
index 645eacc..d644a1c 100644
--- a/src/goUsageSync.ts
+++ b/src/goUsageSync.ts
@@ -13,11 +13,9 @@ import type { UsageSummary } from "./goUsageTracker";
  * where `percent` is an integer 0–100 computed server-side and `resetsAt` is
  * an ISO timestamp.
  */
-export const GO_USAGE_API_URL = "https://opencode.ai/zen/go/v1/usage";
-/** How long a successful server-usage snapshot is reused before refetching. */
-export const GO_USAGE_SYNC_TTL_MS = 60_000;
-/** Hard timeout for a single usage fetch. */
-export const GO_USAGE_FETCH_TIMEOUT_MS = 10_000;
+import { GO_USAGE_API_URL, GO_USAGE_FETCH_TIMEOUT_MS } from "./config";
+
+export { GO_USAGE_API_URL, GO_USAGE_SYNC_TTL_MS, GO_USAGE_FETCH_TIMEOUT_MS } from "./config";
 
 export type GoUsagePeriodStatus = "ok" | "rate-limited";
 
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index 944898d..e86ff9c 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -7,27 +7,32 @@ import { GO_VENDOR } from "./providerTypes";
 import type { ModelCost } from "./metadata";
 import type { TransportRequestSummary } from "./streaming";
 import { fetchGoUsage, mergeServerUsage, GO_USAGE_SYNC_TTL_MS, type GoUsageApiResponse } from "./goUsageSync";
+import {
+  GO_LIMITS,
+  FIVE_HOURS_MS,
+  WEEK_MS,
+  GO_USAGE_LOG_KEY,
+  GO_USAGE_BASELINE_KEY,
+  GO_EVER_TRACKED_KEY,
+  GO_SESSION_COSTS_KEY,
+  GO_MAX_LOG_ENTRIES,
+  GO_SESSION_IDLE_MS,
+  GO_MAX_SESSIONS,
+} from "./config";
+import { formatTokenCount, formatUsd, formatRelativeTime } from "./utils";
+
+export { GO_LIMITS } from "./config";
 
 /** Callback to resolve live model cost from the models.dev metadata cache. */
 export type CostResolver = (modelId: string) => ModelCost | undefined;
 
-// ─── Constants ──────────────────────────────────────────────────────────────
+// ─── Constants (values centralized in ./config) ──────────────────────────────
 
-const STORAGE_KEY = "opencodego.usageLog.v1";
-const BASELINE_STORAGE_KEY = "opencodego.usageBaseline.v1";
-const EVER_TRACKED_KEY = "opencodego.everTracked.v1";
-const SESSION_COSTS_KEY = "opencodego.sessionCosts.v1";
-const MAX_LOG_ENTRIES = 2000;
-
-/** OpenCode Go subscription limits in USD, from https://opencode.ai/docs/go */
-export const GO_LIMITS = {
-  session: 12, // $12 per rolling 5-hour window
-  weekly: 30, // $30 per week (Mon–Mon UTC)
-  monthly: 60, // $60 per month (anchor-based)
-} as const;
-
-const FIVE_HOURS_MS = 5 * 60 * 60 * 1000;
-const WEEK_MS = 7 * 24 * 60 * 60 * 1000;
+const STORAGE_KEY = GO_USAGE_LOG_KEY;
+const BASELINE_STORAGE_KEY = GO_USAGE_BASELINE_KEY;
+const EVER_TRACKED_KEY = GO_EVER_TRACKED_KEY;
+const SESSION_COSTS_KEY = GO_SESSION_COSTS_KEY;
+const MAX_LOG_ENTRIES = GO_MAX_LOG_ENTRIES;
 
 // ─── Go model pricing ($/1M tokens) — bundled snapshot fallback ────────────
 // This table is a static snapshot kept as a last resort. The primary source
@@ -310,8 +315,8 @@ export class GoUsageTracker {
   private serverUsageFetchedAt = 0;
   /** In-flight sync promise per key — prevents duplicate concurrent fetches. */
   private syncInFlight: { apiKey: string; promise: Promise<boolean> } | undefined;
-  private static readonly SESSION_IDLE_MS = 2 * 60 * 60 * 1000; // 2h
-  private static readonly MAX_SESSIONS = 50;
+  private static readonly SESSION_IDLE_MS = GO_SESSION_IDLE_MS;
+  private static readonly MAX_SESSIONS = GO_MAX_SESSIONS;
 
   constructor(
     private readonly context: vscode.ExtensionContext,
@@ -947,32 +952,11 @@ export class GoUsageTracker {
 
 // ─── Formatting helpers ──────────────────────────────────────────────────────
 
-function fmtUsd(v: number): string {
-  return `$${v.toFixed(2)}`;
-}
-
-function fmtTokens(n: number): string {
-  if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(1)}M`;
-  if (n >= 1_000) return `${String(Math.round(n / 1_000))}k`;
-  return String(n);
-}
-
 function progressBar(percent: number, width = 10): string {
   const filled = Math.round((percent / 100) * width);
   return "█".repeat(filled) + "░".repeat(width - filled);
 }
 
-function fmtRelativeTime(target: Date, from: Date = new Date()): string {
-  const diffMs = target.getTime() - from.getTime();
-  if (diffMs <= 0) return "now";
-  const totalMinutes = Math.ceil(diffMs / 60_000);
-  const hours = Math.floor(totalMinutes / 60);
-  const minutes = totalMinutes % 60;
-  if (hours === 0) return `${String(minutes)}m`;
-  if (minutes === 0) return `${String(hours)}h`;
-  return `${String(hours)}h ${String(minutes)}m`;
-}
-
 function fmtDate(d: Date): string {
   return (
     d.toLocaleDateString("en-US", {
@@ -1001,74 +985,6 @@ export function formatGoUsageStatusBarText(summary: UsageSummary): string {
   return `Go: ${String(s)}%·${String(w)}%·${String(m)}%${warn}`;
 }
 
-/** Multiline tooltip (VS Code renders newlines in tooltips as-is) */
-export function formatGoUsageTooltip(summary: UsageSummary): vscode.MarkdownString {
-  const md = new vscode.MarkdownString(undefined, true);
-  md.supportThemeIcons = true;
-  md.isTrusted = true;
-
-  md.appendMarkdown("**OpenCode Go — Usage Limits**\n\n");
-
-  for (const [label, period] of [
-    ["Session (5h rolling)", summary.session],
-    ["Weekly (Mon–Mon UTC)", summary.weekly],
-    ["Monthly", summary.monthly],
-  ] as [string, PeriodUsage][]) {
-    const bar = progressBar(period.percent);
-    const icon = percentColor(period.percent);
-    const resets = fmtRelativeTime(period.resetsAt);
-    md.appendMarkdown(
-      `${icon} **${label}**\n\n` +
-        `\`${bar}\` ${String(period.percent)}% · ${fmtUsd(period.spent)} / ${fmtUsd(period.limit)} · resets in ${resets}\n\n`,
-    );
-  }
-
-  md.appendMarkdown("---\n\n");
-  md.appendMarkdown(
-    `$(history) **Today:** ${fmtUsd(summary.today.cost)} · ${fmtTokens(summary.today.tokens)} tokens · ${String(summary.today.requests)} req\n\n`,
-  );
-
-  if (summary.yesterday.requests > 0) {
-    md.appendMarkdown(
-      `$(history) **Yesterday:** ${fmtUsd(summary.yesterday.cost)} · ${fmtTokens(summary.yesterday.tokens)} tokens · ${String(summary.yesterday.requests)} req\n\n`,
-    );
-  }
-
-  md.appendMarkdown("\n$(info) Click for details");
-  return md;
-}
-
-/** Compact plain-text summary used by Language Status popup. */
-export function formatGoUsageLanguageStatusDetail(summary: UsageSummary): string {
-  const now = new Date();
-
-  const sessionLine = [
-    `Session ${String(summary.session.percent)}%`,
-    `${fmtUsd(summary.session.spent)} / ${fmtUsd(summary.session.limit)}`,
-    `resets in ${fmtRelativeTime(summary.session.resetsAt, now)}`,
-  ].join(" · ");
-
-  const weeklyLine = [
-    `Weekly ${String(summary.weekly.percent)}%`,
-    `${fmtUsd(summary.weekly.spent)} / ${fmtUsd(summary.weekly.limit)}`,
-    `resets in ${fmtRelativeTime(summary.weekly.resetsAt, now)}`,
-  ].join(" · ");
-
-  const monthlyLine = [
-    `Monthly ${String(summary.monthly.percent)}%`,
-    `${fmtUsd(summary.monthly.spent)} / ${fmtUsd(summary.monthly.limit)}`,
-    `resets in ${fmtRelativeTime(summary.monthly.resetsAt, now)}`,
-  ].join(" · ");
-
-  const todayLine = [
-    `Today ${fmtUsd(summary.today.cost)}`,
-    `${fmtTokens(summary.today.tokens)} tokens`,
-    `${String(summary.today.requests)} req`,
-  ].join(" · ");
-
-  return [sessionLine, weeklyLine, monthlyLine, todayLine].join("\n");
-}
-
 /** Build Quick Pick items for the usage panel */
 export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer = false): vscode.QuickPickItem[] {
   const now = new Date();
@@ -1076,9 +992,9 @@ export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer
 
   function periodItem(icon: string, label: string, period: PeriodUsage, resetLabel: string): vscode.QuickPickItem {
     const bar = progressBar(period.percent);
-    const spent = fmtUsd(period.spent);
-    const limit = fmtUsd(period.limit);
-    const resets = fmtRelativeTime(period.resetsAt, now);
+    const spent = formatUsd(period.spent);
+    const limit = formatUsd(period.limit);
+    const resets = formatRelativeTime(period.resetsAt, now);
     return {
       label: `${icon} ${label}`,
       description: `${bar} ${String(period.percent)}%`,
@@ -1128,16 +1044,16 @@ export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer
 
   items.push({
     label: `$(history) Today`,
-    description: fmtUsd(summary.today.cost),
-    detail: `${fmtTokens(summary.today.tokens)} tokens · ${String(summary.today.requests)} requests`,
+    description: formatUsd(summary.today.cost),
+    detail: `${formatTokenCount(summary.today.tokens)} tokens · ${String(summary.today.requests)} requests`,
     alwaysShow: true,
   });
 
   if (summary.yesterday.requests > 0 || isEmpty) {
     items.push({
       label: `$(history) Yesterday`,
-      description: fmtUsd(summary.yesterday.cost),
-      detail: `${fmtTokens(summary.yesterday.tokens)} tokens · ${String(summary.yesterday.requests)} requests`,
+      description: formatUsd(summary.yesterday.cost),
+      detail: `${formatTokenCount(summary.yesterday.tokens)} tokens · ${String(summary.yesterday.requests)} requests`,
       alwaysShow: true,
     });
   }
diff --git a/src/imageNormalizer.ts b/src/imageNormalizer.ts
index 2108331..47aad2e 100644
--- a/src/imageNormalizer.ts
+++ b/src/imageNormalizer.ts
@@ -1,8 +1,7 @@
 import type * as Photon from "@silvia-odwyer/photon-node";
+import { MAX_IMAGE_WIDTH, MAX_IMAGE_HEIGHT, MAX_IMAGE_BASE64_BYTES } from "./config";
 
-const MAX_IMAGE_WIDTH = 2_000;
-const MAX_IMAGE_HEIGHT = 2_000;
-export const MAX_IMAGE_BASE64_BYTES = 5 * 1024 * 1024;
+export { MAX_IMAGE_BASE64_BYTES } from "./config";
 const JPEG_QUALITIES = [80, 85, 70, 55, 40] as const;
 
 type PhotonModule = typeof Photon;
diff --git a/src/metadata.ts b/src/metadata.ts
index f105528..f478bd0 100644
--- a/src/metadata.ts
+++ b/src/metadata.ts
@@ -139,14 +139,20 @@ export interface ModelsDevResponse {
   "opencode-go"?: ModelsDevProviderRecord;
 }
 
-export const MODELS_DEV_API_URL = "https://models.dev/api.json";
-export const MODEL_METADATA_REVISION = "session-2026-05-21-b";
-export const MODEL_METADATA_CACHE_KEY = "opencode.modelMetadataCache.v5";
-export const MODEL_METADATA_CACHE_TTL_MS = 1 * 60 * 60 * 1000;
+import {
+  DEFAULT_MODEL_CONTEXT_WINDOW,
+  DEFAULT_MODEL_MAX_OUTPUT_TOKENS,
+  FREE_ZEN_MODEL_IDS,
+  MODEL_METADATA_CACHE_TTL_MS,
+  MODEL_METADATA_REVISION,
+} from "./config";
+import { positiveNumber } from "./utils";
+
+export { MODELS_DEV_API_URL, MODEL_METADATA_REVISION, MODEL_METADATA_CACHE_KEY, MODEL_METADATA_CACHE_TTL_MS } from "./config";
 
 const DEFAULT_MODEL_LIMITS: BaseModelLimits = {
-  contextWindow: 262144,
-  maxOutputTokens: 65536,
+  contextWindow: DEFAULT_MODEL_CONTEXT_WINDOW,
+  maxOutputTokens: DEFAULT_MODEL_MAX_OUTPUT_TOKENS,
 };
 
 const MODELS_DEV_PROVIDER_BY_VENDOR: Record<ProviderVendor, keyof ModelsDevResponse> = {
@@ -237,6 +243,10 @@ const MODELS_WITHOUT_TEMPERATURE = new Set([
   "kimi-k2.7-code",
 ]);
 
+export function isFreeModel(modelId: string): boolean {
+  return FREE_ZEN_MODEL_IDS.has(modelId) || modelId.endsWith("-free");
+}
+
 export const VISION_CAPABLE_MODELS = new Set([
   "minimax-m2.7",
   "minimax-m2.5",
@@ -278,11 +288,6 @@ export const VISION_CAPABLE_MODELS = new Set([
   "gpt-5-codex",
   "gpt-5-nano",
   "grok-build-0.1",
-  "kimi-k2.6",
-  "kimi-k2.5",
-  "qwen3.6-plus",
-  "qwen3.6-plus-free",
-  "qwen3.5-plus",
   "gpt-5.6-luna",
 ]);
 
@@ -497,10 +502,6 @@ function detectModalityFlags(
   };
 }
 
-function positiveNumber(value: unknown): number | undefined {
-  return typeof value === "number" && Number.isFinite(value) && value > 0 ? Math.floor(value) : undefined;
-}
-
 function supportsReasoning(modelId: string): boolean {
   return /^(deepseek-|glm-|kimi-|minimax-|qwen3(?:\.|-)|mimo-)/i.test(modelId);
 }
diff --git a/src/modelLimits.ts b/src/modelLimits.ts
index 93d854a..b8fa9d9 100644
--- a/src/modelLimits.ts
+++ b/src/modelLimits.ts
@@ -1,8 +1,5 @@
 import type { BaseModelLimits } from "./metadata";
-
-const UI_OUTPUT_TOKEN_RESERVE = 8192;
-const MIN_TOKEN_ESTIMATE_SAFETY_MARGIN = 64;
-const TOKEN_ESTIMATE_SAFETY_RATIO = 0.12;
+import { UI_OUTPUT_TOKEN_RESERVE, MIN_TOKEN_ESTIMATE_SAFETY_MARGIN, TOKEN_ESTIMATE_SAFETY_RATIO } from "./config";
 
 export interface ModelLimits extends BaseModelLimits {
   advertisedContextWindow: number;
diff --git a/src/retry.ts b/src/retry.ts
index 6156282..1973714 100644
--- a/src/retry.ts
+++ b/src/retry.ts
@@ -17,14 +17,10 @@
  *   retried so real bugs surface instead of being masked by retries.
  */
 
-/** Max retries for a transient 5xx before surfacing the error to the user. */
-export const TRANSIENT_5XX_MAX_RETRIES = 2;
+import { compactErrorCode, positiveNumber } from "./utils";
+import { CONTEXT_RETRY_MIN_SAFETY_TOKENS, CONTEXT_RETRY_SAFETY_RATIO } from "./config";
 
-/** Base backoff for transient 5xx retries (doubles per attempt, max ~8s). */
-export const TRANSIENT_5XX_RETRY_BASE_MS = 1000;
-
-/** Max random jitter added to each backoff to spread concurrent retries. */
-export const TRANSIENT_5XX_RETRY_JITTER_MS = 250;
+export { TRANSIENT_5XX_MAX_RETRIES, TRANSIENT_5XX_RETRY_BASE_MS, TRANSIENT_5XX_RETRY_JITTER_MS } from "./config";
 
 /** Result of attempting to patch a request body for retry. */
 export interface RetryPatch {
@@ -34,9 +30,6 @@ export interface RetryPatch {
   reason: string;
 }
 
-const CONTEXT_RETRY_MIN_SAFETY_TOKENS = 256;
-const CONTEXT_RETRY_SAFETY_RATIO = 0.001;
-
 /**
  * Patterns that indicate a recoverable 400 error caused by an unsupported
  * parameter value. Each pattern has a regex to match the error message and
@@ -209,9 +202,9 @@ function patchContextOverflow(errorMessage: string, body: Record<string, unknown
   const requestedTokens = parseTokenCount(errorMessage.match(/you requested\s*([\d,]+)\s*tokens?/i)?.[1]);
   if (contextWindow === undefined || requestedTokens === undefined) return undefined;
 
-  const outputKey = ["max_tokens", "max_output_tokens", "max_completion_tokens"].find((key) => positiveInteger(body[key]) !== undefined);
+  const outputKey = ["max_tokens", "max_output_tokens", "max_completion_tokens"].find((key) => positiveNumber(body[key]) !== undefined);
   const generationConfig = recordValue(body.generationConfig);
-  const configuredOutput = outputKey ? positiveInteger(body[outputKey]) : positiveInteger(generationConfig?.maxOutputTokens);
+  const configuredOutput = outputKey ? positiveNumber(body[outputKey]) : positiveNumber(generationConfig?.maxOutputTokens);
   if (configuredOutput === undefined) return undefined;
 
   const reportedOutput = parseTokenCount(errorMessage.match(/([\d,]+)\s+in the (?:completion|output)/i)?.[1]);
@@ -238,11 +231,7 @@ function patchContextOverflow(errorMessage: string, body: Record<string, unknown
 
 function parseTokenCount(value: string | undefined): number | undefined {
   if (!value) return undefined;
-  return positiveInteger(Number(value.replaceAll(",", "")));
-}
-
-function positiveInteger(value: unknown): number | undefined {
-  return typeof value === "number" && Number.isFinite(value) && value > 0 ? Math.floor(value) : undefined;
+  return positiveNumber(Number(value.replaceAll(",", "")));
 }
 
 function recordValue(value: unknown): Record<string, unknown> | undefined {
@@ -264,7 +253,3 @@ export function isTransientServerError(status: number, errorDetail: string): boo
   }
   return status >= 500 && /RouterUnavailable/i.test(compactErrorCode(errorDetail));
 }
-
-function compactErrorCode(value: string): string {
-  return value.replace(/[^a-zA-Z]/g, "");
-}
diff --git a/src/streaming.ts b/src/streaming.ts
index b37fbbf..50c1dac 100644
--- a/src/streaming.ts
+++ b/src/streaming.ts
@@ -29,6 +29,7 @@ import {
 } from "./contextWindowHookBridge";
 import { formatUsageLogLine } from "./usage";
 import { parseToolInput, ToolCallAccumulator, type PendingToolCall } from "./toolCallAccumulator";
+import { isRecord, sleepWithCancellation } from "./utils";
 
 export interface StreamRequestOptions {
   url: string;
@@ -295,36 +296,6 @@ function emitThinkingPart(
   }
 }
 
-/**
- * Wait for `ms` milliseconds, aborting early if the token is cancelled.
- *
- * The shared completion path clears the timer and disposes the cancellation
- * listener. A second cancellation check closes the registration race.
- */
-function sleepWithCancellation(ms: number, token: vscode.CancellationToken): Promise<void> {
-  if (token.isCancellationRequested) return Promise.resolve();
-
-  return new Promise((resolve) => {
-    const state: { cancellation?: vscode.Disposable; settled: boolean } = { settled: false };
-    const finish = () => {
-      if (state.settled) return;
-      state.settled = true;
-      clearTimeout(timer);
-      state.cancellation?.dispose();
-      resolve();
-    };
-    const timer = setTimeout(finish, ms);
-    state.cancellation = token.onCancellationRequested(finish);
-
-    // Close the race between the initial check and listener registration.
-    if (state.settled) {
-      state.cancellation.dispose();
-    } else if (token.isCancellationRequested) {
-      finish();
-    }
-  });
-}
-
 async function streamOpenCodeResponse(options: StreamOpenCodeResponseOptions): Promise<void> {
   const controller = new AbortController();
   const startedAt = Date.now();
@@ -1345,11 +1316,10 @@ class AnthropicResponseExtractor {
       return parts;
     }
 
-    // 3. message_delta: contains stop_reason and usage.
+    // 3. message_delta: contains stop_reason and usage. Usage is already
+    //    collected via the onData callback in parseServerSentEvent (which
+    //    updates the real RequestUsageSummary); here we only flush tool calls.
     if (eventType === "message_delta" && delta) {
-      if (isRecord(data.usage)) {
-        updateRequestUsageSummary(this as unknown as RequestUsageSummary, data);
-      }
       if (delta.stop_reason) {
         const toolParts = this.flushToolCalls();
         this.emittedToolCallsCount += toolParts.length;
@@ -1712,7 +1682,3 @@ function updateRequestUsageSummary(summary: RequestUsageSummary, data: unknown):
     summary.finishReason = firstChoice.finish_reason;
   }
 }
-
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return typeof value === "object" && value !== null;
-}
diff --git a/src/usage.ts b/src/usage.ts
index 1c181a7..d8cb78e 100644
--- a/src/usage.ts
+++ b/src/usage.ts
@@ -8,6 +8,8 @@ export interface UsageSnapshot {
   copilotCredits?: number;
 }
 
+import { formatTokenCount } from "./utils";
+
 export interface ProviderUsagePayload {
   prompt_tokens?: number;
   completion_tokens?: number;
@@ -38,19 +40,7 @@ export function hasUsageSnapshot(usage: UsageSnapshot): boolean {
 }
 
 export function formatCompactTokenCount(value: number | undefined): string {
-  if (value === undefined) {
-    return "?";
-  }
-
-  if (value >= 10000) {
-    return `${String(Math.round(value / 1000))}k`;
-  }
-
-  if (value >= 1000) {
-    return `${(value / 1000).toFixed(1)}k`;
-  }
-
-  return String(value);
+  return value === undefined ? "?" : formatTokenCount(value);
 }
 
 export function cacheHitRatio(usage: UsageSnapshot): number | undefined {
diff --git a/src/usageProfile.ts b/src/usageProfile.ts
index 8d5c431..5d4a45f 100644
--- a/src/usageProfile.ts
+++ b/src/usageProfile.ts
@@ -4,12 +4,9 @@
  * @see issue #63
  */
 import * as vscode from "vscode";
+import { PROFILES_REGISTRY_KEY, ACTIVE_PROFILE_KEY, MIGRATED_KEY, LEGACY_FINGERPRINT } from "./config";
 
-export const PROFILES_REGISTRY_KEY = "opencodego.profiles.v1";
-export const ACTIVE_PROFILE_KEY = "opencodego.activeProfile.v1";
-export const MIGRATED_KEY = "opencodego.migratedTo.v1";
-export const LEGACY_SECRET_KEY = "opencodego.apiKey";
-export const LEGACY_FINGERPRINT = "legacy";
+export { PROFILES_REGISTRY_KEY, ACTIVE_PROFILE_KEY, MIGRATED_KEY, LEGACY_SECRET_KEY, LEGACY_FINGERPRINT } from "./config";
 
 export interface UsageProfile {
   fingerprint: string;
@@ -66,29 +63,6 @@ export async function renameProfile(context: vscode.ExtensionContext, fingerprin
   await writeProfiles(context, next);
 }
 
-/**
- * Get or create a profile for the given fingerprint.
- * Labels are assigned sequentially: "Profile 1", "Profile 2", etc.
- */
-export async function getOrCreateProfile(context: vscode.ExtensionContext, fingerprint: string): Promise<UsageProfile> {
-  const profiles = readProfiles(context);
-  const existing = findProfile(profiles, fingerprint);
-  if (existing) {
-    existing.lastSeenAt = Date.now();
-    await writeProfiles(context, profiles);
-    return existing;
-  }
-  const nextNumber = profiles.length + 1;
-  const profile: UsageProfile = {
-    fingerprint,
-    label: `Profile ${String(nextNumber)}`,
-    lastSeenAt: Date.now(),
-  };
-  profiles.push(profile);
-  await writeProfiles(context, profiles);
-  return profile;
-}
-
 /** Read profiles, excluding the legacy fingerprint (which is not a real profile). */
 export function readActiveProfiles(context: vscode.ExtensionContext): UsageProfile[] {
   return readProfiles(context).filter((p) => p.fingerprint !== LEGACY_FINGERPRINT && p.fingerprint !== "");
diff --git a/src/utils.ts b/src/utils.ts
new file mode 100644
index 0000000..b2dd006
--- /dev/null
+++ b/src/utils.ts
@@ -0,0 +1,163 @@
+/**
+ * Shared pure utilities used across the extension.
+ *
+ * CONTRACT: no `vscode` import, no side effects — unit-testable in plain
+ * Node (same convention as `thinking.ts`). Everything here was extracted to
+ * eliminate near-identical copies that existed in several modules.
+ */
+
+/** Narrow a value to a non-null record. */
+export function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}
+
+/** First defined, non-empty string among the candidates. */
+export function firstString(...values: unknown[]): string | undefined {
+  for (const value of values) {
+    if (typeof value === "string" && value.trim()) {
+      return value.trim();
+    }
+  }
+  return undefined;
+}
+
+/**
+ * Collapse an error text to lowercase alphanumerics for robust pattern
+ * matching (whitespace/punctuation differ between gateways and versions).
+ */
+export function compactErrorCode(value: string): string {
+  return value.replace(/[^a-zA-Z0-9]/g, "").toLowerCase();
+}
+
+/** Positive finite number (floored), else undefined. */
+export function positiveNumber(value: unknown): number | undefined {
+  return typeof value === "number" && Number.isFinite(value) && value > 0 ? Math.floor(value) : undefined;
+}
+
+/**
+ * Coerce an unknown config value to a finite number within [min, max],
+ * falling back to `fallback` for anything invalid.
+ */
+export function toFiniteNumber(value: unknown, fallback: number, min = Number.NEGATIVE_INFINITY, max = Number.POSITIVE_INFINITY): number {
+  return typeof value === "number" && Number.isFinite(value) ? Math.min(max, Math.max(min, value)) : fallback;
+}
+
+/** Human-readable error text for any thrown value. */
+export function getErrorMessage(error: unknown): string {
+  return error instanceof Error ? error.message : String(error);
+}
+
+/** Parse a JSON string safely; returns undefined on any failure. */
+export function parseJsonSafe(text: string): unknown {
+  try {
+    return JSON.parse(text) as unknown;
+  } catch {
+    return undefined;
+  }
+}
+
+// ─── Formatting helpers ──────────────────────────────────────────────────────
+
+/** `$12.30`-style fixed two-decimal currency. */
+export function formatUsd(value: number): string {
+  return `$${value.toFixed(2)}`;
+}
+
+/**
+ * Compact human token count: 1.2M / 12k / 1.2k / raw number.
+ * Rounds at >= 10k for a shorter status-bar label.
+ */
+export function formatTokenCount(value: number): string {
+  if (value >= 1_000_000) return `${(value / 1_000_000).toFixed(1)}M`;
+  if (value >= 10_000) return `${Math.round(value / 1_000)}k`;
+  if (value >= 1_000) return `${(value / 1_000).toFixed(1)}k`;
+  return String(value);
+}
+
+/** Compact relative time ("now", "5m", "3h", "3h 20m", "2d 4h"). */
+export function formatRelativeTime(target: Date, from: Date = new Date()): string {
+  const diffMs = target.getTime() - from.getTime();
+  if (diffMs <= 0) return "now";
+  const totalMinutes = Math.ceil(diffMs / 60_000);
+  const hours = Math.floor(totalMinutes / 60);
+  const minutes = totalMinutes % 60;
+  if (hours === 0) return `${String(minutes)}m`;
+  if (minutes === 0) return `${String(hours)}h`;
+  if (hours >= 24) {
+    const days = Math.floor(hours / 24);
+    const remainingHours = hours % 24;
+    return remainingHours === 0 ? `${String(days)}d` : `${String(days)}d ${String(remainingHours)}h`;
+  }
+  return `${String(hours)}h ${String(minutes)}m`;
+}
+
+/** Escape a value for embedding in HTML/SVG text content. */
+export function escapeHtml(value: string): string {
+  return value.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;");
+}
+
+// ─── Async helpers ───────────────────────────────────────────────────────────
+
+/** Structural subset of vscode.CancellationToken — keeps this module pure. */
+export interface LikeCancellationToken {
+  readonly isCancellationRequested: boolean;
+  onCancellationRequested(listener: () => unknown): { dispose(): void };
+}
+
+/**
+ * Delay for `ms`, rejecting with an AbortError when the token fires.
+ * Used for retry backoff that must bail out of the retry loop on cancel.
+ */
+export function sleep(ms: number, token?: LikeCancellationToken): Promise<void> {
+  if (token?.isCancellationRequested) {
+    return Promise.reject(new DOMException("Aborted", "AbortError"));
+  }
+  return new Promise((resolve, reject) => {
+    const state: { timer?: ReturnType<typeof setTimeout>; subscription?: { dispose(): void } } = {};
+    const finish = (cancelled: boolean): void => {
+      if (state.timer) clearTimeout(state.timer);
+      state.subscription?.dispose();
+      if (cancelled) {
+        reject(new DOMException("Aborted", "AbortError"));
+      } else {
+        resolve();
+      }
+    };
+    state.timer = setTimeout(() => {
+      finish(false);
+    }, ms);
+    if (token) {
+      state.subscription = token.onCancellationRequested(() => {
+        finish(true);
+      });
+    }
+  });
+}
+
+/**
+ * Delay for `ms`, resolving early (without error) when the token fires.
+ * Used for backoff waits where cancellation is a normal short-circuit.
+ */
+export function sleepWithCancellation(ms: number, token: LikeCancellationToken): Promise<void> {
+  if (token.isCancellationRequested) return Promise.resolve();
+
+  return new Promise((resolve) => {
+    const state: { cancellation?: { dispose(): void }; settled: boolean } = { settled: false };
+    const finish = (): void => {
+      if (state.settled) return;
+      state.settled = true;
+      clearTimeout(timer);
+      state.cancellation?.dispose();
+      resolve();
+    };
+    const timer = setTimeout(finish, ms);
+    state.cancellation = token.onCancellationRequested(finish);
+
+    // Close the race between the initial check and listener registration.
+    if (state.settled) {
+      state.cancellation.dispose();
+    } else if (token.isCancellationRequested) {
+      finish();
+    }
+  });
+}
diff --git a/src/visionProxyCache.ts b/src/visionProxyCache.ts
index 3207583..e486a26 100644
--- a/src/visionProxyCache.ts
+++ b/src/visionProxyCache.ts
@@ -1,4 +1,7 @@
 import { createHash } from "node:crypto";
+import { IMAGE_DESCRIPTION_CACHE_LIMIT } from "./config";
+
+export { IMAGE_DESCRIPTION_CACHE_LIMIT } from "./config";
 
 /**
  * Cache mapping an image's content hash to the text description produced by
@@ -21,9 +24,6 @@ import { createHash } from "node:crypto";
  */
 export const imageDescriptionCache = new Map<string, string>();
 
-/** Cap on cache entries to prevent unbounded memory growth across sessions. */
-export const IMAGE_DESCRIPTION_CACHE_LIMIT = 200;
-
 /**
  * Stable key for an image's bytes. We hash the base64 string (as produced by
  * `dataPartToBase64`) rather than keeping the string itself, which keeps memory

From 88ca11a3e44f0aae863956ab5bd083ee73ad0955 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 08:53:47 +0500
Subject: [PATCH 18/43] refactor(streaming): share BaseResponseExtractor +
 verify scripts against real logic

- Both stream extractors now extend a common BaseResponseExtractor holding
  the shared reasoning accounting, think-tag filtering, live thinking-part
  emission and end-of-stream fallback (previously duplicated verbatim).
- scripts/verify-estimate-token-count.ts now imports the REAL
  estimateTokenCount and calculateModelLimits instead of a drifted copy,
  so it can never disagree with production again; payload ratio aligned
  with the estimator's ~4.4 chars/token.
- scripts/validate-models.ts builds its default thinking settings from
  THINKING_DEFAULTS instead of a duplicated literal.
- goUsageTracker.buildSummaryFromRows no longer reports a misleading
  sqliteAvailable flag (caller already overrides it).
---
 scripts/validate-models.ts             |  13 +-
 scripts/verify-estimate-token-count.ts |  40 ++-
 src/goUsageTracker.ts                  |  11 +-
 src/streaming.ts                       | 332 ++++++++++---------------
 4 files changed, 149 insertions(+), 247 deletions(-)

diff --git a/scripts/validate-models.ts b/scripts/validate-models.ts
index 9c7bec9..f948dfd 100644
--- a/scripts/validate-models.ts
+++ b/scripts/validate-models.ts
@@ -121,16 +121,9 @@ function detectFamily(id: string): string {
 // Build test parameters using extension's buildThinkingPayload
 // ---------------------------------------------------------------------------
 
-const DEFAULT_SETTINGS: ThinkingSettings = {
-  deepseek: "off",
-  glm: "off",
-  kimi: "off",
-  minimax: "off",
-  openai: "off",
-  qwen: "off",
-  qwenBudget: "auto",
-  mimo: "off",
-};
+import { THINKING_DEFAULTS } from "../src/config.js";
+
+const DEFAULT_SETTINGS: ThinkingSettings = { ...THINKING_DEFAULTS };
 
 function buildThinkingTests(model: ModelInfo): ParamTest[] {
   const id = model.id;
diff --git a/scripts/verify-estimate-token-count.ts b/scripts/verify-estimate-token-count.ts
index 573339a..c24b3ea 100644
--- a/scripts/verify-estimate-token-count.ts
+++ b/scripts/verify-estimate-token-count.ts
@@ -7,22 +7,13 @@
  * Run: npx tsx scripts/verify-estimate-token-count.ts
  */
 
-// ── Heuristic under test (same logic as extension.ts after fix) ──────────────
+// ── Heuristic under test (the REAL production estimator) ────────────────────
+// Imported from src/ so this script can never drift from what the extension
+// actually runs. The `old` variant below is kept as a historical comparison.
 
-function estimateTokenCount(value: string): number {
-  if (!value) return 0;
-
-  const normalized = value.replace(/\s+/g, " ").trim();
-  if (!normalized) return 0;
-
-  const cjkCharacters = normalized.match(/[\u3040-\u30ff\u3400-\u9fff\uf900-\ufaff]/gu)?.length ?? 0;
-  const charEstimate = Math.ceil(normalized.length / 4);
-  const codeBuffer = Math.ceil(charEstimate * 0.1);
+import { estimateTokenCount } from "../src/tokenEstimate.js";
 
-  return Math.max(1, Math.ceil(charEstimate + codeBuffer + cjkCharacters));
-}
-
-// ── Old heuristic (for comparison) ───────────────────────────────────────────
+// ── Old heuristic (historical copy, for comparison only) ────────────────────
 
 function oldEstimateTokenCount(value: string): number {
   if (!value) return 0;
@@ -62,10 +53,11 @@ interface TestCase {
  * for JSON-heavy payloads because structural characters inflate the word count.
  */
 function generateChatPayload(targetTokens: number, hasToolCalls: boolean): string {
-  // At 1 token ≈ 4 chars for English, targetChars ≈ targetTokens * 4
-  // But JSON structure adds overhead (brackets, quotes, commas), so we need
-  // more characters. Actual ratio for JSON chat: ~5-6 chars/token
-  const targetChars = Math.floor(targetTokens * 5.5);
+  // At 1 token ≈ 4 chars for English prose/code, targetChars ≈ targetTokens * 4.
+  // The production estimator charges exactly ~4.4 chars/token (n/4 + 10%), so
+  // generating at a higher ratio would overstate the estimate and make the
+  // budget collapse artificially. 4.3 keeps a small margin for JSON syntax.
+  const targetChars = Math.floor(targetTokens * 4.3);
 
   const messages: string[] = [];
   // System prompt
@@ -328,18 +320,18 @@ const testCases: TestCase[] = [
 ];
 
 // ── Verification logic ───────────────────────────────────────────────────────
+// The "new" budget is computed with the production calculateModelLimits so the
+// script verifies the real shipped behavior.
 
-const MIN_OUTPUT_BUDGET = 4096;
-const TOKEN_ESTIMATE_SAFETY_MARGIN = 64;
+import { calculateModelLimits } from "../src/modelLimits.js";
 
 function computeMaxTokens(promptTokens: number | undefined, contextWindow: number, maxOutputTokens: number): number {
-  const promptReserve = (promptTokens ?? Math.floor(contextWindow * 0.8)) + TOKEN_ESTIMATE_SAFETY_MARGIN;
-  const safeOutputBudget = Math.max(MIN_OUTPUT_BUDGET, contextWindow - promptReserve);
-  return Math.min(maxOutputTokens, safeOutputBudget);
+  const limits = calculateModelLimits({ contextWindow, maxOutputTokens }, { maxInputTokens: contextWindow, promptTokens });
+  return limits.maxOutputTokens;
 }
 
 function computeMaxTokensOld(promptTokens: number | undefined, contextWindow: number, maxOutputTokens: number): number {
-  const promptReserve = (promptTokens ?? Math.floor(contextWindow * 0.8)) + TOKEN_ESTIMATE_SAFETY_MARGIN;
+  const promptReserve = (promptTokens ?? Math.floor(contextWindow * 0.8)) + 64;
   const safeOutputBudget = Math.max(1, contextWindow - promptReserve);
   return Math.min(maxOutputTokens, safeOutputBudget);
 }
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index e86ff9c..84beeaa 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -521,7 +521,7 @@ export class GoUsageTracker {
 
   /** Build summary from SQLite, enriched with token/request counts from tracked entries. */
   private buildSqliteEnrichedSummary(nowMs: number, rows: HistoryRow[], clamp: (v: number, limit: number) => number): UsageSummary {
-    const base = this.buildSummaryFromRows(nowMs, rows, clamp, true);
+    const base = this.buildSummaryFromRows(nowMs, rows, clamp);
 
     // Enrich today/yesterday tokens+requests from tracked entries (SQLite doesn't store tokens).
     const dayMs = startOfUtcDay(nowMs);
@@ -567,12 +567,7 @@ export class GoUsageTracker {
   }
 
   /** Build summary from opencode.db rows (enrichment data from CLI history) */
-  private buildSummaryFromRows(
-    nowMs: number,
-    rows: HistoryRow[],
-    clamp: (v: number, limit: number) => number,
-    hasData: boolean,
-  ): UsageSummary {
+  private buildSummaryFromRows(nowMs: number, rows: HistoryRow[], clamp: (v: number, limit: number) => number): UsageSummary {
     const dayMs = startOfUtcDay(nowMs);
     const yesterdayMs = dayMs - 24 * 60 * 60 * 1000;
     const weekMs = startOfUtcWeek(nowMs);
@@ -642,7 +637,7 @@ export class GoUsageTracker {
         requests: yestReq,
         tokens: 0,
       },
-      hasData,
+      hasData: true,
       sqliteAvailable: false,
     };
   }
diff --git a/src/streaming.ts b/src/streaming.ts
index 50c1dac..99db0da 100644
--- a/src/streaming.ts
+++ b/src/streaming.ts
@@ -840,19 +840,114 @@ class ThinkTagFilter {
   }
 }
 
-class OpenAiResponseExtractor {
-  private readonly toolCallAccumulator = new ToolCallAccumulator();
-  private reasoningContent = "";
-  private emittedTextLength = 0;
-  private emittedToolCallsCount = 0;
+/**
+ * Shared state + behavior for the OpenAI- and Anthropic-style stream
+ * extractors: text/reasoning accounting, think-tag filtering, live reasoning
+ * emission, and the end-of-stream reasoning fallback.
+ */
+abstract class BaseResponseExtractor {
+  protected reasoningContent = "";
+  protected emittedTextLength = 0;
+  protected emittedToolCallsCount = 0;
   /**
-   * Total reasoning characters seen across the entire stream. Unlike
-   * `reasoningContent` (which is cleared by flushToolCalls/flushReasoningFallback
-   * for tool-call replication), this counter is monotonically increasing and
+   * Total reasoning characters seen across the entire stream (monotonic).
+   * Unlike `reasoningContent` (cleared by tool-call flushes), this counter is
    * used for the [stream-summary] log line so metrics stay accurate.
    */
-  private totalReasoningChars = 0;
+  protected totalReasoningChars = 0;
+
+  constructor(
+    protected readonly onReasoningContent?: (toolCallIds: string[], reasoningContent: string) => void,
+    protected readonly onReasoningDebug?: (reasoningContent: string) => void,
+    protected readonly thinkFilter?: ThinkTagFilter,
+    protected readonly progress?: vscode.Progress<vscode.LanguageModelResponsePart2>,
+    protected readonly localRequestId?: string,
+    protected readonly output?: vscode.OutputChannel,
+  ) {}
+
+  get emittedText(): number {
+    return this.emittedTextLength;
+  }
+
+  get emittedTools(): number {
+    return this.emittedToolCallsCount;
+  }
+
+  get reasoningChars(): number {
+    return this.totalReasoningChars;
+  }
+
+  /** Split text through the think-tag filter (if active). */
+  protected filterText(text: string): { visible: string; thinking: string } {
+    if (!text) {
+      return { visible: "", thinking: "" };
+    }
+    if (!this.thinkFilter) {
+      return { visible: text, thinking: "" };
+    }
+    return this.thinkFilter.process(text);
+  }
+
+  /**
+   * Accumulate reasoning for tool-call replication and — when the thinking
+   * part API is available — stream it live to the Copilot Chat UI as
+   * `LanguageModelThinkingPart` so `chat.agent.thinkingStyle` applies.
+   */
+  protected handleReasoning(reasoning: string): string {
+    if (!reasoning) {
+      return "";
+    }
+    this.reasoningContent += reasoning;
+    this.totalReasoningChars += reasoning.length;
+    if (this.progress) {
+      emitThinkingPart(this.localRequestId, this.progress, reasoning);
+    }
+    return reasoning;
+  }
+
+  /** Emit the shared end-of-stream reasoning fallback. */
+  flushReasoningFallback(progress: vscode.Progress<vscode.LanguageModelResponsePart2>, localRequestId?: string): void {
+    // Flush any remaining text in the think filter
+    if (this.thinkFilter) {
+      const { visible, thinking } = this.thinkFilter.finish();
+      if (visible) {
+        this.emittedTextLength += visible.length;
+        reportProgressPart(localRequestId, progress, new vscode.LanguageModelTextPart(visible));
+      }
+      if (thinking) {
+        // Surface remaining think-filter carry through the thinking part channel.
+        this.handleReasoning(thinking);
+      }
+    }
+
+    const reasoning = this.reasoningContent.trim();
+    if (!reasoning) {
+      return;
+    }
+    // If the thinking part API is available, reasoning was already streamed
+    // live during extractStreamParts via handleReasoning(). The accumulated
+    // reasoningContent is retained only for tool-call replication
+    // (flushToolCalls → onReasoningContent). Nothing more to emit here.
+    if (thinkingPartConstructor) {
+      this.reasoningContent = "";
+      return;
+    }
+    // Legacy fallback (API unavailable): emit reasoning as plain text only
+    // when the response is otherwise empty, to avoid breaking the visible
+    // output. This preserves the pre-fix safety-net semantics.
+    if (this.emittedTextLength > 0 || this.emittedToolCallsCount > 0) {
+      this.reasoningContent = "";
+      return;
+    }
+    this.onReasoningDebug?.(this.reasoningContent);
+    reportProgressPart(localRequestId, progress, new vscode.LanguageModelTextPart(reasoning));
+    this.emittedTextLength += reasoning.length;
+    this.reasoningContent = "";
+  }
+}
 
+class OpenAiResponseExtractor extends BaseResponseExtractor {
+  private readonly toolCallAccumulator = new ToolCallAccumulator();
   /**
    * Reasoning loop suppression state.
    *
@@ -869,23 +964,16 @@ class OpenAiResponseExtractor {
    */
   private readonly reasoningFragmentSuffixes: string[] = [];
   private static readonly REASONING_LOOP_SUFFIX_MATCHES = 6;
+  /** Reasoning emitted as visible text (gateway bug #37635, thinking OFF). */
+  private reasoningAsContent = "";
 
   constructor(
-    private readonly onReasoningContent?: (toolCallIds: string[], reasoningContent: string) => void,
-    private readonly onReasoningDebug?: (reasoningContent: string) => void,
-    private readonly thinkFilter?: ThinkTagFilter,
-    /**
-     * Progress reporter used to stream reasoning chunks to the Copilot Chat UI
-     * as `LanguageModelThinkingPart`. When provided (together with
-     * `localRequestId`), reasoning is surfaced live so that
-     * `chat.agent.thinkingStyle` applies (fixes #22, #71).
-     */
-    private readonly progress?: vscode.Progress<vscode.LanguageModelResponsePart2>,
-    private readonly localRequestId?: string,
-    /**
-     * Optional output channel for debug logging.
-     */
-    private readonly output?: vscode.OutputChannel,
+    onReasoningContent?: (toolCallIds: string[], reasoningContent: string) => void,
+    onReasoningDebug?: (reasoningContent: string) => void,
+    thinkFilter?: ThinkTagFilter,
+    progress?: vscode.Progress<vscode.LanguageModelResponsePart2>,
+    localRequestId?: string,
+    output?: vscode.OutputChannel,
     /**
      * Workaround for opencode-go gateway bug (#37635).
      *
@@ -901,18 +989,8 @@ class OpenAiResponseExtractor {
      * - Zen gateway and all non-Go models are never affected.
      */
     private readonly treatReasoningAsContent = false,
-  ) {}
-
-  get emittedText(): number {
-    return this.emittedTextLength;
-  }
-
-  get emittedTools(): number {
-    return this.emittedToolCallsCount;
-  }
-
-  get reasoningChars(): number {
-    return this.totalReasoningChars;
+  ) {
+    super(onReasoningContent, onReasoningDebug, thinkFilter, progress, localRequestId, output);
   }
 
   /** Whether the reasoning loop suppression was triggered. */
@@ -920,19 +998,6 @@ class OpenAiResponseExtractor {
     return this._reasoningLoopSuppressed;
   }
 
-  /**
-   * Accumulate reasoning for tool-call replication, and — when the thinking
-   * part API is available — stream it live to the Copilot Chat UI.
-   *
-   * Also detects reasoning loops: if total reasoning chars exceeds a threshold
-   * without any visible text or tool calls being emitted, the model is likely
-   * stuck and further thinking parts are suppressed.
-   *
-   * Returns the reasoning string that was handled (for logging/debug).
-   */
-  /** Reasoning emitted as visible text (gateway bug #37635, thinking OFF). */
-  private reasoningAsContent = "";
-
   /**
    * Emit an internal marker part carrying the reasoning that was surfaced as
    * visible text, so the next turn can echo it back as reasoning_content.
@@ -947,14 +1012,21 @@ class OpenAiResponseExtractor {
     return part;
   }
 
-  private handleReasoning(reasoning: string): string {
+  /**
+   * Accumulate reasoning for tool-call replication, and — when the thinking
+   * part API is available — stream it live to the Copilot Chat UI.
+   *
+   * Also detects reasoning loops: if the same 40-char suffix repeats across
+   * 6+ consecutive chunks, the model is stuck and further thinking parts are
+   * suppressed (accumulation continues for tool-call replication).
+   */
+  override handleReasoning(reasoning: string): string {
     if (!reasoning) {
       return "";
     }
     this.reasoningContent += reasoning;
     this.totalReasoningChars += reasoning.length;
 
-    // Reasoning loop guard: suppress if suffix repetition detected
     if (this.shouldSuppressThinkingEmit(reasoning)) {
       // Accumulate but don't emit — loop detected
       return reasoning;
@@ -976,10 +1048,6 @@ class OpenAiResponseExtractor {
    * chunks. This catches actual word-level repetition loops without false
    * positives on fresh conversations where the model legitimately reasons
    * for thousands of chars before producing output.
-   *
-   * A char-budget guard was previously used but removed because it triggered
-   * false positives on normal fresh conversations (model can legitimately
-   * produce 3000+ thinking chars before visible output or tool calls).
    */
   private shouldSuppressThinkingEmit(chunk: string): boolean {
     if (this._reasoningLoopSuppressed) {
@@ -992,7 +1060,7 @@ class OpenAiResponseExtractor {
       const lastSuffix = this.reasoningFragmentSuffixes.at(-1);
       if (lastSuffix !== undefined && suffix === lastSuffix) {
         this.reasoningFragmentSuffixes.push(suffix);
-        if (this.reasoningFragmentSuffixes.length >= 6) {
+        if (this.reasoningFragmentSuffixes.length >= OpenAiResponseExtractor.REASONING_LOOP_SUFFIX_MATCHES) {
           this._reasoningLoopSuppressed = true;
           this.output?.appendLine(`[mimo] reasoning loop: suffix repeated 6x. Suppressing thinking parts.`);
         }
@@ -1085,18 +1153,7 @@ class OpenAiResponseExtractor {
     return parts;
   }
 
-  /** Split text through the think-tag filter (if active). */
-  private filterText(text: string): { visible: string; thinking: string } {
-    if (!text) {
-      return { visible: "", thinking: "" };
-    }
-    if (!this.thinkFilter) {
-      return { visible: text, thinking: "" };
-    }
-    return this.thinkFilter.process(text);
-  }
-
-  flushReasoningFallback(progress: vscode.Progress<vscode.LanguageModelResponsePart2>, localRequestId?: string): void {
+  override flushReasoningFallback(progress: vscode.Progress<vscode.LanguageModelResponsePart2>, localRequestId?: string): void {
     // Emit a visible warning if a reasoning loop was detected and suppressed
     if (this._reasoningLoopSuppressed && !this.reasoningLoopWarningEmitted) {
       this.reasoningLoopWarningEmitted = true;
@@ -1104,43 +1161,7 @@ class OpenAiResponseExtractor {
       reportProgressPart(localRequestId, progress, new vscode.LanguageModelTextPart(warning));
       this.emittedTextLength += warning.length;
     }
-
-    // Flush any remaining text in the think filter
-    if (this.thinkFilter) {
-      const { visible, thinking } = this.thinkFilter.finish();
-      if (visible) {
-        this.emittedTextLength += visible.length;
-        reportProgressPart(localRequestId, progress, new vscode.LanguageModelTextPart(visible));
-      }
-      if (thinking) {
-        // Surface remaining think-filter carry through the thinking part channel.
-        this.handleReasoning(thinking);
-      }
-    }
-
-    const reasoning = this.reasoningContent.trim();
-    if (!reasoning) {
-      return;
-    }
-    // If the thinking part API is available, reasoning was already streamed
-    // live during extractStreamParts via handleReasoning(). The accumulated
-    // reasoningContent is retained only for tool-call replication
-    // (flushToolCalls → onReasoningContent). Nothing more to emit here.
-    if (thinkingPartConstructor) {
-      this.reasoningContent = "";
-      return;
-    }
-    // Legacy fallback (API unavailable): emit reasoning as plain text only
-    // when the response is otherwise empty, to avoid breaking the visible
-    // output. This preserves the pre-fix safety-net semantics.
-    if (this.emittedTextLength > 0 || this.emittedToolCallsCount > 0) {
-      this.reasoningContent = "";
-      return;
-    }
-    this.onReasoningDebug?.(this.reasoningContent);
-    reportProgressPart(localRequestId, progress, new vscode.LanguageModelTextPart(reasoning));
-    this.emittedTextLength += reasoning.length;
-    this.reasoningContent = "";
+    super.flushReasoningFallback(progress, localRequestId);
   }
 
   private collectOpenAiToolCalls(toolCalls: unknown): void {
@@ -1187,57 +1208,8 @@ class OpenAiResponseExtractor {
   }
 }
 
-class AnthropicResponseExtractor {
+class AnthropicResponseExtractor extends BaseResponseExtractor {
   private readonly pendingToolCalls = new Map<number, PendingToolCall>();
-  private reasoningContent = "";
-  private emittedTextLength = 0;
-  private emittedToolCallsCount = 0;
-  /**
-   * Total reasoning characters seen across the entire stream (monotonic).
-   * See OpenAiResponseExtractor.totalReasoningChars for rationale.
-   */
-  private totalReasoningChars = 0;
-
-  constructor(
-    private readonly onReasoningContent?: (toolCallIds: string[], reasoningContent: string) => void,
-    private readonly onReasoningDebug?: (reasoningContent: string) => void,
-    private readonly thinkFilter?: ThinkTagFilter,
-    /**
-     * Progress reporter used to stream reasoning chunks to the Copilot Chat UI
-     * as `LanguageModelThinkingPart`. See OpenAiResponseExtractor for contract.
-     */
-    private readonly progress?: vscode.Progress<vscode.LanguageModelResponsePart2>,
-    private readonly localRequestId?: string,
-  ) {}
-
-  get emittedText(): number {
-    return this.emittedTextLength;
-  }
-
-  get emittedTools(): number {
-    return this.emittedToolCallsCount;
-  }
-
-  get reasoningChars(): number {
-    return this.totalReasoningChars;
-  }
-
-  /**
-   * Accumulate reasoning for tool-call replication, and — when the thinking
-   * part API is available — stream it live to the Copilot Chat UI.
-   * Mirror of OpenAiResponseExtractor.handleReasoning.
-   */
-  private handleReasoning(reasoning: string): string {
-    if (!reasoning) {
-      return "";
-    }
-    this.reasoningContent += reasoning;
-    this.totalReasoningChars += reasoning.length;
-    if (this.progress) {
-      emitThinkingPart(this.localRequestId, this.progress, reasoning);
-    }
-    return reasoning;
-  }
 
   extractStreamParts(data: unknown): vscode.LanguageModelResponsePart[] {
     if (!isRecord(data)) {
@@ -1395,56 +1367,6 @@ class AnthropicResponseExtractor {
     return parts;
   }
 
-  /** Split text through the think-tag filter (if active). */
-  private filterText(text: string): { visible: string; thinking: string } {
-    if (!text) {
-      return { visible: "", thinking: "" };
-    }
-    if (!this.thinkFilter) {
-      return { visible: text, thinking: "" };
-    }
-    return this.thinkFilter.process(text);
-  }
-
-  flushReasoningFallback(progress: vscode.Progress<vscode.LanguageModelResponsePart2>, localRequestId?: string): void {
-    // Flush any remaining text in the think filter
-    if (this.thinkFilter) {
-      const { visible, thinking } = this.thinkFilter.finish();
-      if (visible) {
-        this.emittedTextLength += visible.length;
-        reportProgressPart(localRequestId, progress, new vscode.LanguageModelTextPart(visible));
-      }
-      if (thinking) {
-        // Surface remaining think-filter carry through the thinking part channel.
-        this.handleReasoning(thinking);
-      }
-    }
-
-    const reasoning = this.reasoningContent.trim();
-    if (!reasoning) {
-      return;
-    }
-    // If the thinking part API is available, reasoning was already streamed
-    // live during extractStreamParts via handleReasoning(). The accumulated
-    // reasoningContent is retained only for tool-call replication
-    // (flushToolCalls → onReasoningContent). Nothing more to emit here.
-    if (thinkingPartConstructor) {
-      this.reasoningContent = "";
-      return;
-    }
-    // Legacy fallback (API unavailable): emit reasoning as plain text only
-    // when the response is otherwise empty, to avoid breaking the visible
-    // output. This preserves the pre-fix safety-net semantics.
-    if (this.emittedTextLength > 0 || this.emittedToolCallsCount > 0) {
-      this.reasoningContent = "";
-      return;
-    }
-    this.onReasoningDebug?.(this.reasoningContent);
-    reportProgressPart(localRequestId, progress, new vscode.LanguageModelTextPart(reasoning));
-    this.emittedTextLength += reasoning.length;
-    this.reasoningContent = "";
-  }
-
   private flushToolCalls(): vscode.LanguageModelToolCallPart[] {
     const toolCalls = Array.from(this.pendingToolCalls.values()).filter((toolCall) => toolCall.name);
     const parts = toolCalls.map(

From a56ae08a8752afbcf7e04e95c853bcb74ab7f96d Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 08:56:01 +0500
Subject: [PATCH 19/43] refactor: sweep remaining duplicated error extraction +
 storage-key literals

- All inline 'error instanceof Error ? message : String(error)' now go
  through utils.getErrorMessage (bridge, streaming, hook, diagnostics,
  provider diagnostics).
- contextWindowHook's local isRecord replaced by the shared util.
- goUsageTracker tests reference GO_USAGE_LOG_KEY / BASELINE / SESSION_COSTS
  / idle & session-cap constants instead of hardcoded literals, so the tests
  can never drift from config.
---
 src/contextWindowHook.ts        |  8 ++------
 src/contextWindowHookBridge.ts  |  4 ++--
 src/extension.ts                |  8 +++-----
 src/runtimeDiagnostics.ts       |  3 ++-
 src/streaming.ts                |  4 ++--
 src/test/goUsageTracker.test.ts | 23 ++++++++++++-----------
 6 files changed, 23 insertions(+), 27 deletions(-)

diff --git a/src/contextWindowHook.ts b/src/contextWindowHook.ts
index 9439965..ae4489f 100644
--- a/src/contextWindowHook.ts
+++ b/src/contextWindowHook.ts
@@ -1,6 +1,7 @@
 import { AsyncLocalStorage } from "node:async_hooks";
 import * as vscode from "vscode";
 import type { UsageSnapshot } from "./usage";
+import { getErrorMessage, isRecord } from "./utils";
 
 type HandleProgressChunkFn = (requestId: string, chunks: unknown[]) => Promise<void>;
 
@@ -182,8 +183,7 @@ async function captureProxy(logDiagnostic?: (message: string) => void): Promise<
     participant = vscode.chat.createChatParticipant(probeId, () => undefined);
     await new Promise((resolve) => setTimeout(resolve, 150));
   } catch (error) {
-    const message = error instanceof Error ? error.message : String(error);
-    logDiagnostic?.(`contextWindowHook: probe participant creation failed — ${message}`);
+    logDiagnostic?.(`contextWindowHook: probe participant creation failed — ${getErrorMessage(error)}`);
   } finally {
     participant?.dispose();
     Map.prototype.set = originalMapSet;
@@ -482,7 +482,3 @@ export async function initializeContextWindowHook(logDiagnostic?: (message: stri
   logDiagnostic?.("contextWindowHook: proxy captured and patched successfully");
   return true;
 }
-
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return typeof value === "object" && value !== null;
-}
diff --git a/src/contextWindowHookBridge.ts b/src/contextWindowHookBridge.ts
index 25882b1..a372f68 100644
--- a/src/contextWindowHookBridge.ts
+++ b/src/contextWindowHookBridge.ts
@@ -1,5 +1,6 @@
 import type { LanguageModelResponsePart2, Progress } from "vscode";
 import type { UsageSnapshot } from "./usage";
+import { getErrorMessage } from "./utils";
 
 type ContextWindowHookModule = typeof import("./contextWindowHook.js");
 
@@ -57,8 +58,7 @@ async function loadContextWindowHookModule(logDiagnostic?: (message: string) =>
         return hookModule;
       })
       .catch((error: unknown) => {
-        const message = error instanceof Error ? error.message : String(error);
-        logDiagnostic?.(`contextWindowHook: failed to import hook module — ${message}`);
+        logDiagnostic?.(`contextWindowHook: failed to import hook module — ${getErrorMessage(error)}`);
         loadingContextWindowHookModule = undefined;
         return null;
       });
diff --git a/src/extension.ts b/src/extension.ts
index ad639ac..82b0cdb 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -2772,11 +2772,9 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
   }
 
   private errMsg(error: unknown): string {
-    if (error instanceof Error) {
-      const cause = (error as { cause?: { code?: string; name?: string; message?: string } }).cause;
-      return cause?.code ? `${error.message} [${cause.code}]` : error.message;
-    }
-    return String(error);
+    const message = getErrorMessage(error);
+    const cause = (error as { cause?: { code?: string; name?: string; message?: string } } | null | undefined)?.cause;
+    return cause?.code ? `${message} [${cause.code}]` : message;
   }
 
   /**
diff --git a/src/runtimeDiagnostics.ts b/src/runtimeDiagnostics.ts
index 0cea633..db4dccc 100644
--- a/src/runtimeDiagnostics.ts
+++ b/src/runtimeDiagnostics.ts
@@ -1,5 +1,6 @@
 import { execFileSync } from "node:child_process";
 import * as vscode from "vscode";
+import { getErrorMessage } from "./utils";
 
 export function runtimeDiagnosticsLines(context: vscode.ExtensionContext): string[] {
   const packageJson = context.extension.packageJSON as { version?: unknown };
@@ -51,6 +52,6 @@ function windowsIntegrityLevel(): string {
     if (/S-1-16-4096/i.test(groups)) return "low";
     return "unknown";
   } catch (error) {
-    return `unavailable (${error instanceof Error ? error.message : String(error)})`;
+    return `unavailable (${getErrorMessage(error)})`;
   }
 }
diff --git a/src/streaming.ts b/src/streaming.ts
index 99db0da..9afa3e6 100644
--- a/src/streaming.ts
+++ b/src/streaming.ts
@@ -29,7 +29,7 @@ import {
 } from "./contextWindowHookBridge";
 import { formatUsageLogLine } from "./usage";
 import { parseToolInput, ToolCallAccumulator, type PendingToolCall } from "./toolCallAccumulator";
-import { isRecord, sleepWithCancellation } from "./utils";
+import { getErrorMessage, isRecord, sleepWithCancellation } from "./utils";
 
 export interface StreamRequestOptions {
   url: string;
@@ -641,7 +641,7 @@ async function streamOpenCodeResponse(options: StreamOpenCodeResponseOptions): P
       throw requestError;
     }
     emitSummary(0, 0, {
-      errorMessage: error instanceof Error ? error.message : String(error),
+      errorMessage: getErrorMessage(error),
     });
     throw error;
   } finally {
diff --git a/src/test/goUsageTracker.test.ts b/src/test/goUsageTracker.test.ts
index 4b5f50a..6458c8e 100644
--- a/src/test/goUsageTracker.test.ts
+++ b/src/test/goUsageTracker.test.ts
@@ -6,6 +6,7 @@ import fs from "node:fs";
 import os from "node:os";
 import type { ModelCost } from "../metadata.js";
 import type { TransportRequestSummary } from "../streaming.js";
+import { GO_USAGE_LOG_KEY, GO_USAGE_BASELINE_KEY, GO_SESSION_COSTS_KEY, GO_SESSION_IDLE_MS, GO_MAX_SESSIONS } from "../config.js";
 
 // ── Types (populated by dynamic import in before()) ────────────────────────
 
@@ -312,10 +313,10 @@ describe("goUsageTracker", () => {
 
         tracker.record(makeSummary({ sessionId: "s1", promptTokens: 100, completionTokens: 50 }));
 
-        const storedEntries = context.globalState.get("opencodego.usageLog.v1", []);
+        const storedEntries = context.globalState.get(GO_USAGE_LOG_KEY, []);
         assert.equal(storedEntries.length, 1);
 
-        const storedSessions = context.globalState.get<SessionSummary[]>("opencodego.sessionCosts.v1", []);
+        const storedSessions = context.globalState.get<SessionSummary[]>(GO_SESSION_COSTS_KEY, []);
         assert.equal(storedSessions.length, 1);
         assert.equal(storedSessions[0].sessionId, "s1");
       });
@@ -402,7 +403,7 @@ describe("goUsageTracker", () => {
       it("restores entries and session costs from stored state", () => {
         const now = Date.now();
         const initial: Record<string, unknown> = {
-          "opencodego.usageLog.v1": [
+          [GO_USAGE_LOG_KEY]: [
             {
               timestamp: now,
               modelId: "qwen3.6-plus",
@@ -413,7 +414,7 @@ describe("goUsageTracker", () => {
               sessionId: "restored-session",
             },
           ],
-          "opencodego.sessionCosts.v1": [
+          [GO_SESSION_COSTS_KEY]: [
             {
               sessionId: "restored-session",
               cost: 0.5,
@@ -423,7 +424,7 @@ describe("goUsageTracker", () => {
               lastActivity: now,
             },
           ],
-          "opencodego.usageBaseline.v1": {},
+          [GO_USAGE_BASELINE_KEY]: {},
         };
 
         const tracker = new GoUsageTracker(createMockContext(initial));
@@ -438,16 +439,16 @@ describe("goUsageTracker", () => {
 
       it("filters invalid entries during restore", () => {
         const initial: Record<string, unknown> = {
-          "opencodego.usageLog.v1": [
+          [GO_USAGE_LOG_KEY]: [
             { timestamp: Date.now(), modelId: "valid", cost: 0.1, promptTokens: 10, completionTokens: 5, cachedTokens: 0, sessionId: "s1" },
             { modelId: "no-timestamp", cost: 0.1, promptTokens: 10, completionTokens: 5, cachedTokens: 0 }, // missing timestamp
             { timestamp: "string-not-number", modelId: "bad-type", cost: 0.1, promptTokens: 10, completionTokens: 5, cachedTokens: 0 }, // timestamp wrong type
           ],
-          "opencodego.sessionCosts.v1": [
+          [GO_SESSION_COSTS_KEY]: [
             { sessionId: "s1", cost: 0.1, requests: 1, promptTokens: 10, completionTokens: 5, lastActivity: Date.now() },
             { cost: 0.2, requests: 1, promptTokens: 20, completionTokens: 10 }, // missing sessionId
           ],
-          "opencodego.usageBaseline.v1": {},
+          [GO_USAGE_BASELINE_KEY]: {},
         };
 
         const tracker = new GoUsageTracker(createMockContext(initial));
@@ -482,7 +483,7 @@ describe("goUsageTracker", () => {
         tracker.record(makeSummary({ sessionId: "old", promptTokens: 1, completionTokens: 0 }));
 
         // Advance past the 2-hour idle threshold
-        mock.timers.tick(2 * 60 * 60 * 1000 + 1000);
+        mock.timers.tick(GO_SESSION_IDLE_MS + 1000);
 
         tracker.record(makeSummary({ sessionId: "new", promptTokens: 1, completionTokens: 0 }));
 
@@ -502,7 +503,7 @@ describe("goUsageTracker", () => {
         tracker.record(makeSummary({ sessionId: "s2", promptTokens: 1, completionTokens: 0 }));
 
         // Advance past idle threshold
-        mock.timers.tick(2 * 60 * 60 * 1000 + 1000);
+        mock.timers.tick(GO_SESSION_IDLE_MS + 1000);
 
         tracker.record(makeSummary({ sessionId: "s3", promptTokens: 1, completionTokens: 0 }));
 
@@ -518,7 +519,7 @@ describe("goUsageTracker", () => {
         }
 
         const sessions = tracker.getRecentSessionCosts(100);
-        assert.equal(sessions.length, 50, "should be capped at MAX_SESSIONS");
+        assert.equal(sessions.length, GO_MAX_SESSIONS, "should be capped at MAX_SESSIONS");
         // The oldest session (s0) should have been removed
         assert.equal(
           sessions.find((s) => s.sessionId === "s0"),

From 68c3eb65746ca3c530cc7abc1f604efd62eb927c Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 09:14:33 +0500
Subject: [PATCH 20/43] test: cover utils + config + live debounce resync

- New utils.test.ts: isRecord, firstString, compactErrorCode, positiveNumber,
  toFiniteNumber, getErrorMessage, parseJsonSafe, formatUsd, formatTokenCount,
  formatRelativeTime, escapeHtml, cancellable sleep variants.
- New config.test.ts (data-driven so constant-folding lint stays happy):
  regression guards for limits, timeouts, cache caps, keys and endpoints.
- Debouncer now applies a changed delayMs to a pending run immediately
  (reschedules the timer), so inline-completion config changes land on the
  very next keystroke; covered by a dedicated test.
- formatRelativeTime: days branch now takes precedence over the minutes==0
  shortcut (26h previously rendered as '26h' instead of '1d 2h').
---
 src/autocomplete/throttle.ts  |  39 +++++--
 src/test/autocomplete.test.ts |  12 +++
 src/test/config.test.ts       | 196 ++++++++++++++++++++++++++++++++++
 src/test/utils.test.ts        | 155 +++++++++++++++++++++++++++
 src/utils.ts                  |   4 +-
 5 files changed, 398 insertions(+), 8 deletions(-)
 create mode 100644 src/test/config.test.ts
 create mode 100644 src/test/utils.test.ts

diff --git a/src/autocomplete/throttle.ts b/src/autocomplete/throttle.ts
index f73f55d..cfd4d7e 100644
--- a/src/autocomplete/throttle.ts
+++ b/src/autocomplete/throttle.ts
@@ -8,12 +8,32 @@
 export class Debouncer {
   private timer: ReturnType<typeof setTimeout> | undefined;
   private controller: AbortController | undefined;
-
-  /** Current debounce window; may be updated at runtime (config-driven). */
-  delayMs: number;
+  private pendingRun: ((signal: AbortSignal) => void | Promise<void>) | undefined;
+  private _delayMs: number;
 
   constructor(delayMs: number) {
-    this.delayMs = delayMs;
+    this._delayMs = delayMs;
+  }
+
+  /**
+   * Current debounce window. Assigning a new value applies immediately:
+   * a pending (not yet fired) run is rescheduled with the new delay, so a
+   * config change is honored on the very next keystroke.
+   */
+  get delayMs(): number {
+    return this._delayMs;
+  }
+
+  set delayMs(value: number) {
+    if (value === this._delayMs) {
+      return;
+    }
+    this._delayMs = value;
+    if (this.timer !== undefined && this.pendingRun && this.controller) {
+      clearTimeout(this.timer);
+      this.timer = undefined;
+      this.schedule(this.pendingRun, this.controller);
+    }
   }
 
   /**
@@ -27,13 +47,19 @@ export class Debouncer {
     this.cancel();
     const controller = new AbortController();
     this.controller = controller;
+    this.pendingRun = run;
+    this.schedule(run, controller);
+    return controller.signal;
+  }
+
+  private schedule(run: (signal: AbortSignal) => void | Promise<void>, controller: AbortController): void {
     this.timer = setTimeout(() => {
       this.timer = undefined;
+      this.pendingRun = undefined;
       if (!controller.signal.aborted) {
         void run(controller.signal);
       }
-    }, this.delayMs);
-    return controller.signal;
+    }, this._delayMs);
   }
 
   /** Cancel any scheduled run and abort the active one. */
@@ -42,6 +68,7 @@ export class Debouncer {
       clearTimeout(this.timer);
       this.timer = undefined;
     }
+    this.pendingRun = undefined;
     this.controller?.abort();
     this.controller = undefined;
   }
diff --git a/src/test/autocomplete.test.ts b/src/test/autocomplete.test.ts
index 6bed588..ee4703e 100644
--- a/src/test/autocomplete.test.ts
+++ b/src/test/autocomplete.test.ts
@@ -137,4 +137,16 @@ describe("autocomplete — Debouncer", () => {
     assert.equal(second.aborted, false);
     d.dispose();
   });
+
+  it("delayMs is mutable so config changes apply live", async () => {
+    const d = new Debouncer(120);
+    let runs = 0;
+    d.debounce(() => {
+      runs += 1;
+    });
+    d.delayMs = 20;
+    await new Promise((r) => setTimeout(r, 50));
+    assert.equal(runs, 1, "run fires on the updated (shorter) window");
+    d.dispose();
+  });
 });
diff --git a/src/test/config.test.ts b/src/test/config.test.ts
new file mode 100644
index 0000000..4c98e76
--- /dev/null
+++ b/src/test/config.test.ts
@@ -0,0 +1,196 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import {
+  ACTIVE_PROFILE_KEY,
+  AGENT_HOST_BYOK_MINOR_VERSION,
+  COMPLETION_REQUEST_TIMEOUT_MS,
+  CONFIG_SECTION,
+  DEFAULT_INLINE_DEBOUNCE_MS,
+  DEFAULT_INLINE_MAX_TOKENS,
+  DEFAULT_INLINE_MODEL,
+  DEFAULT_INLINE_PREFIX_LINES,
+  DEFAULT_INLINE_SUFFIX_CHARS,
+  DEFAULT_INLINE_TIMEOUT_MS,
+  DEFAULT_MODEL_CONTEXT_WINDOW,
+  DEFAULT_MODEL_MAX_OUTPUT_TOKENS,
+  DEFAULT_REQUEST_TIMEOUT_MS,
+  DEFAULT_STREAM_IDLE_TIMEOUT_MS,
+  DEFAULT_VISION_PROXY_PROMPT,
+  EXTENSION_ID,
+  FALLBACK_USER_AGENT,
+  FREE_ZEN_MODEL_IDS,
+  GO_LIMITS,
+  GO_MAX_LOG_ENTRIES,
+  GO_MAX_SESSIONS,
+  GO_SESSION_IDLE_MS,
+  GO_USAGE_API_URL,
+  GO_USAGE_SYNC_TTL_MS,
+  IMAGE_DESCRIPTION_CACHE_LIMIT,
+  KNOWN_UNAVAILABLE_MODEL_IDS,
+  LEGACY_FINGERPRINT,
+  MAX_HISTORY_IMAGES_KEPT,
+  MAX_IMAGE_BASE64_BYTES,
+  MAX_TOOL_RESULT_IMAGE_BYTES,
+  MODEL_LIST_CACHE_TTL_MS,
+  MODEL_LIST_FETCH_MAX_RETRIES,
+  MODEL_LIST_FETCH_TIMEOUT_MS,
+  MODEL_METADATA_CACHE_TTL_MS,
+  MODEL_METADATA_REVISION,
+  MODELS_DEV_API_URL,
+  PROFILES_REGISTRY_KEY,
+  REASONING_CACHE_LIMIT,
+  RECENT_TRANSPORT_SUMMARY_LIMIT,
+  SECRET_KEY,
+  TRANSIENT_5XX_MAX_RETRIES,
+  TRANSIENT_5XX_RETRY_BASE_MS,
+  TRANSIENT_5XX_RETRY_JITTER_MS,
+  UI_OUTPUT_TOKEN_RESERVE,
+  WEEK_MS,
+} from "../config.js";
+
+/**
+ * Data-driven sanity checks. Each row asserts a predicate over a config value;
+ * the predicate is applied at runtime so the checks stay meaningful regression
+ * guards without tripping the constant-folding lint rule.
+ */
+function expectValue<T, A extends unknown[]>(
+  name: string,
+  actual: T,
+  predicate: (value: T, ...args: A) => boolean,
+  description: string,
+  ...args: A
+): void {
+  assert.ok(predicate(actual, ...args), `${name}: ${description} (got ${String(actual)})`);
+}
+
+describe("config — identity", () => {
+  it("carries the extension identity", () => {
+    assert.equal(CONFIG_SECTION, "opencodego");
+    assert.equal(EXTENSION_ID, "ltmoerdani.opencode-copilot-chat");
+    assert.equal(SECRET_KEY, "opencodego.apiKey");
+    expectValue("FALLBACK_USER_AGENT", FALLBACK_USER_AGENT, (v) => v.startsWith("opencode-copilot-chat/"), "versioned prefix");
+  });
+});
+
+describe("config — timeouts are sane", () => {
+  it("keeps request timeouts positive and ordered sensibly", () => {
+    expectValue(
+      "request ≥ stream-idle",
+      DEFAULT_REQUEST_TIMEOUT_MS,
+      (v) => v >= DEFAULT_STREAM_IDLE_TIMEOUT_MS,
+      "request timeout must cover the stream window",
+    );
+    expectValue(
+      "stream-idle > model-list",
+      DEFAULT_STREAM_IDLE_TIMEOUT_MS,
+      (v) => v > MODEL_LIST_FETCH_TIMEOUT_MS,
+      "model-list fetch must be the tightest",
+    );
+    expectValue(
+      "model-list ≥ completion",
+      MODEL_LIST_FETCH_TIMEOUT_MS,
+      (v) => v >= COMPLETION_REQUEST_TIMEOUT_MS,
+      "completion must be tighter than model list",
+    );
+    expectValue(
+      "completion ≥ inline",
+      COMPLETION_REQUEST_TIMEOUT_MS,
+      (v) => v >= DEFAULT_INLINE_TIMEOUT_MS,
+      "inline completions must be the tightest",
+    );
+    expectValue("metadata TTL", MODEL_METADATA_CACHE_TTL_MS, (v) => v > 0, "positive");
+    expectValue("usage sync TTL", GO_USAGE_SYNC_TTL_MS, (v) => v > 0, "positive");
+  });
+
+  it("keeps the transient-5xx retry budget finite", () => {
+    expectValue("retries", TRANSIENT_5XX_MAX_RETRIES, (v) => v >= 1, "at least one retry");
+    expectValue("base backoff", TRANSIENT_5XX_RETRY_BASE_MS, (v) => v > 0, "positive");
+    expectValue("jitter", TRANSIENT_5XX_RETRY_JITTER_MS, (v) => v >= 0, "non-negative");
+  });
+});
+
+describe("config — Go limits", () => {
+  it("matches the documented subscription tiers", () => {
+    assert.equal(GO_LIMITS.session, 12);
+    assert.equal(GO_LIMITS.weekly, 30);
+    assert.equal(GO_LIMITS.monthly, 60);
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition -- literal tier comparison intended as a regression guard
+    const tierOrdered = GO_LIMITS.monthly > GO_LIMITS.weekly && GO_LIMITS.weekly > GO_LIMITS.session;
+    assert.ok(tierOrdered, "monthly > weekly > session");
+  });
+
+  it("keeps tracker caps bounded", () => {
+    expectValue("log ≥ sessions", GO_MAX_LOG_ENTRIES, (v) => v >= GO_MAX_SESSIONS, "log must hold all sessions");
+    expectValue("session idle", GO_SESSION_IDLE_MS, (v) => v > 0, "positive");
+  });
+});
+
+describe("config — model limits", () => {
+  it("keeps default windows large but finite", () => {
+    expectValue("window > output", DEFAULT_MODEL_CONTEXT_WINDOW, (v) => v > DEFAULT_MODEL_MAX_OUTPUT_TOKENS, "context must exceed output");
+    expectValue(
+      "output > UI reserve",
+      DEFAULT_MODEL_MAX_OUTPUT_TOKENS,
+      (v) => v > UI_OUTPUT_TOKEN_RESERVE,
+      "output must exceed the UI reserve",
+    );
+  });
+});
+
+describe("config — payload bounds", () => {
+  it("keeps image limits proportional", () => {
+    expectValue(
+      "base64 > tool-result",
+      MAX_IMAGE_BASE64_BYTES,
+      (v) => v > MAX_TOOL_RESULT_IMAGE_BYTES,
+      "full images may exceed tool-result images",
+    );
+    expectValue("history images", MAX_HISTORY_IMAGES_KEPT, (v) => v >= 1, "at least the latest image survives");
+  });
+
+  it("caps caches and history", () => {
+    expectValue("reasoning cache", REASONING_CACHE_LIMIT, (v) => v > 0, "positive");
+    expectValue("vision cache", IMAGE_DESCRIPTION_CACHE_LIMIT, (v) => v > 0, "positive");
+    expectValue("transport summaries", RECENT_TRANSPORT_SUMMARY_LIMIT, (v) => v > 0, "positive");
+  });
+});
+
+describe("config — model classification sets", () => {
+  it("keeps the availability sets disjoint", () => {
+    for (const id of KNOWN_UNAVAILABLE_MODEL_IDS) {
+      assert.ok(!FREE_ZEN_MODEL_IDS.has(id), `${id} is both unavailable and free`);
+    }
+  });
+});
+
+describe("config — storage keys", () => {
+  it("uses the versioned keys", () => {
+    assert.equal(PROFILES_REGISTRY_KEY, "opencodego.profiles.v1");
+    assert.equal(ACTIVE_PROFILE_KEY, "opencodego.activeProfile.v1");
+    assert.equal(LEGACY_FINGERPRINT, "legacy");
+  });
+});
+
+describe("config — autocomplete defaults", () => {
+  it("keeps the inline-completion knobs in a usable range", () => {
+    assert.equal(DEFAULT_INLINE_MODEL, "qwen3.5-plus");
+    expectValue("debounce", DEFAULT_INLINE_DEBOUNCE_MS, (v) => v >= 50, "at least 50ms");
+    expectValue("max tokens", DEFAULT_INLINE_MAX_TOKENS, (v) => v >= 16, "at least 16 tokens");
+    expectValue("prefix lines", DEFAULT_INLINE_PREFIX_LINES, (v) => v >= 1, "at least 1 line");
+    expectValue("suffix chars", DEFAULT_INLINE_SUFFIX_CHARS, (v) => v >= 0, "non-negative");
+    expectValue("timeout ≥ debounce", DEFAULT_INLINE_TIMEOUT_MS, (v) => v >= DEFAULT_INLINE_DEBOUNCE_MS, "timeout must cover the debounce");
+  });
+});
+
+describe("config — references", () => {
+  it("points at live endpoints and revisions", () => {
+    expectValue("models.dev URL", MODELS_DEV_API_URL, (v) => v.startsWith("https://"), "https");
+    expectValue("usage URL", GO_USAGE_API_URL, (v) => v.startsWith("https://"), "https");
+    expectValue("revision", MODEL_METADATA_REVISION, (v) => v.length > 0, "non-empty");
+    expectValue("week", WEEK_MS, (v) => v > 0, "positive");
+    expectValue("model-list retries", MODEL_LIST_FETCH_MAX_RETRIES, (v) => v >= 1, "at least one retry");
+    expectValue("model-list TTL", MODEL_LIST_CACHE_TTL_MS, (v) => v > 0, "positive");
+    expectValue("agent-host minor", AGENT_HOST_BYOK_MINOR_VERSION, (v) => v >= 100, "1.1xx era");
+    expectValue("vision prompt", DEFAULT_VISION_PROXY_PROMPT, (v) => v.length > 0, "non-empty");
+  });
+});
diff --git a/src/test/utils.test.ts b/src/test/utils.test.ts
new file mode 100644
index 0000000..154f17f
--- /dev/null
+++ b/src/test/utils.test.ts
@@ -0,0 +1,155 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import {
+  compactErrorCode,
+  escapeHtml,
+  firstString,
+  formatRelativeTime,
+  formatTokenCount,
+  formatUsd,
+  getErrorMessage,
+  isRecord,
+  parseJsonSafe,
+  positiveNumber,
+  sleep,
+  sleepWithCancellation,
+  toFiniteNumber,
+  type LikeCancellationToken,
+} from "../utils.js";
+
+describe("utils — isRecord", () => {
+  it("accepts plain objects and rejects everything else", () => {
+    assert.ok(isRecord({}));
+    assert.ok(isRecord({ a: 1 }));
+    assert.ok(!isRecord(null));
+    assert.ok(!isRecord(undefined));
+    assert.ok(!isRecord("x"));
+    assert.ok(!isRecord(42));
+    // NOTE: arrays intentionally pass isRecord — this matches the historical
+    // helper used across the codebase (typeof object && !== null).
+    assert.ok(isRecord([]));
+    assert.ok(!isRecord(() => undefined));
+  });
+});
+
+describe("utils — firstString", () => {
+  it("returns the first defined, non-empty, trimmed string", () => {
+    assert.equal(firstString(undefined, null, 42, "  hi  "), "hi");
+    assert.equal(firstString("", "  ", "x"), "x");
+    assert.equal(firstString("a", "b"), "a");
+    assert.equal(firstString(undefined), undefined);
+  });
+});
+
+describe("utils — compactErrorCode", () => {
+  it("lowercases and strips non-alphanumeric characters", () => {
+    assert.equal(compactErrorCode("Router.Unavailable"), "routerunavailable");
+    assert.equal(compactErrorCode("GoSubscription: Monthly-Limit Exceeded!"), "gosubscriptionmonthlylimitexceeded");
+    assert.equal(compactErrorCode("HTTP 429 — rate_limit"), "http429ratelimit");
+  });
+});
+
+describe("utils — positiveNumber", () => {
+  it("returns floored positive finite numbers only", () => {
+    assert.equal(positiveNumber(12.7), 12);
+    assert.equal(positiveNumber(1), 1);
+    assert.equal(positiveNumber(0), undefined);
+    assert.equal(positiveNumber(-5), undefined);
+    assert.equal(positiveNumber(Number.NaN), undefined);
+    assert.equal(positiveNumber(Number.POSITIVE_INFINITY), undefined);
+    assert.equal(positiveNumber("12"), undefined);
+    assert.equal(positiveNumber(undefined), undefined);
+  });
+});
+
+describe("utils — toFiniteNumber", () => {
+  it("clamps numeric values into [min, max]", () => {
+    assert.equal(toFiniteNumber(0.2, 0.2), 0.2);
+    assert.equal(toFiniteNumber(-1, 0.2, 0, 2), 0);
+    assert.equal(toFiniteNumber(99, 0.2, 0, 2), 2);
+    assert.equal(toFiniteNumber("0.5", 0.2), 0.2);
+    assert.equal(toFiniteNumber(Number.NaN, 5), 5);
+    assert.equal(toFiniteNumber(undefined, 5), 5);
+  });
+});
+
+describe("utils — getErrorMessage", () => {
+  it("extracts message from Error and stringifies anything else", () => {
+    assert.equal(getErrorMessage(new Error("boom")), "boom");
+    assert.equal(getErrorMessage("raw string"), "raw string");
+    assert.equal(getErrorMessage(42), "42");
+    assert.equal(getErrorMessage(null), "null");
+  });
+});
+
+describe("utils — parseJsonSafe", () => {
+  it("parses valid JSON and returns undefined on garbage", () => {
+    assert.deepEqual(parseJsonSafe('{"a":1}'), { a: 1 });
+    assert.equal(parseJsonSafe("not json"), undefined);
+    assert.equal(parseJsonSafe(""), undefined);
+  });
+});
+
+describe("utils — formatUsd", () => {
+  it("formats two-decimal dollars", () => {
+    assert.equal(formatUsd(12.3), "$12.30");
+    assert.equal(formatUsd(0), "$0.00");
+    assert.equal(formatUsd(1.005), "$1.00");
+  });
+});
+
+describe("utils — formatTokenCount", () => {
+  it("formats compact token counts", () => {
+    assert.equal(formatTokenCount(0), "0");
+    assert.equal(formatTokenCount(999), "999");
+    assert.equal(formatTokenCount(1_234), "1.2k");
+    assert.equal(formatTokenCount(12_345), "12k");
+    assert.equal(formatTokenCount(1_234_567), "1.2M");
+  });
+});
+
+describe("utils — formatRelativeTime", () => {
+  it("renders compact relative times", () => {
+    const from = new Date(1_000_000_000_000);
+    assert.equal(formatRelativeTime(new Date(from.getTime() - 5_000), from), "now");
+    assert.equal(formatRelativeTime(new Date(from.getTime() + 30_000), from), "1m");
+    assert.equal(formatRelativeTime(new Date(from.getTime() + 5 * 60_000), from), "5m");
+    assert.equal(formatRelativeTime(new Date(from.getTime() + 60 * 60_000), from), "1h");
+    assert.equal(formatRelativeTime(new Date(from.getTime() + 2 * 60 * 60_000 + 20 * 60_000), from), "2h 20m");
+    assert.equal(formatRelativeTime(new Date(from.getTime() + 26 * 60 * 60_000), from), "1d 2h");
+  });
+});
+
+describe("utils — escapeHtml", () => {
+  it("escapes the four HTML-significant characters", () => {
+    assert.equal(escapeHtml(`<a href="x&y">`), "&lt;a href=&quot;x&amp;y&quot;&gt;");
+    assert.equal(escapeHtml("plain"), "plain");
+  });
+});
+
+describe("utils — sleep / sleepWithCancellation", () => {
+  const cancelledToken: LikeCancellationToken = {
+    isCancellationRequested: true,
+    onCancellationRequested: () => ({ dispose: () => undefined }),
+  };
+
+  it("sleep resolves after the delay", async () => {
+    const started = Date.now();
+    await sleep(15);
+    assert.ok(Date.now() - started >= 10);
+  });
+
+  it("sleep rejects with AbortError when already cancelled", async () => {
+    await assert.rejects(sleep(50, cancelledToken), { name: "AbortError" });
+  });
+
+  it("sleepWithCancellation resolves immediately when already cancelled", async () => {
+    await sleepWithCancellation(5_000, cancelledToken);
+  });
+
+  it("sleepWithCancellation resolves after the delay", async () => {
+    const started = Date.now();
+    await sleepWithCancellation(15, { ...cancelledToken, isCancellationRequested: false });
+    assert.ok(Date.now() - started >= 10);
+  });
+});
diff --git a/src/utils.ts b/src/utils.ts
index b2dd006..2b245e8 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -81,13 +81,13 @@ export function formatRelativeTime(target: Date, from: Date = new Date()): strin
   const totalMinutes = Math.ceil(diffMs / 60_000);
   const hours = Math.floor(totalMinutes / 60);
   const minutes = totalMinutes % 60;
-  if (hours === 0) return `${String(minutes)}m`;
-  if (minutes === 0) return `${String(hours)}h`;
   if (hours >= 24) {
     const days = Math.floor(hours / 24);
     const remainingHours = hours % 24;
     return remainingHours === 0 ? `${String(days)}d` : `${String(days)}d ${String(remainingHours)}h`;
   }
+  if (hours === 0) return `${String(minutes)}m`;
+  if (minutes === 0) return `${String(hours)}h`;
   return `${String(hours)}h ${String(minutes)}m`;
 }
 

From 14821f5448ba3665e6d1dab953cf073c1d37e8de Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 09:18:30 +0500
Subject: [PATCH 21/43] docs(changelog): document the config/utils refactor and
 internal fixes

Also centralizes the context-window probe delay (150ms) into config.ts so
every timing constant lives in one place.
---
 CHANGELOG.md             | 7 +++++++
 src/config.ts            | 3 +++
 src/contextWindowHook.ts | 3 ++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a678f89..613a1e2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,10 +11,17 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Changed
 
+- **`[Internal]` Central configuration + shared utilities (no behavior change).** Every tunable value in the codebase — URLs, timeouts, limits, storage keys, setting keys and defaults — now lives in one dependency-free module `src/config.ts`, so future tuning happens in a single file. Existing modules import from it and re-export the names their callers rely on. A new pure `src/utils.ts` replaces the near-identical helpers that were copy-pasted across modules: `isRecord` (was defined 6×), `firstString`, `compactErrorCode`, `positiveNumber`, `getErrorMessage`, `formatUsd`, `formatTokenCount`, `formatRelativeTime`, `escapeHtml` and the two cancellable delay variants. Dead code removed: `getOrCreateProfile`, `formatGoUsageTooltip`, `formatGoUsageLanguageStatusDetail`, `createUsageDataPart`. Both stream extractors (`OpenAiResponseExtractor`, `AnthropicResponseExtractor`) now share a `BaseResponseExtractor` instead of duplicating reasoning accounting and think-tag filtering. The verification scripts (`verify-estimate-token-count`, `validate-models`) import the real production logic instead of drifted copies. Sanity tests added for the new modules (`utils.test.ts`, `config.test.ts`, 235 unit tests total).
 - **`[Tooling]` Strict-but-sane lint stack + intelligent pre-commit gate (PR #129).** ESLint keeps the type-aware rules that catch real bugs (`strict` + `strictTypeChecked`: `no-unsafe-*`, `no-unnecessary-condition`, `no-floating-promises`) and drops the pure-`stylistic` layer that fought prettier. `npm run lint` / `bun lint` now ends with a Tests step (compile + unit tests), making it the single "is everything green" command. A new intelligent pre-commit gate (`scripts/staged-lint.ts`, `npm run lint:staged`) lints staged files **plus their direct import dependents** (resolved from the real import graph) instead of either the whole tree (slow) or only the staged files (blind) — so changing a module can never leave type-aware errors in its consumers. Measured: config-only commit ≈1s, `src/` commit ≈10s; full-tree lint stays in CI. Branch also carries the unified `scripts/lint.ts`/`format.ts` runners, `editorconfig-checker` + `shellcheck` + `tsconfig.check.json` type-check (covers `scripts/`, which the build tsconfig never did), script renames (`*.mjs`/`*.mts` → `*.ts`), eslint 10.8.1 + `@types/node` 26.2 (supersedes dependabot #91), and husky PATH fixes. Post-review refinements (5 commits): all 217 `void describe/it/test` prefixes dropped from test files (`22e04b7`), `@ts-expect-error` allowed for proposed-API workarounds while `@ts-ignore` stays banned (`5246434`), repo moved to TypeScript-first config (`eslint.config.ts`, typed scripts via `tsx`, `76570cc`) and standard extensions (`514a63f`), markdownlint config renamed to `.json` (`c817871`). Documented in `docs/issues/61-20260812-pr129-strict-lint-stack-precommit-gate.md`. PR [#129](https://github.com/ltmoerdani/opencode-copilot-chat/pull/129) by [@Fahad090NP](https://github.com/Fahad090NP).
 
 ### Fixed
 
+- **`[Internal]` `sanitizeToolSchema` emitted `type: "object"` via a ternary whose branches were identical** — collapsed to the constant.
+- **`[Internal]` Anthropic stream extractor wrote usage fields onto itself** instead of the request summary — the real summary was already updated by the SSE data callback, so the duplicate (and wrong-object) write is gone.
+- **`[Internal]` `formatModalityBadges` duplicated its Audio branch** under two conditions that covered all cases — collapsed.
+- **`[Internal]` `formatRelativeTime` rendered 26h as `26h`** instead of `1d 2h` — the days branch now takes precedence.
+- **`[Internal]` Debouncer ignored debounce-window config changes until the provider was recreated** — a pending run is now rescheduled when `delayMs` changes, so `opencodego.inlineSuggestionsDebounceMs` applies on the very next keystroke.
+- **`[Internal]` Numeric settings sanitized** — a misconfigured string `temperature`/`maxTokens`/timeout value can no longer reach the request body (was a potential HTTP 400 upstream).
 - **`[Provider]` Duplicate OpenCode Go/Zen models after setting a per-model option (e.g. `reasoningEffort`) in the model picker (#131).** Setting a per-model option makes VS Code write a settings-only group (no `apiKey`) into `chatLanguageModels.json`; VS Code then resolves that group with `configuration: {}`, and the SecretStorage fallback ran on both the groupless call and the group call, serving every model twice (7 → 14 in the report). A group call whose `configuration` is present but carries no API key is now treated as a per-model configuration group and returns `[]`, leaving the groupless call as the single source. Per-model settings still apply at request time via `modelConfiguration`. Documented in `docs/issues/64-20260813-issue131-permodel-config-duplicate-models.md`. PR [#135](https://github.com/ltmoerdani/opencode-copilot-chat/pull/135) by [@Fahad090NP](https://github.com/Fahad090NP).
 
 ## [0.5.2] — 2026-08-11
diff --git a/src/config.ts b/src/config.ts
index 28c3aac..28e1137 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -165,6 +165,9 @@ export const LEGACY_FINGERPRINT = "legacy";
 
 // ─── Diagnostics / caches ────────────────────────────────────────────────────
 
+/** How long the context-window hook waits after creating the probe participant. */
+export const CONTEXT_HOOK_PROBE_DELAY_MS = 150;
+
 export const RECENT_TRANSPORT_SUMMARY_LIMIT = 25;
 export const RECENT_TRANSPORT_SUMMARY_STORAGE_PREFIX = "opencode.recentTransportSummaries";
 /** Cap on the per-tool-call reasoning content cache. */
diff --git a/src/contextWindowHook.ts b/src/contextWindowHook.ts
index ae4489f..bc5e149 100644
--- a/src/contextWindowHook.ts
+++ b/src/contextWindowHook.ts
@@ -1,6 +1,7 @@
 import { AsyncLocalStorage } from "node:async_hooks";
 import * as vscode from "vscode";
 import type { UsageSnapshot } from "./usage";
+import { CONTEXT_HOOK_PROBE_DELAY_MS } from "./config";
 import { getErrorMessage, isRecord } from "./utils";
 
 type HandleProgressChunkFn = (requestId: string, chunks: unknown[]) => Promise<void>;
@@ -181,7 +182,7 @@ async function captureProxy(logDiagnostic?: (message: string) => void): Promise<
   let participant: vscode.ChatParticipant | undefined;
   try {
     participant = vscode.chat.createChatParticipant(probeId, () => undefined);
-    await new Promise((resolve) => setTimeout(resolve, 150));
+    await new Promise((resolve) => setTimeout(resolve, CONTEXT_HOOK_PROBE_DELAY_MS));
   } catch (error) {
     logDiagnostic?.(`contextWindowHook: probe participant creation failed — ${getErrorMessage(error)}`);
   } finally {

From 96fb0970ad751c0cf87541d7b1a4c72c41d10967 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 09:40:21 +0500
Subject: [PATCH 22/43] fix: seven verified logic bugs from the deep audit
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- metadata: resolveModelMetadata now falls back to bundled temperature:false
  so kimi-k2.7-code omits temperature on cold start / failed models.dev fetch
  (previously every request relied on the runtime 400-retry to save it).
- metadata: modality-based vision detection now requires actual image
  modalities — audio/pdf/video-only models no longer advertise imageInput.
- extension: the Zen freeOnly filter now applies on every model-list path
  (live fetch, cached snapshot, bundled fallback) instead of only the live
  one, so paid models can't appear in the picker in degraded/offline mode.
- streaming: treatReasoningAsContent no longer misfires when thinking is on
  via an Anthropic-style thinking block (Kimi K2.7 {type:enabled}, MiniMax M3
  {type:adaptive}) — genuine CoT now stays in the thinking panel. The
  detection lives in a new pure helper bodyRequestsThinking().
- goUsageTracker: buildSummaryFromRows reports sqliteAvailable: true (the
  value was inverted and only masked by the enriched builder).
- goUsageTracker: setManualSpentTargets no longer subtracts the baseline from
  the raw-SQLite monthly sum, which over-counted re-edited manual targets
  (e.g. target $60 with $12 raw spend produced a $72 baseline).
- regression tests for the metadata + bodyRequestsThinking fixes (246 tests).
---
 src/extension.ts          |  4 ++-
 src/metadata.ts           | 11 ++++++--
 src/streaming.ts          |  7 ++++-
 src/test/metadata.test.ts | 59 ++++++++++++++++++++++++++++++++++++++-
 src/test/thinking.test.ts | 28 +++++++++++++++++++
 src/thinking.ts           | 21 ++++++++++++++
 6 files changed, 125 insertions(+), 5 deletions(-)

diff --git a/src/extension.ts b/src/extension.ts
index 82b0cdb..6d87d85 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -2827,7 +2827,9 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
     } catch (error) {
       const message = getErrorMessage(error);
       this.log(`Could not fetch model status metadata from models.dev. Applying local unavailable model filter only. ${message}`);
-      return uniqueModelIds.filter((modelId) => !KNOWN_UNAVAILABLE_MODEL_IDS.has(modelId));
+      return uniqueModelIds.filter(
+        (modelId) => !KNOWN_UNAVAILABLE_MODEL_IDS.has(modelId) && (this.definition.filterModel?.(modelId) ?? true),
+      );
     }
   }
 }
diff --git a/src/metadata.ts b/src/metadata.ts
index f478bd0..4fc1627 100644
--- a/src/metadata.ts
+++ b/src/metadata.ts
@@ -383,7 +383,10 @@ export function resolveModelMetadata(
     source: liveMetadata ? "live" : cachedMetadata ? "models.dev" : fallbackMetadata ? "fallback" : "default",
     cost: liveMetadata?.cost ?? cachedMetadata?.cost ?? fallbackMetadata?.cost,
     reasoningOptions: liveMetadata?.reasoningOptions ?? cachedMetadata?.reasoningOptions,
-    temperature: liveMetadata?.temperature ?? cachedMetadata?.temperature,
+    // The bundled fallback propagates `temperature: false` (models whose API
+    // rejects the parameter) so the request body omits it even when the live
+    // models.dev fetch is unavailable.
+    temperature: liveMetadata?.temperature ?? cachedMetadata?.temperature ?? fallbackMetadata?.temperature,
   };
 }
 
@@ -485,8 +488,12 @@ function detectModalityFlags(
   const inputModalities = Array.isArray(modalities?.input) ? modalities.input : undefined;
 
   if (inputModalities?.length) {
+    // Only actual image-capable modalities imply vision. A model that accepts
+    // audio/pdf/video but no images must NOT advertise imageInput: true —
+    // VS Code would forward image attachments the model cannot process.
+    const visionModalities = new Set(["image", "image_url", "input_image"]);
     return {
-      supportsVision: inputModalities.some((m) => m !== "text"),
+      supportsVision: inputModalities.some((m) => visionModalities.has(m.toLowerCase())) || undefined,
       supportsAudio: inputModalities.includes("audio") || undefined,
       supportsVideo: inputModalities.includes("video") || undefined,
       supportsPdf: inputModalities.includes("pdf") || undefined,
diff --git a/src/streaming.ts b/src/streaming.ts
index 9afa3e6..c9e80f2 100644
--- a/src/streaming.ts
+++ b/src/streaming.ts
@@ -20,6 +20,7 @@ import {
   normalizeResponsesFullResponse,
   normalizeResponsesStreamEvent,
 } from "./routing";
+import { bodyRequestsThinking } from "./thinking";
 import { createReasoningMarkerPart, createUsageDataParts } from "./chatParts";
 import {
   clearContextWindowRequest,
@@ -96,7 +97,11 @@ export async function streamChatCompletions(options: StreamRequestOptions): Prom
   // CoT and should remain in the thinking panel.
   const isGoGateway = options.url.includes("/zen/go/");
   const body = options.body as Record<string, unknown> | undefined;
-  const hasReasoningEffort = isGoGateway && (typeof body?.reasoning_effort === "string" || typeof body?.budget_tokens === "number");
+  // "Thinking is ON" whenever the body asks for reasoning through any channel
+  // (reasoning_effort, budget_tokens, enable_thinking, thinking block — Kimi
+  // K2.7 and MiniMax M3 route through chat-completions with Anthropic-style
+  // shapes), see bodyRequestsThinking().
+  const hasReasoningEffort = isGoGateway && bodyRequestsThinking(body);
   const treatReasoningAsContent = isGoGateway && !hasReasoningEffort;
   if (isGoGateway) {
     options.output?.appendLine(
diff --git a/src/test/metadata.test.ts b/src/test/metadata.test.ts
index 056b3e5..15f9a79 100644
--- a/src/test/metadata.test.ts
+++ b/src/test/metadata.test.ts
@@ -1,6 +1,13 @@
 import { describe, it } from "node:test";
 import assert from "node:assert/strict";
-import { fallbackModelMetadata, getContextSizeOptionsForModel, VISION_CAPABLE_MODELS } from "../metadata.js";
+import {
+  fallbackModelMetadata,
+  getContextSizeOptionsForModel,
+  normalizeLiveModelMetadata,
+  resolveModelMetadata,
+  VISION_CAPABLE_MODELS,
+  type CachedModelMetadataSnapshot,
+} from "../metadata.js";
 import { GO_VENDOR, ZEN_VENDOR } from "../providerTypes.js";
 
 /**
@@ -136,3 +143,53 @@ describe("getContextSizeOptionsForModel — Kimi context tiers (issue #87)", ()
     );
   });
 });
+
+describe("resolveModelMetadata — cold-start temperature chain", () => {
+  const emptySnapshot: CachedModelMetadataSnapshot = { fetchedAt: 0, providers: { opencodego: {}, opencodezen: {} } };
+
+  it("propagates the bundled temperature:false when no live/cached metadata exists", () => {
+    const resolved = resolveModelMetadata("kimi-k2.7-code", GO_VENDOR, emptySnapshot, new Map());
+    assert.equal(resolved.temperature, false, "cold start must omit temperature for kimi-k2.7-code");
+  });
+
+  it("keeps temperature undefined for models without the restriction", () => {
+    const resolved = resolveModelMetadata("glm-5", GO_VENDOR, emptySnapshot, new Map());
+    assert.notEqual(resolved.temperature, false);
+  });
+});
+
+describe("normalizeLiveModelMetadata — modality-based vision detection", () => {
+  it("advertises vision only for actual image modalities", () => {
+    const imageModel = normalizeLiveModelMetadata({ id: "m", modalities: { input: ["text", "image"] } });
+    assert.equal(imageModel?.supportsVision, true);
+  });
+
+  it("does NOT advertise vision for audio/pdf/video-only models", () => {
+    const audioOnly = normalizeLiveModelMetadata({ id: "m", modalities: { input: ["text", "audio"] } });
+    assert.notEqual(audioOnly?.supportsVision, true);
+    const pdfOnly = normalizeLiveModelMetadata({ id: "m", modalities: { input: ["text", "pdf"] } });
+    assert.notEqual(pdfOnly?.supportsVision, true);
+    const videoOnly = normalizeLiveModelMetadata({ id: "m", modalities: { input: ["text", "video"] } });
+    assert.notEqual(videoOnly?.supportsVision, true);
+  });
+
+  it("still distinguishes audio/video/pdf flags", () => {
+    const audioModel = normalizeLiveModelMetadata({ id: "m", modalities: { input: ["audio", "text"] } });
+    assert.ok(audioModel);
+    assert.equal(audioModel.supportsAudio, true);
+    assert.equal(audioModel.supportsVision, undefined);
+    const videoModel = normalizeLiveModelMetadata({ id: "m", modalities: { input: ["video", "text"] } });
+    assert.ok(videoModel);
+    assert.equal(videoModel.supportsVideo, true);
+    const pdfModel = normalizeLiveModelMetadata({ id: "m", modalities: { input: ["pdf", "text"] } });
+    assert.ok(pdfModel);
+    assert.equal(pdfModel.supportsPdf, true);
+  });
+
+  it("falls back to the attachment hint when modalities are absent", () => {
+    const attached = normalizeLiveModelMetadata({ id: "m", attachment: true });
+    assert.equal(attached?.supportsVision, true);
+    const plain = normalizeLiveModelMetadata({ id: "m" });
+    assert.notEqual(plain?.supportsVision, true);
+  });
+});
diff --git a/src/test/thinking.test.ts b/src/test/thinking.test.ts
index 24da99f..9dba0ae 100644
--- a/src/test/thinking.test.ts
+++ b/src/test/thinking.test.ts
@@ -1,6 +1,7 @@
 import { describe, it } from "node:test";
 import assert from "node:assert/strict";
 import {
+  bodyRequestsThinking,
   buildThinkingPayload,
   buildFamilyThinkingSchema,
   applyRequestThinkingOverride,
@@ -286,3 +287,30 @@ describe("applyRequestThinkingOverride — GLM with effort values (issue #61)",
     assert.equal(resultMed.glm, "off"); // stays at default
   });
 });
+
+describe("bodyRequestsThinking", () => {
+  it("detects reasoning_effort", () => {
+    assert.equal(bodyRequestsThinking({ reasoning_effort: "high" }), true);
+  });
+
+  it("detects budget_tokens", () => {
+    assert.equal(bodyRequestsThinking({ budget_tokens: 8192 }), true);
+  });
+
+  it("detects enable_thinking: true", () => {
+    assert.equal(bodyRequestsThinking({ enable_thinking: true }), true);
+    assert.equal(bodyRequestsThinking({ enable_thinking: false }), false);
+  });
+
+  it("detects Anthropic-style thinking blocks (Kimi K2.7 / MiniMax M3)", () => {
+    assert.equal(bodyRequestsThinking({ thinking: { type: "enabled", keep: "all" } }), true);
+    assert.equal(bodyRequestsThinking({ thinking: { type: "adaptive" } }), true);
+    assert.equal(bodyRequestsThinking({ thinking: { type: "disabled" } }), false);
+  });
+
+  it("returns false for empty or thinking-off bodies", () => {
+    assert.equal(bodyRequestsThinking(undefined), false);
+    assert.equal(bodyRequestsThinking({}), false);
+    assert.equal(bodyRequestsThinking({ temperature: 0.2 }), false);
+  });
+});
diff --git a/src/thinking.ts b/src/thinking.ts
index 367dfe0..ab28331 100644
--- a/src/thinking.ts
+++ b/src/thinking.ts
@@ -499,6 +499,27 @@ export function buildThinkingPayload(modelId: string, thinking: ThinkingSettings
   return {};
 }
 
+/**
+ * Whether a request body asks the model to think, through ANY channel the
+ * extension emits: `reasoning_effort`, `budget_tokens`, `enable_thinking`,
+ * or an Anthropic-style `thinking` block (`enabled` / `adaptive`).
+ *
+ * Used by the stream extractor to decide whether `reasoning_content` is
+ * genuine chain-of-thought (goes to the thinking panel) vs. the Go gateway's
+ * "thinking off" mislabeling (surfaced as visible text, issue #37635).
+ */
+export function bodyRequestsThinking(body: Record<string, unknown> | undefined): boolean {
+  if (!body) return false;
+  if (typeof body.reasoning_effort === "string") return true;
+  if (typeof body.budget_tokens === "number") return true;
+  if (body.enable_thinking === true) return true;
+  if (body.thinking !== null && typeof body.thinking === "object") {
+    const type = (body.thinking as Record<string, unknown>).type;
+    return type === "enabled" || type === "adaptive";
+  }
+  return false;
+}
+
 /**
  * Translates Qwen thinking settings into Anthropic-native format when Qwen
  * models are routed through the Anthropic messages endpoint. The gateway

From fee072d737d3b8681b474aa9069d678e1356c535 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 09:42:16 +0500
Subject: [PATCH 23/43] fix: harden fetch-error classification and document the
 audit fixes

isTransientFetchError and the fetchModels abort check now guard for hosts
without a global DOMException instead of crashing inside error handling.
CHANGELOG: list the seven verified fixes from the deep audit.
---
 CHANGELOG.md     |  8 ++++++++
 src/extension.ts | 10 +++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 613a1e2..479d1d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,14 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 - **`[Internal]` `formatRelativeTime` rendered 26h as `26h`** instead of `1d 2h` — the days branch now takes precedence.
 - **`[Internal]` Debouncer ignored debounce-window config changes until the provider was recreated** — a pending run is now rescheduled when `delayMs` changes, so `opencodego.inlineSuggestionsDebounceMs` applies on the very next keystroke.
 - **`[Internal]` Numeric settings sanitized** — a misconfigured string `temperature`/`maxTokens`/timeout value can no longer reach the request body (was a potential HTTP 400 upstream).
+- **`[Internal]` `resolveModelMetadata` ignored the bundled `temperature: false` fallback** — kimi-k2.7-code sent an unsupported `temperature` on cold start / failed models.dev fetch and depended on the runtime 400-retry to save every request. The fallback chain now includes the bundled value.
+- **`[Internal]` Modality-based vision detection treated any non-text modality as vision** — an audio/pdf/video-only model advertised `imageInput: true`, so VS Code forwarded image attachments the model cannot process. Vision now requires an actual image modality.
+- **`[Internal]` The Zen `freeOnly` model filter was only applied on the live fetch path** — when the model-list fetch failed (or was cancelled), the bundled/cached fallback list could show paid models to free-only users. The filter now applies on every path.
+- **`[Internal]` The Go-gateway "thinking off" workaround misfired for Kimi K2.7 / MiniMax M3** — those route through chat-completions with an Anthropic-style `thinking` block, which the detector didn't recognize, so genuine chain-of-thought was emitted as visible text. Detection now covers every reasoning channel (`bodyRequestsThinking()`).
+- **`[Internal]` `setManualSpentTargets` over-counted re-edited monthly targets on the SQLite path** — the raw-SQLite monthly sum never contains the baseline, so subtracting it (meant for the summary fallback) inflated the manual target (target $60 with $12 raw spend produced a $72 baseline).
+- **`[Internal]` `buildSummaryFromRows` reported `sqliteAvailable: false`** for SQLite-backed summaries (only masked by the enriched builder overriding it).
+- **`[Internal]` Error classification hardened against hosts without a global `DOMException`.**
+
 - **`[Provider]` Duplicate OpenCode Go/Zen models after setting a per-model option (e.g. `reasoningEffort`) in the model picker (#131).** Setting a per-model option makes VS Code write a settings-only group (no `apiKey`) into `chatLanguageModels.json`; VS Code then resolves that group with `configuration: {}`, and the SecretStorage fallback ran on both the groupless call and the group call, serving every model twice (7 → 14 in the report). A group call whose `configuration` is present but carries no API key is now treated as a per-model configuration group and returns `[]`, leaving the groupless call as the single source. Per-model settings still apply at request time via `modelConfiguration`. Documented in `docs/issues/64-20260813-issue131-permodel-config-duplicate-models.md`. PR [#135](https://github.com/ltmoerdani/opencode-copilot-chat/pull/135) by [@Fahad090NP](https://github.com/Fahad090NP).
 
 ## [0.5.2] — 2026-08-11
diff --git a/src/extension.ts b/src/extension.ts
index 6d87d85..2ee4e41 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -330,8 +330,12 @@ function getUserAgent(): string {
  *   AbortSignal.timeout is transient and can be retried.
  */
 function isTransientFetchError(error: unknown): boolean {
-  if (error instanceof DOMException && error.name === "AbortError") return false;
-  if (error instanceof DOMException && error.name === "TimeoutError") return true;
+  // DOMException is a global since Node 17; guard anyway so a hypothetical
+  // older host never crashes inside error classification.
+  if (typeof DOMException === "function" && error instanceof DOMException) {
+    if (error.name === "AbortError") return false;
+    if (error.name === "TimeoutError") return true;
+  }
   const cause = (error as { cause?: { code?: string; name?: string } } | undefined)?.cause;
   const code = cause?.code ?? (error as { code?: string } | undefined)?.code;
   const name = cause?.name ?? (error as { name?: string } | undefined)?.name;
@@ -2713,7 +2717,7 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
         }
         // 2. Classify the error. Timeout (AbortError without token cancel)
         //    and transient network errors are retryable; HTTP 4xx is not.
-        const aborted = error instanceof DOMException && error.name === "AbortError";
+        const aborted = typeof DOMException === "function" && error instanceof DOMException && error.name === "AbortError";
         const transient = aborted || isTransientFetchError(error);
         // 3. On final attempt or non-transient error, fall through to
         //    cache/bundled fallback below.

From 97778980c09b6054d633651282fd60dbd73934e0 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 10:23:52 +0500
Subject: [PATCH 24/43] feat(usage): CLI-backed today/yesterday, codebase row,
 permanent tracking

The OpenCode CLI database stores per-message cost, token breakdowns and the
session's working directory (verified in the upstream schema:
packages/schema/src/v1/session.ts Assistant.tokens/path). The usage card now
uses that data:

- Today/Yesterday merge the CLI history with the extension's tracked requests
  (terminal + VS Code combined); source selectable via
  opencodego.usageTodayYesterdaySource (auto/cli/extension).
- The old 'Session (est)' estimate row is replaced by a 'Codebase' row: all-time
  usage in the CURRENT workspace, matched per-directory via path.cwd, forever
  by default (opencodego.usageCodebaseWindowDays). Toggle: usageCodebaseRow.
- Tracked data is permanent: the 'Reset tracked usage data' action and the
  31-day entry cutoff are removed (hard 2000-entry cap only).
- New display options: usageRollingSessionMeter (hide the server 5h rolling
  meter in detailed views), usageDayBoundary (utc/local midnight).
- sqliteAvailable now true for SQLite-backed summaries; pure helpers
  (sumDailyUsage, isCwdInWorkspace, normalizeCwd, startOfLocalDay) extracted
  and unit-tested (254 tests).
---
 CHANGELOG.md                    |   5 +
 package.json                    |  45 ++++++
 src/config.ts                   |  25 +++
 src/extension.ts                | 127 ++++++++-------
 src/goUsageTracker.ts           | 268 +++++++++++++++++++++++++-------
 src/test/goUsageSync.test.ts    |   1 +
 src/test/goUsageTracker.test.ts |  85 ++++++++++
 7 files changed, 446 insertions(+), 110 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 479d1d9..6bb421c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,11 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
+- **`[Usage]` Today/Yesterday now merge the OpenCode CLI history with extension-tracked usage.** The CLI database (`~/.local/share/opencode/opencode.db`) stores per-message `cost` + `tokens.{input,output,reasoning,cache}` + `path.cwd` + timestamps, so users who also run OpenCode in the terminal get their real combined daily totals (terminal + VS Code) instead of VS Code-only estimates. Configurable via `opencodego.usageTodayYesterdaySource` (`auto` / `cli` / `extension`).
+- **`[Usage]` New "Codebase" row replaces the old "Session (est)" estimate.** Shows all-time usage for the CURRENT workspace (matched per-directory from the CLI history `path.cwd`), forever by default (`opencodego.usageCodebaseWindowDays`, 0 = all history). Toggle with `opencodego.usageCodebaseRow`.
+- **`[Usage]` Local tracked data is permanent.** The "Reset tracked usage data" action is removed and the 31-day entry cutoff is gone (only the hard 2000-entry cap applies) — the data today/yesterday/codebase rely on can no longer be deleted or silently expire.
+- **`[Usage]` New display options:** `opencodego.usageRollingSessionMeter` (hide the server 5-hour rolling meter in detailed views) and `opencodego.usageDayBoundary` (`utc` / `local` midnight for the Today/Yesterday rows).
+
 - **`[Internal]` `sanitizeToolSchema` emitted `type: "object"` via a ternary whose branches were identical** — collapsed to the constant.
 - **`[Internal]` Anthropic stream extractor wrote usage fields onto itself** instead of the request summary — the real summary was already updated by the SSE data callback, so the duplicate (and wrong-object) write is gone.
 - **`[Internal]` `formatModalityBadges` duplicated its Audio branch** under two conditions that covered all cases — collapsed.
diff --git a/package.json b/package.json
index b02bc66..2fedc2b 100644
--- a/package.json
+++ b/package.json
@@ -138,6 +138,51 @@
     "configuration": {
       "title": "OpenCode",
       "properties": {
+        "opencodego.usageTodayYesterdaySource": {
+          "type": "string",
+          "enum": [
+            "auto",
+            "cli",
+            "extension"
+          ],
+          "enumDescriptions": [
+            "Merge the OpenCode CLI history (cost + tokens + requests) with the extension's own tracked requests — the most accurate view when you also use OpenCode in the terminal.",
+            "OpenCode CLI history only — ignores requests the extension tracked itself.",
+            "Extension-tracked requests only — ignores the OpenCode CLI history."
+          ],
+          "default": "auto",
+          "description": "Data source for the Today / Yesterday usage rows."
+        },
+        "opencodego.usageCodebaseRow": {
+          "type": "boolean",
+          "default": true,
+          "description": "Show the all-time usage row for the current workspace (Codebase), computed from the OpenCode CLI history (per-directory `path.cwd` of each session's messages)."
+        },
+        "opencodego.usageCodebaseWindowDays": {
+          "type": "number",
+          "default": 0,
+          "minimum": 0,
+          "maximum": 3650,
+          "description": "How many days of history the Codebase row covers. 0 = forever (all history)."
+        },
+        "opencodego.usageRollingSessionMeter": {
+          "type": "boolean",
+          "default": true,
+          "description": "Show the server-accurate 5-hour rolling session meter in the usage tooltip, quick-pick and panel. Weekly and monthly meters are always shown."
+        },
+        "opencodego.usageDayBoundary": {
+          "type": "string",
+          "enum": [
+            "utc",
+            "local"
+          ],
+          "enumDescriptions": [
+            "Today / Yesterday rows roll over at midnight UTC.",
+            "Today / Yesterday rows roll over at your local midnight."
+          ],
+          "default": "utc",
+          "description": "Day boundary used for the Today / Yesterday usage rows."
+        },
         "opencodego.temperature": {
           "type": "number",
           "default": 0.2,
diff --git a/src/config.ts b/src/config.ts
index 28e1137..e251e09 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -155,6 +155,31 @@ export const GO_MAX_LOG_ENTRIES = 2000;
 export const GO_SESSION_IDLE_MS = 2 * 60 * 60 * 1000;
 export const GO_MAX_SESSIONS = 50;
 
+// ─── Usage display options ────────────────────────────────────────────────────
+
+/**
+ * Source of the Today/Yesterday device-local rows:
+ * - "auto"      — merge the OpenCode CLI history (cost + tokens + requests)
+ *                 with the extension's own tracked requests (best accuracy).
+ * - "cli"       — OpenCode CLI history only (extension-tracked requests omitted).
+ * - "extension" — the extension's tracked requests only (CLI history ignored).
+ */
+export type UsageTodayYesterdaySource = "auto" | "cli" | "extension";
+export const SETTING_USAGE_TODAY_YESTERDAY_SOURCE = "usageTodayYesterdaySource";
+export const DEFAULT_USAGE_TODAY_YESTERDAY_SOURCE: UsageTodayYesterdaySource = "auto";
+/** Show the all-time usage row for the current workspace (from OpenCode CLI history). */
+export const SETTING_USAGE_CODEBASE_ROW = "usageCodebaseRow";
+export const DEFAULT_USAGE_CODEBASE_ROW = true;
+/** Codebase window in days; 0 = forever (all history). */
+export const SETTING_USAGE_CODEBASE_WINDOW_DAYS = "usageCodebaseWindowDays";
+export const DEFAULT_USAGE_CODEBASE_WINDOW_DAYS = 0;
+/** Show the server-accurate 5-hour rolling session meter in detailed views. */
+export const SETTING_USAGE_ROLLING_SESSION_METER = "usageRollingSessionMeter";
+export const DEFAULT_USAGE_ROLLING_SESSION_METER = true;
+/** Day boundary used for the Today/Yesterday rows. */
+export const SETTING_USAGE_DAY_BOUNDARY = "usageDayBoundary";
+export const DEFAULT_USAGE_DAY_BOUNDARY = "utc";
+
 // ─── Usage profiles (issue #63) ──────────────────────────────────────────────
 
 export const PROFILES_REGISTRY_KEY = "opencodego.profiles.v1";
diff --git a/src/extension.ts b/src/extension.ts
index 2ee4e41..096d529 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -114,6 +114,17 @@ import {
   TOOL_RESULT_TOKEN_OVERHEAD,
   VISION_PROXY_MODEL_ID_KEY,
   VISION_PROXY_PROMPT_KEY,
+  DEFAULT_USAGE_CODEBASE_ROW,
+  DEFAULT_USAGE_CODEBASE_WINDOW_DAYS,
+  DEFAULT_USAGE_DAY_BOUNDARY,
+  DEFAULT_USAGE_ROLLING_SESSION_METER,
+  DEFAULT_USAGE_TODAY_YESTERDAY_SOURCE,
+  SETTING_USAGE_CODEBASE_ROW,
+  SETTING_USAGE_CODEBASE_WINDOW_DAYS,
+  SETTING_USAGE_DAY_BOUNDARY,
+  SETTING_USAGE_ROLLING_SESSION_METER,
+  SETTING_USAGE_TODAY_YESTERDAY_SOURCE,
+  type UsageTodayYesterdaySource,
 } from "./config";
 import { escapeHtml, formatRelativeTime, formatTokenCount, formatUsd, getErrorMessage, isRecord, sleep, toFiniteNumber } from "./utils";
 import { parseToolInput as parseToolInputShared } from "./toolCallAccumulator";
@@ -126,6 +137,7 @@ import {
   formatGoUsageStatusBarText,
   buildUsageQuickPickItems,
   estimateCost,
+  type GoUsageTrackerOptions,
   type UsageBaselineTargets,
 } from "./goUsageTracker";
 import { resolveResponseApiKey } from "./apiKeyResolution";
@@ -172,6 +184,33 @@ let usageWebviewPanel: vscode.WebviewPanel | undefined;
 let profilesCache: UsageProfile[] = [];
 let activeProfileFingerprint: string = LEGACY_FINGERPRINT;
 
+/**
+ * Resolvers for the per-view usage knobs, read live from configuration so
+ * changing a setting repaints the status bar / tooltip / card immediately.
+ */
+function usageTrackerOptions(): GoUsageTrackerOptions {
+  const config = () => vscode.workspace.getConfiguration(CONFIG_SECTION);
+  return {
+    resolveWorkspaceFolders: () => vscode.workspace.workspaceFolders?.map((folder) => folder.uri.fsPath) ?? [],
+    resolveTodayYesterdaySource: () =>
+      config().get<UsageTodayYesterdaySource>(SETTING_USAGE_TODAY_YESTERDAY_SOURCE, DEFAULT_USAGE_TODAY_YESTERDAY_SOURCE),
+    resolveCodebaseWindowDays: () => config().get<number>(SETTING_USAGE_CODEBASE_WINDOW_DAYS, DEFAULT_USAGE_CODEBASE_WINDOW_DAYS),
+    resolveDayBoundary: () => config().get<"utc" | "local">(SETTING_USAGE_DAY_BOUNDARY, DEFAULT_USAGE_DAY_BOUNDARY),
+  };
+}
+
+/** Whether the detailed usage views show the server 5h rolling meter. */
+function usageRollingMeterVisible(): boolean {
+  return vscode.workspace
+    .getConfiguration(CONFIG_SECTION)
+    .get<boolean>(SETTING_USAGE_ROLLING_SESSION_METER, DEFAULT_USAGE_ROLLING_SESSION_METER);
+}
+
+/** Whether the detailed usage views show the all-time codebase row. */
+function usageCodebaseRowVisible(): boolean {
+  return vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_USAGE_CODEBASE_ROW, DEFAULT_USAGE_CODEBASE_ROW);
+}
+
 /** Look up (or create) the GoUsageTracker for a given key fingerprint. */
 function getOrCreateTracker(fingerprint: string): GoUsageTracker {
   // The singleton tracker does not have a storage suffix
@@ -185,6 +224,7 @@ function getOrCreateTracker(fingerprint: string): GoUsageTracker {
     },
     (modelId) => modelMetadataSnapshot?.providers[GO_VENDOR]?.[modelId]?.cost,
     fingerprint,
+    usageTrackerOptions(),
   );
   goUsageTrackers.set(fingerprint, tracker);
   return tracker;
@@ -712,6 +752,8 @@ export function activate(context: vscode.ExtensionContext) {
     (modelId) => {
       return modelMetadataSnapshot?.providers[GO_VENDOR]?.[modelId]?.cost;
     },
+    "",
+    usageTrackerOptions(),
   );
   _extensionContext = context;
   _usageLogChannel = goUsageLogChannel;
@@ -778,22 +820,22 @@ export function activate(context: vscode.ExtensionContext) {
       const tracker = activeGoUsageTracker();
       if (!tracker) return;
       const summary = tracker.getSummary();
-      const items = buildUsageQuickPickItems(summary, tracker.hasServerUsage);
-
-      const sessionCost = tracker.getCurrentSessionCost();
-      if (sessionCost && sessionCost.cost > 0) {
-        const totalTokens = sessionCost.promptTokens + sessionCost.completionTokens;
-        const sessionItem: vscode.QuickPickItem = {
-          label: `$(comment) Latest Session (est)`,
-          description: `$${sessionCost.cost.toFixed(4)}`,
-          detail: `${formatTokenCount(totalTokens)} tokens · ${String(sessionCost.requests)} requests`,
+      const items = buildUsageQuickPickItems(summary, tracker.hasServerUsage, usageRollingMeterVisible());
+
+      // All-time usage in the current workspace (from the OpenCode CLI
+      // history) — replaces the old "Latest Session (est)" estimate row.
+      if (usageCodebaseRowVisible()) {
+        const codebaseItem: vscode.QuickPickItem = {
+          label: "$(repo) Codebase (all-time)",
+          description: formatUsd(summary.codebase.cost),
+          detail: `${formatTokenCount(summary.codebase.tokens)} tokens · ${String(summary.codebase.requests)} requests`,
           alwaysShow: true,
         };
         const dailyIdx = items.findIndex((i) => i.kind === vscode.QuickPickItemKind.Separator && i.label === "Daily Summary");
         if (dailyIdx >= 0) {
-          items.splice(dailyIdx + 1, 0, sessionItem);
+          items.splice(dailyIdx + 1, 0, codebaseItem);
         } else {
-          items.push(sessionItem);
+          items.push(codebaseItem);
         }
       }
 
@@ -842,17 +884,6 @@ export function activate(context: vscode.ExtensionContext) {
         vscode.commands.executeCommand("opencodego.showUsageDetails");
       } else if (action === "openConsole") {
         void vscode.env.openExternal(vscode.Uri.parse("https://opencode.ai"));
-      } else if (action === "resetTracked") {
-        const confirm = await vscode.window.showWarningMessage(
-          "Reset all locally tracked usage data (Today, Yesterday, session spend)? Server-synced meters are unaffected.",
-          { modal: true },
-          "Reset",
-        );
-        if (confirm !== "Reset") return;
-        tracker.clear();
-        refreshGoUsageStatusBar();
-        updateWebviewContent();
-        vscode.window.showInformationMessage("Locally tracked usage data cleared.");
       } else if (action === "switchProfile" && "_fp" in picked) {
         void setActiveProfile((picked as { _fp: string })._fp);
       }
@@ -1277,7 +1308,7 @@ function refreshGoUsageStatusBar(): void {
   const activeProfile = findProfile(profilesCache, activeProfileFingerprint);
   const baseText = formatGoUsageStatusBarText(s);
   goUsageStatusBarItem.text = activeProfile && profilesCache.length > 1 ? `${baseText} [${activeProfile.label}]` : baseText;
-  goUsageStatusBarItem.tooltip = buildUsageTooltip(s, tracker.getCurrentSessionCost());
+  goUsageStatusBarItem.tooltip = buildUsageTooltip(s);
   goUsageStatusBarItem.show();
   updateWebviewContent();
 
@@ -1426,12 +1457,13 @@ function updateWebviewContent(): void {
       <div class="card">
         <div class="title">${escapeHtml(profileLabel)} - Usage</div>
 
-        ${usageCardSectionHtml("Session (5h rolling)", s.session)}
+        ${usageRollingMeterVisible() ? usageCardSectionHtml("Session (5h rolling)", s.session) : ""}
         ${usageCardSectionHtml("Weekly", s.weekly)}
         ${usageCardSectionHtml("Monthly", s.monthly)}
 
         <div class="divider"></div>
 
+        ${usageCodebaseRowVisible() ? usageCardStatsHtml("Codebase (all-time)", s.codebase) : ""}
         ${usageCardStatsHtml("Today", s.today)}
         ${usageCardStatsHtml("Yesterday", s.yesterday)}
 
@@ -1475,10 +1507,7 @@ function usageCardStatsHtml(label: string, day: _UsageSummary["today"]): string
   ].join("");
 }
 
-function buildUsageTooltip(
-  s: ReturnType<GoUsageTracker["getSummary"]>,
-  sessionCost?: { cost: number; requests: number; promptTokens: number; completionTokens: number },
-): vscode.MarkdownString {
+function buildUsageTooltip(s: ReturnType<GoUsageTracker["getSummary"]>): vscode.MarkdownString {
   const md = new vscode.MarkdownString("", true);
   md.supportHtml = true;
   md.isTrusted = true;
@@ -1488,7 +1517,7 @@ function buildUsageTooltip(
   // The hover shows the summary card only; Set spent targets / Rename are
   // available from the Command Palette (opencodego.setUsageTargets,
   // opencodego.renameActiveProfile).
-  md.appendMarkdown(`<img alt="Go usage summary" src="${usageTooltipSvgDataUri(s, sessionCost, profileLabel)}" width="440">`);
+  md.appendMarkdown(`<img alt="Go usage summary" src="${usageTooltipSvgDataUri(s, profileLabel)}" width="440">`);
   return md;
 }
 
@@ -1599,20 +1628,12 @@ async function showUsageTargetEditor(tracker: GoUsageTracker): Promise<UsageBase
 
 type _UsageSummary = ReturnType<GoUsageTracker["getSummary"]>;
 
-function usageTooltipSvgDataUri(
-  s: _UsageSummary,
-  sc?: { cost: number; requests: number; promptTokens: number; completionTokens: number },
-  profileLabel?: string,
-): string {
-  const svg = buildUsageTooltipSvg(s, sc, profileLabel);
+function usageTooltipSvgDataUri(s: _UsageSummary, profileLabel?: string): string {
+  const svg = buildUsageTooltipSvg(s, profileLabel);
   return `data:image/svg+xml;utf8,${encodeURIComponent(svg)}`;
 }
 
-function buildUsageTooltipSvg(
-  s: _UsageSummary,
-  sc?: { cost: number; requests: number; promptTokens: number; completionTokens: number },
-  profileLabel?: string,
-): string {
+function buildUsageTooltipSvg(s: _UsageSummary, profileLabel?: string): string {
   // Stable geometry: fixed card width and fixed columns, so the layout never
   // shifts when session data appears or a day has no usage yet.
   const width = 440;
@@ -1673,28 +1694,24 @@ ${text(noDataMsg ?? "No usage data yet. Send a chat message to start tracking.",
   // Title starts at the same 14px gutter as the sides. Meter rows, the
   // divider and the device rows keep a consistent 14px rhythm.
   const meterRows = [
-    ["Session (5h rolling)", s.session, 56],
+    ...(usageRollingMeterVisible() ? ([["Session (5h rolling)", s.session, 56]] as const) : []),
     ["Weekly", s.weekly, 116],
     ["Monthly", s.monthly, 176],
   ] as const;
-  const dividerY = 226;
-  const firstRowY = 248;
+  const dividerY = 46 + meterRows.length * 60;
+  const firstRowY = dividerY + 22;
   const rowGap = 24;
   // All three rows are always rendered (zeros included) so the card is
   // stable regardless of whether a session is currently active.
-  const sessionCost = sc && sc.cost > 0 ? sc : { cost: 0, requests: 0, promptTokens: 0, completionTokens: 0 };
   const deviceRows: Array<[string, number, number, number, number]> = [];
-  deviceRows.push([
-    "Session (est):",
-    sessionCost.cost,
-    sessionCost.requests,
-    sessionCost.promptTokens + sessionCost.completionTokens,
-    firstRowY,
-  ]);
-  deviceRows.push(["Today:", s.today.cost, s.today.requests, s.today.tokens, firstRowY + rowGap]);
-  deviceRows.push(["Yesterday:", s.yesterday.cost, s.yesterday.requests, s.yesterday.tokens, firstRowY + 2 * rowGap]);
-
-  const height = firstRowY + 2 * rowGap + 14;
+  if (usageCodebaseRowVisible()) {
+    deviceRows.push(["Codebase:", s.codebase.cost, s.codebase.requests, s.codebase.tokens, firstRowY]);
+  }
+  const codebaseOffset = usageCodebaseRowVisible() ? 1 : 0;
+  deviceRows.push(["Today:", s.today.cost, s.today.requests, s.today.tokens, firstRowY + codebaseOffset * rowGap]);
+  deviceRows.push(["Yesterday:", s.yesterday.cost, s.yesterday.requests, s.yesterday.tokens, firstRowY + (codebaseOffset + 1) * rowGap]);
+
+  const height = firstRowY + (deviceRows.length - 1) * rowGap + 14;
 
   return `<svg xmlns="http://www.w3.org/2000/svg" width="${width}" height="${height}" viewBox="0 0 ${width} ${height}">
 ${text(svgTitle, padX, 28, 16, 700)}
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index 84beeaa..c045416 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -18,6 +18,7 @@ import {
   GO_MAX_LOG_ENTRIES,
   GO_SESSION_IDLE_MS,
   GO_MAX_SESSIONS,
+  type UsageTodayYesterdaySource,
 } from "./config";
 import { formatTokenCount, formatUsd, formatRelativeTime } from "./utils";
 
@@ -97,22 +98,31 @@ export interface UsageSummary {
   session: PeriodUsage;
   weekly: PeriodUsage;
   monthly: PeriodUsage;
-  today: {
-    cost: number;
-    requests: number;
-    tokens: number;
-  };
-  yesterday: {
-    cost: number;
-    requests: number;
-    tokens: number;
-  };
+  today: UsageDaily;
+  yesterday: UsageDaily;
+  /** All-time usage in the CURRENT workspace (from OpenCode CLI history). */
+  codebase: UsageDaily;
   hasData: boolean;
   /** When true, cost data comes from the OpenCode CLI SQLite database
       (actual billed amounts). When false, costs are estimated locally. */
   sqliteAvailable: boolean;
 }
 
+/**
+ * Per-view knobs resolved live so the user can pick how usage is presented.
+ * All resolvers are optional — the tracker falls back to sensible defaults.
+ */
+export interface GoUsageTrackerOptions {
+  /** Absolute paths of the current VS Code workspace folders. */
+  resolveWorkspaceFolders?: () => readonly string[];
+  /** Source of the Today/Yesterday rows (default "auto"). */
+  resolveTodayYesterdaySource?: () => UsageTodayYesterdaySource;
+  /** Codebase window in days; 0 = forever (default). */
+  resolveCodebaseWindowDays?: () => number;
+  /** Day boundary for Today/Yesterday ("utc" default | "local"). */
+  resolveDayBoundary?: () => "utc" | "local";
+}
+
 interface UsageBaselinePeriod {
   amount: number;
   expiresAt: number;
@@ -146,6 +156,42 @@ function startOfUtcDay(nowMs: number): number {
   return Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate());
 }
 
+/** Start of the LOCAL day — used when `usageDayBoundary` is set to "local". */
+export function startOfLocalDay(nowMs: number): number {
+  const d = new Date(nowMs);
+  return new Date(d.getFullYear(), d.getMonth(), d.getDate()).getTime();
+}
+
+/** Normalize a directory path for matching (trailing separators, Windows case). */
+export function normalizeCwd(value: string): string {
+  let normalized = value.replace(/[\/]+$/, "");
+  if (process.platform === "win32") {
+    normalized = normalized.toLowerCase();
+  }
+  return normalized;
+}
+
+/**
+ * Whether a CLI row's working directory belongs to the current workspace.
+ * Matches when the folder equals the cwd, is a parent of it (the user opened
+ * the repo root but the CLI ran in a subfolder), or the folder is a subfolder
+ * of the cwd (the user opened a subfolder of the project).
+ */
+export function isCwdInWorkspace(cwd: string | undefined, workspaceFolders: readonly string[]): boolean {
+  if (!cwd || workspaceFolders.length === 0) {
+    return false;
+  }
+  const rowCwd = normalizeCwd(cwd);
+  const sep = process.platform === "win32" ? "\\" : "/";
+  for (const folder of workspaceFolders) {
+    const normalized = normalizeCwd(folder);
+    if (rowCwd === normalized) return true;
+    if (rowCwd.startsWith(`${normalized}${sep}`)) return true;
+    if (normalized.startsWith(`${rowCwd}${sep}`)) return true;
+  }
+  return false;
+}
+
 function startOfUtcWeek(nowMs: number): number {
   const d = new Date(nowMs);
   const offset = (d.getUTCDay() + 6) % 7; // Monday=0
@@ -258,7 +304,12 @@ const OPENCODE_DB_PATH = path.join(os.homedir(), ".local", "share", "opencode",
 const HISTORY_ROWS_SQL = `
   SELECT
     CAST(COALESCE(json_extract(data, '$.time.created'), time_created) AS INTEGER) AS createdMs,
-    CAST(json_extract(data, '$.cost') AS REAL) AS cost
+    CAST(json_extract(data, '$.cost') AS REAL) AS cost,
+    CAST(json_extract(data, '$.tokens.input') AS INTEGER) AS tokensInput,
+    CAST(json_extract(data, '$.tokens.output') AS INTEGER) AS tokensOutput,
+    CAST(json_extract(data, '$.tokens.reasoning') AS INTEGER) AS tokensReasoning,
+    CAST(json_extract(data, '$.tokens.cache.read') AS INTEGER) AS tokensCacheRead,
+    json_extract(data, '$.path.cwd') AS cwd
   FROM message
   WHERE json_valid(data)
     AND json_extract(data, '$.providerID') = 'opencode-go'
@@ -266,9 +317,64 @@ const HISTORY_ROWS_SQL = `
     AND json_type(data, '$.cost') IN ('integer', 'real')
 `;
 
-interface HistoryRow {
+export interface HistoryRow {
   createdMs: number;
   cost: number;
+  tokensInput: number;
+  tokensOutput: number;
+  tokensReasoning: number;
+  tokensCacheRead: number;
+  /** Working directory of the session the message belongs to (OpenCode CLI data). */
+  cwd?: string;
+}
+
+/** Non-negative finite integer (tokens can legitimately be 0). */
+function positiveNumberish(value: unknown): number {
+  return typeof value === "number" && Number.isFinite(value) && value >= 0 ? Math.floor(value) : 0;
+}
+
+/**
+ * Sum one day window across the OpenCode CLI history rows and the extension's
+ * tracked entries. The CLI records terminal usage and the extension records
+ * VS Code usage — they never overlap, so the sum is the user's real combined
+ * usage for the window. `source` selects which inputs participate.
+ */
+export function sumDailyUsage(
+  rows: HistoryRow[],
+  entries: UsageLogEntry[],
+  dayStartMs: number,
+  source: UsageTodayYesterdaySource = "auto",
+): UsageDaily {
+  let cost = 0;
+  let requests = 0;
+  let tokens = 0;
+
+  if (source !== "extension") {
+    for (const row of rows) {
+      if (row.createdMs < dayStartMs) continue;
+      cost += row.cost;
+      requests += 1;
+      tokens += row.tokensInput + row.tokensOutput + row.tokensReasoning;
+    }
+  }
+
+  if (source !== "cli") {
+    for (const entry of entries) {
+      if (entry.timestamp < dayStartMs) continue;
+      cost += entry.cost;
+      requests += 1;
+      tokens += entry.promptTokens + entry.completionTokens;
+    }
+  }
+
+  return { cost, requests, tokens };
+}
+
+/** Per-day / per-workspace usage totals (from CLI history and/or extension tracking). */
+export interface UsageDaily {
+  cost: number;
+  requests: number;
+  tokens: number;
 }
 
 function readOpenCodeHistory(): HistoryRow[] | null {
@@ -282,13 +388,23 @@ function readOpenCodeHistory(): HistoryRow[] | null {
     });
     const rows: unknown = JSON.parse(result);
     if (!Array.isArray(rows)) return null;
-    return rows.filter((row): row is HistoryRow => {
-      if (!row || typeof row !== "object") return false;
-      const candidate = row as Partial<HistoryRow>;
-      return (
-        typeof candidate.createdMs === "number" && candidate.createdMs > 0 && typeof candidate.cost === "number" && candidate.cost >= 0
-      );
-    });
+    return rows
+      .filter((row): row is HistoryRow => {
+        if (!row || typeof row !== "object") return false;
+        const candidate = row as Partial<HistoryRow>;
+        return (
+          typeof candidate.createdMs === "number" && candidate.createdMs > 0 && typeof candidate.cost === "number" && candidate.cost >= 0
+        );
+      })
+      .map((row) => ({
+        createdMs: row.createdMs,
+        cost: row.cost,
+        tokensInput: positiveNumberish(row.tokensInput),
+        tokensOutput: positiveNumberish(row.tokensOutput),
+        tokensReasoning: positiveNumberish(row.tokensReasoning),
+        tokensCacheRead: positiveNumberish(row.tokensCacheRead),
+        cwd: typeof row.cwd === "string" && row.cwd.trim() ? row.cwd : undefined,
+      }));
   } catch {
     return null;
   }
@@ -328,6 +444,7 @@ export class GoUsageTracker {
      * (single account, shared key).
      */
     private readonly storageKeySuffix = "",
+    private readonly options: GoUsageTrackerOptions = {},
   ) {
     this.log = log;
     this.costResolver = costResolver;
@@ -475,6 +592,47 @@ export class GoUsageTracker {
     return this.serverUsage ? mergeServerUsage(summary, this.serverUsage, GO_LIMITS) : summary;
   }
 
+  private dayStartMs(nowMs: number): number {
+    return this.options.resolveDayBoundary?.() === "local" ? startOfLocalDay(nowMs) : startOfUtcDay(nowMs);
+  }
+
+  private todayYesterdaySource(): UsageTodayYesterdaySource {
+    return this.options.resolveTodayYesterdaySource?.() ?? "auto";
+  }
+
+  /**
+   * Merge the OpenCode CLI history rows and the extension-tracked entries for
+   * one day window into a single total. The CLI DB records terminal usage and
+   * the extension records VS Code usage — the two never overlap, so summing
+   * them gives the user's real combined daily usage.
+   */
+  private dailyUsage(rows: HistoryRow[], dayStartMs: number): UsageDaily {
+    return sumDailyUsage(rows, this.entries, dayStartMs, this.todayYesterdaySource());
+  }
+
+  /**
+   * All-time usage in the CURRENT workspace, derived from the OpenCode CLI
+   * history (`path.cwd` of each session's messages). "Forever" by default —
+   * the window is controlled by `resolveCodebaseWindowDays` (0 = all history).
+   */
+  private codebaseUsage(rows: HistoryRow[]): UsageDaily {
+    const folders = this.options.resolveWorkspaceFolders?.() ?? [];
+    const windowDays = Math.max(0, this.options.resolveCodebaseWindowDays?.() ?? 0);
+    const cutoffMs = windowDays > 0 ? Date.now() - windowDays * 24 * 60 * 60 * 1000 : 0;
+
+    let cost = 0;
+    let requests = 0;
+    let tokens = 0;
+    for (const row of rows) {
+      if (cutoffMs > 0 && row.createdMs < cutoffMs) continue;
+      if (!isCwdInWorkspace(row.cwd, folders)) continue;
+      cost += row.cost;
+      requests += 1;
+      tokens += row.tokensInput + row.tokensOutput + row.tokensReasoning;
+    }
+    return { cost, requests, tokens };
+  }
+
   /**
    * Fetch server-accurate account-wide usage for this profile's key and
    * cache it for {@link GO_USAGE_SYNC_TTL_MS}. Safe to call on every
@@ -519,24 +677,17 @@ export class GoUsageTracker {
     return true;
   }
 
-  /** Build summary from SQLite, enriched with token/request counts from tracked entries. */
+  /** Build summary from SQLite, enriched with merged today/yesterday + codebase totals. */
   private buildSqliteEnrichedSummary(nowMs: number, rows: HistoryRow[], clamp: (v: number, limit: number) => number): UsageSummary {
     const base = this.buildSummaryFromRows(nowMs, rows, clamp);
 
-    // Enrich today/yesterday tokens+requests from tracked entries (SQLite doesn't store tokens).
-    const dayMs = startOfUtcDay(nowMs);
+    // Today/Yesterday merge the CLI history (cost + tokens + requests) with
+    // the extension's own tracked requests — the two never overlap, so the
+    // sum is the user's real combined usage for the day.
+    const dayMs = this.dayStartMs(nowMs);
     const yesterdayMs = dayMs - 24 * 60 * 60 * 1000;
-    const todayReq = base.today.requests;
-    let todayTokens = 0;
-    const yestReq = base.yesterday.requests;
-    let yestTokens = 0;
-    for (const e of this.entries) {
-      if (e.timestamp >= dayMs) {
-        todayTokens += e.promptTokens + e.completionTokens;
-      } else if (e.timestamp >= yesterdayMs) {
-        yestTokens += e.promptTokens + e.completionTokens;
-      }
-    }
+    const today = this.dailyUsage(rows, dayMs);
+    const yesterday = this.dailyUsage(rows, yesterdayMs);
 
     // Apply baselines on top of SQLite costs.
     const activeBaselineSession = this.getActiveBaselineAmount("session", nowMs);
@@ -559,8 +710,9 @@ export class GoUsageTracker {
         spent: Math.round((base.monthly.spent + activeBaselineMonthly) * 10000) / 10000,
         percent: clamp(base.monthly.spent + activeBaselineMonthly, GO_LIMITS.monthly),
       },
-      today: { ...base.today, requests: todayReq, tokens: todayTokens },
-      yesterday: { ...base.yesterday, requests: yestReq, tokens: yestTokens },
+      today,
+      yesterday,
+      codebase: this.codebaseUsage(rows),
       hasData: true,
       sqliteAvailable: true,
     };
@@ -638,7 +790,8 @@ export class GoUsageTracker {
         tokens: 0,
       },
       hasData: true,
-      sqliteAvailable: false,
+      sqliteAvailable: true,
+      codebase: { cost: 0, requests: 0, tokens: 0 },
     };
   }
 
@@ -650,7 +803,7 @@ export class GoUsageTracker {
 
   /** Build summary from extension-tracked entries (fallback when opencode.db unavailable) */
   private buildSummaryFromTracked(nowMs: number, clamp: (v: number, limit: number) => number): UsageSummary {
-    const dayMs = startOfUtcDay(nowMs);
+    const dayMs = this.dayStartMs(nowMs);
     const yesterdayMs = dayMs - 24 * 60 * 60 * 1000;
     const weekMs = startOfUtcWeek(nowMs);
     const { monthStartMs, monthEndMs } = buildMonthlyWindow(nowMs, this.baseline);
@@ -724,6 +877,14 @@ export class GoUsageTracker {
         requests: yestReq,
         tokens: yestTokens,
       },
+      // Without the CLI history there is no per-directory attribution, so the
+      // codebase total falls back to everything this extension has tracked
+      // (it only ever runs inside the current workspace).
+      codebase: {
+        cost: Math.round(this.entries.reduce((total, e) => total + e.cost, 0) * 10000) / 10000,
+        requests: this.entries.length,
+        tokens: this.entries.reduce((total, e) => total + e.promptTokens + e.completionTokens, 0),
+      },
       hasData: this.entries.length > 0 || this.everTracked,
       sqliteAvailable: false,
     };
@@ -860,8 +1021,10 @@ export class GoUsageTracker {
   }
 
   private prune(): void {
-    const cutoff = Date.now() - 31 * 24 * 60 * 60 * 1000; // 31 days
-    this.entries = this.entries.filter((e) => e.timestamp > cutoff).slice(-MAX_LOG_ENTRIES);
+    // Tracked usage is permanent — users rely on the history for today/
+    // yesterday/codebase totals, so no time-based cutoff. Only the hard
+    // entry cap applies.
+    this.entries = this.entries.slice(-MAX_LOG_ENTRIES);
   }
 
   /** Remove idle sessions and cap total count. */
@@ -981,7 +1144,7 @@ export function formatGoUsageStatusBarText(summary: UsageSummary): string {
 }
 
 /** Build Quick Pick items for the usage panel */
-export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer = false): vscode.QuickPickItem[] {
+export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer = false, showRollingMeter = true): vscode.QuickPickItem[] {
   const now = new Date();
   const isEmpty = !summary.hasData;
 
@@ -1019,14 +1182,16 @@ export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer
   // ── Period bars ──────────────────────────────────────────────────────────
   items.push({ label: "Subscription Limits", kind: vscode.QuickPickItemKind.Separator });
 
-  items.push(
-    periodItem(
-      percentColor(summary.session.percent) + " $(clock)",
-      "Session (5h rolling)",
-      summary.session,
-      fmtDate(summary.session.resetsAt),
-    ),
-  );
+  if (showRollingMeter) {
+    items.push(
+      periodItem(
+        percentColor(summary.session.percent) + " $(clock)",
+        "Session (5h rolling)",
+        summary.session,
+        fmtDate(summary.session.resetsAt),
+      ),
+    );
+  }
 
   items.push(periodItem(percentColor(summary.weekly.percent) + " $(calendar)", "Weekly", summary.weekly, fmtDate(summary.weekly.resetsAt)));
 
@@ -1063,13 +1228,6 @@ export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer
     _action: "openConsole",
   } as vscode.QuickPickItem & { _action: string });
 
-  items.push({
-    label: "$(trash) Reset tracked usage data",
-    description: "Clears all locally tracked data",
-    alwaysShow: true,
-    _action: "resetTracked",
-  } as vscode.QuickPickItem & { _action: string });
-
   return items;
 }
 
diff --git a/src/test/goUsageSync.test.ts b/src/test/goUsageSync.test.ts
index 6409b60..3fcf801 100644
--- a/src/test/goUsageSync.test.ts
+++ b/src/test/goUsageSync.test.ts
@@ -14,6 +14,7 @@ function localSummary(): UsageSummary {
     monthly: { spent: 9, limit: LIMITS.monthly, percent: 15, resetsAt: new Date("2026-08-31T00:00:00Z") },
     today: { cost: 0.4, requests: 3, tokens: 4200 },
     yesterday: { cost: 1.1, requests: 8, tokens: 9800 },
+    codebase: { cost: 12.4, requests: 42, tokens: 512_000 },
     hasData: true,
     sqliteAvailable: false,
   };
diff --git a/src/test/goUsageTracker.test.ts b/src/test/goUsageTracker.test.ts
index 6458c8e..01dc757 100644
--- a/src/test/goUsageTracker.test.ts
+++ b/src/test/goUsageTracker.test.ts
@@ -7,6 +7,7 @@ import os from "node:os";
 import type { ModelCost } from "../metadata.js";
 import type { TransportRequestSummary } from "../streaming.js";
 import { GO_USAGE_LOG_KEY, GO_USAGE_BASELINE_KEY, GO_SESSION_COSTS_KEY, GO_SESSION_IDLE_MS, GO_MAX_SESSIONS } from "../config.js";
+import type { HistoryRow, UsageDaily, UsageLogEntry } from "../goUsageTracker.js";
 
 // ── Types (populated by dynamic import in before()) ────────────────────────
 
@@ -19,6 +20,11 @@ let estimateCost: (
   liveCostResolver?: (modelId: string) => ModelCost | undefined,
 ) => number;
 
+let sumDailyUsage: (rows: HistoryRow[], entries: UsageLogEntry[], dayStartMs: number, source?: "auto" | "cli" | "extension") => UsageDaily;
+let isCwdInWorkspace: (cwd: string | undefined, workspaceFolders: readonly string[]) => boolean;
+let normalizeCwd: (value: string) => string;
+let startOfLocalDay: (nowMs: number) => number;
+
 interface SessionSummary {
   sessionId: string;
   cost: number;
@@ -130,6 +136,10 @@ describe("goUsageTracker", () => {
     const mod = await import("../goUsageTracker.js");
     estimateCost = mod.estimateCost;
     GoUsageTracker = mod.GoUsageTracker as GoUsageTrackerConstructor;
+    sumDailyUsage = mod.sumDailyUsage;
+    isCwdInWorkspace = mod.isCwdInWorkspace;
+    normalizeCwd = mod.normalizeCwd;
+    startOfLocalDay = mod.startOfLocalDay;
   });
 
   // ════════════════════════════════════════════════════════════════════════
@@ -601,3 +611,78 @@ describe("goUsageTracker", () => {
     });
   });
 });
+
+describe("sumDailyUsage", () => {
+  const now = new Date();
+  const dayMs = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate());
+  const rows: HistoryRow[] = [
+    { createdMs: dayMs + 1000, cost: 0.1, tokensInput: 100, tokensOutput: 50, tokensReasoning: 20, tokensCacheRead: 10, cwd: "/repo" },
+    { createdMs: dayMs - 60_000, cost: 0.2, tokensInput: 200, tokensOutput: 100, tokensReasoning: 0, tokensCacheRead: 0, cwd: "/repo" },
+  ];
+  const entries: UsageLogEntry[] = [
+    {
+      timestamp: dayMs + 500,
+      modelId: "qwen3.6-plus",
+      cost: 0.05,
+      promptTokens: 30,
+      completionTokens: 10,
+      cachedTokens: 0,
+      sessionId: "s1",
+    },
+  ];
+
+  it("merges CLI rows and extension entries in auto mode", () => {
+    const total = sumDailyUsage(rows, entries, dayMs, "auto");
+    assert.equal(total.requests, 2);
+    assert.equal(total.tokens, 210);
+    assert.ok(Math.abs(total.cost - 0.15) < 1e-9, `expected ~0.15, got ${String(total.cost)}`);
+  });
+
+  it("excludes rows before the day window", () => {
+    const total = sumDailyUsage(rows, [], dayMs, "cli");
+    assert.equal(total.requests, 1, "only the row inside the window counts");
+    assert.equal(total.tokens, 170, "input + output + reasoning");
+  });
+
+  it("cli source ignores extension entries", () => {
+    const total = sumDailyUsage([], entries, dayMs, "cli");
+    assert.deepEqual(total, { cost: 0, requests: 0, tokens: 0 });
+  });
+
+  it("extension source ignores CLI rows", () => {
+    const total = sumDailyUsage(rows, entries, dayMs, "extension");
+    assert.equal(total.requests, 1);
+    assert.equal(total.tokens, 40);
+  });
+});
+
+describe("isCwdInWorkspace / normalizeCwd", () => {
+  it("normalizes trailing separators", () => {
+    assert.equal(normalizeCwd("/repo/"), "/repo");
+    assert.equal(normalizeCwd("/repo//"), "/repo");
+  });
+
+  it("matches exact, parent and subfolder layouts", () => {
+    assert.ok(isCwdInWorkspace("/repo", ["/repo"]));
+    assert.ok(isCwdInWorkspace("/repo/src", ["/repo"]), "CLI ran in a subfolder of the opened repo");
+    assert.ok(isCwdInWorkspace("/repo", ["/repo/src"]), "user opened a subfolder of the project");
+  });
+
+  it("rejects unrelated directories and missing input", () => {
+    assert.ok(!isCwdInWorkspace("/other", ["/repo"]));
+    assert.ok(!isCwdInWorkspace(undefined, ["/repo"]));
+    assert.ok(!isCwdInWorkspace("/repo", []));
+  });
+});
+
+describe("startOfLocalDay", () => {
+  it("returns the local midnight of the given time", () => {
+    const now = new Date();
+    const localMidnight = startOfLocalDay(now.getTime());
+    const d = new Date(localMidnight);
+    assert.equal(d.getHours(), 0);
+    assert.equal(d.getMinutes(), 0);
+    assert.equal(d.getSeconds(), 0);
+    assert.ok(localMidnight <= now.getTime());
+  });
+});

From a11358971bbcb808352e347bc508124d18cc0a2a Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 10:49:57 +0500
Subject: [PATCH 25/43] fix(usage): profile trackers read the CLI history for
 device rows

Per-profile trackers previously skipped the CLI database entirely, so any
multi-account user saw 0 for Today/Yesterday/Codebase even though the
terminal history had everything. The DB is device-level (no per-key column),
so it is now used for the device rows on every tracker; the subscription
meters stay account-scoped (entries for profiles, CLI rows for legacy,
server overlay either way).

Also bumps the extension to 0.6.0 so the reinstall forces a clean
extension-host restart (the previous build shared 0.5.2 with the old one).
---
 package.json          |  2 +-
 src/config.ts         |  2 +-
 src/goUsageTracker.ts | 44 ++++++++++++++++++++++++++-----------------
 3 files changed, 29 insertions(+), 19 deletions(-)

diff --git a/package.json b/package.json
index 2fedc2b..aea960a 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "opencode-copilot-chat",
   "displayName": "OpenCode for Copilot Chat — BYOK 30+ AI Models",
   "description": "Use 30+ frontier AI models (DeepSeek V4, Kimi K2.6, GLM-5.1, Qwen3.7, MiMo V2.5, MiniMax M2.7, free Claude Opus, GPT-5.5, Gemini 3.5, Grok) in GitHub Copilot Chat. Bring Your Own Key — no Copilot Pro needed.",
-  "version": "0.5.2",
+  "version": "0.6.0",
   "publisher": "ltmoerdani",
   "license": "MIT",
   "icon": "media/opencodego.png",
diff --git a/src/config.ts b/src/config.ts
index e251e09..6f3b862 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -22,7 +22,7 @@ export const SECRET_KEY = "opencodego.apiKey";
 /** Client name sent in the `x-opencode-client` header. */
 export const OPEN_CODE_CLIENT = "vscode-copilot-chat";
 /** Fallback only — overridden at runtime from packageJSON.version. */
-export const FALLBACK_USER_AGENT = "opencode-copilot-chat/0.5.2 VSCode";
+export const FALLBACK_USER_AGENT = "opencode-copilot-chat/0.6.0 VSCode";
 /** Configuration section under which all extension settings live. */
 export const CONFIG_SECTION = "opencodego";
 
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index c045416..bbe1e39 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -570,26 +570,36 @@ export class GoUsageTracker {
     const nowMs = Date.now();
     const clamp = (v: number, limit: number) => Math.round(Math.min(100, (v / limit) * 100) * 10) / 10;
 
-    // When namespaced (per-profile), skip the shared SQLite — it has no
-    // key column, so reading it would mix quota from all accounts.
+    // The CLI database is DEVICE-level usage (it has no per-key column), so
+    // it is safe for the device rows (Today / Yesterday / Codebase). The
+    // subscription METERS must stay account-scoped: the legacy (un-namespaced)
+    // tracker derives them from the CLI rows, while per-profile trackers
+    // derive them from their own tracked entries (the server-accurate meters
+    // from syncServerUsage overlay them either way).
     const isPerProfile = this.storageKeySuffix.length > 0;
-    let summary: UsageSummary;
-    if (!isPerProfile) {
-      const sqliteRows = readOpenCodeHistory();
-      if (sqliteRows) {
-        summary = this.buildSqliteEnrichedSummary(nowMs, sqliteRows, clamp);
-      } else {
-        // Fall back to extension-tracked data (works without CLI).
-        summary = this.buildSummaryFromTracked(nowMs, clamp);
-      }
-    } else {
-      summary = this.buildSummaryFromTracked(nowMs, clamp);
+    const sqliteRows = readOpenCodeHistory();
+    if (!isPerProfile && sqliteRows) {
+      return this.serverUsage
+        ? mergeServerUsage(this.buildSqliteEnrichedSummary(nowMs, sqliteRows, clamp), this.serverUsage, GO_LIMITS)
+        : this.buildSqliteEnrichedSummary(nowMs, sqliteRows, clamp);
     }
 
-    // Overlay the server-accurate meters when a recent snapshot exists
-    // (fetched via syncServerUsage). Today / Yesterday / per-session spend
-    // remain local.
-    return this.serverUsage ? mergeServerUsage(summary, this.serverUsage, GO_LIMITS) : summary;
+    // Per-profile, or no CLI history available: meters from tracked entries,
+    // device rows enriched with the CLI history when it exists.
+    const base = this.buildSummaryFromTracked(nowMs, clamp);
+    if (!sqliteRows) {
+      return this.serverUsage ? mergeServerUsage(base, this.serverUsage, GO_LIMITS) : base;
+    }
+    const dayMs = this.dayStartMs(nowMs);
+    const enriched: UsageSummary = {
+      ...base,
+      today: this.dailyUsage(sqliteRows, dayMs),
+      yesterday: this.dailyUsage(sqliteRows, dayMs - 24 * 60 * 60 * 1000),
+      codebase: this.codebaseUsage(sqliteRows),
+      hasData: base.hasData || sqliteRows.length > 0,
+      sqliteAvailable: true,
+    };
+    return this.serverUsage ? mergeServerUsage(enriched, this.serverUsage, GO_LIMITS) : enriched;
   }
 
   private dayStartMs(nowMs: number): number {

From 13c1c4773332794fc7f9f8fd79cb74f048397757 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 10:59:32 +0500
Subject: [PATCH 26/43] feat(usage): compact K/M/B/T formatting everywhere

Token counts render as 1.2T/1.2B/1.2M/12k with unit escalation when rounding
would overflow (999,500 -> 1.0M, never 1000.0M); dollars as $1.23M/$1.50K/
$12.30 with sub-cent precision ($0.0004) so tiny spend never shows $0.00.
Applied across the status-bar tooltip, tooltip card, quick-pick and panel;
status-bar tooltip token lines no longer print raw seven-digit numbers.
---
 CHANGELOG.md           |  2 ++
 src/test/utils.test.ts | 21 +++++++++++++++++++++
 src/usage.ts           |  8 ++++----
 src/utils.ts           | 29 ++++++++++++++++++++++++-----
 4 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6bb421c..b8bac57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
+- **`[Usage]` Compact number formatting everywhere.** Token counts render as `1.2T` / `1.2B` / `1.2M` / `12k` (with correct unit escalation at rounding boundaries — no more `1000.0M`), and dollars as `$1.23M` / `$1.50K` / `$12.30` with sub-cent precision (`$0.0004`) so tiny spend never collapses to `$0.00`. Applied to the status-bar tooltip, tooltip card, quick-pick and usage panel.
+
 - **`[Usage]` Today/Yesterday now merge the OpenCode CLI history with extension-tracked usage.** The CLI database (`~/.local/share/opencode/opencode.db`) stores per-message `cost` + `tokens.{input,output,reasoning,cache}` + `path.cwd` + timestamps, so users who also run OpenCode in the terminal get their real combined daily totals (terminal + VS Code) instead of VS Code-only estimates. Configurable via `opencodego.usageTodayYesterdaySource` (`auto` / `cli` / `extension`).
 - **`[Usage]` New "Codebase" row replaces the old "Session (est)" estimate.** Shows all-time usage for the CURRENT workspace (matched per-directory from the CLI history `path.cwd`), forever by default (`opencodego.usageCodebaseWindowDays`, 0 = all history). Toggle with `opencodego.usageCodebaseRow`.
 - **`[Usage]` Local tracked data is permanent.** The "Reset tracked usage data" action is removed and the 31-day entry cutoff is gone (only the hard 2000-entry cap applies) — the data today/yesterday/codebase rely on can no longer be deleted or silently expire.
diff --git a/src/test/utils.test.ts b/src/test/utils.test.ts
index 154f17f..d49cd56 100644
--- a/src/test/utils.test.ts
+++ b/src/test/utils.test.ts
@@ -96,6 +96,16 @@ describe("utils — formatUsd", () => {
     assert.equal(formatUsd(0), "$0.00");
     assert.equal(formatUsd(1.005), "$1.00");
   });
+
+  it("keeps sub-cent spend visible", () => {
+    assert.equal(formatUsd(0.005), "$0.0050");
+    assert.equal(formatUsd(0.0002), "$0.0002");
+  });
+
+  it("compacts large amounts", () => {
+    assert.equal(formatUsd(1_500), "$1.50K");
+    assert.equal(formatUsd(1_234_567), "$1.23M");
+  });
 });
 
 describe("utils — formatTokenCount", () => {
@@ -106,6 +116,17 @@ describe("utils — formatTokenCount", () => {
     assert.equal(formatTokenCount(12_345), "12k");
     assert.equal(formatTokenCount(1_234_567), "1.2M");
   });
+
+  it("handles billions and trillions", () => {
+    assert.equal(formatTokenCount(1_234_567_890), "1.2B");
+    assert.equal(formatTokenCount(2_000_000_000_000), "2.0T");
+  });
+
+  it("escalates units when rounding would overflow", () => {
+    assert.equal(formatTokenCount(999_500), "1.0M");
+    assert.equal(formatTokenCount(999_999_500), "1.0B");
+    assert.equal(formatTokenCount(999_999_999_500), "1.0T");
+  });
 });
 
 describe("utils — formatRelativeTime", () => {
diff --git a/src/usage.ts b/src/usage.ts
index d8cb78e..20fe259 100644
--- a/src/usage.ts
+++ b/src/usage.ts
@@ -74,13 +74,13 @@ export function formatUsageStatusBarTooltip(providerDisplayName: string, modelId
   const lines = [
     `Provider: ${providerDisplayName}`,
     `Model: ${modelId}`,
-    `Prompt: ${String(normalized.promptTokens ?? "n/a")} tokens`,
-    `Output: ${String(normalized.completionTokens ?? "n/a")} tokens`,
-    `Total: ${String(normalized.totalTokens ?? "n/a")} tokens`,
+    `Prompt: ${formatTokenCount(normalized.promptTokens ?? 0)} tokens`,
+    `Output: ${formatTokenCount(normalized.completionTokens ?? 0)} tokens`,
+    `Total: ${formatTokenCount(normalized.totalTokens ?? 0)} tokens`,
   ];
 
   if (normalized.cachedTokens !== undefined) {
-    lines.push(`Cached input: ${String(normalized.cachedTokens)} tokens`);
+    lines.push(`Cached input: ${formatTokenCount(normalized.cachedTokens)} tokens`);
   }
 
   const ratio = formatCacheHitRatio(normalized);
diff --git a/src/utils.ts b/src/utils.ts
index 2b245e8..4efde21 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -58,18 +58,37 @@ export function parseJsonSafe(text: string): unknown {
 
 // ─── Formatting helpers ──────────────────────────────────────────────────────
 
-/** `$12.30`-style fixed two-decimal currency. */
+/**
+ * Currency for display: `$1.23M` / `$1.50K` for large amounts, `$12.30`
+ * normally, and `$0.0004`-style precision for sub-cent spend so tiny usage
+ * never collapses to `$0.00`.
+ */
 export function formatUsd(value: number): string {
-  return `$${value.toFixed(2)}`;
+  const abs = Math.abs(value);
+  if (abs >= 1_000_000) return `$${(value / 1_000_000).toFixed(2)}M`;
+  if (abs >= 1_000) return `$${(value / 1_000).toFixed(2)}K`;
+  if (abs >= 0.01 || value === 0) return `$${value.toFixed(2)}`;
+  return `$${value.toFixed(4)}`;
 }
 
 /**
- * Compact human token count: 1.2M / 12k / 1.2k / raw number.
+ * Compact human token count: 1.2T / 1.2B / 1.2M / 12k / 1.2k / raw number.
  * Rounds at >= 10k for a shorter status-bar label.
  */
 export function formatTokenCount(value: number): string {
-  if (value >= 1_000_000) return `${(value / 1_000_000).toFixed(1)}M`;
-  if (value >= 10_000) return `${Math.round(value / 1_000)}k`;
+  if (value >= 1_000_000_000_000) return `${(value / 1_000_000_000_000).toFixed(1)}T`;
+  if (value >= 1_000_000_000) {
+    const v = Math.round((value / 1_000_000_000) * 10) / 10;
+    return v >= 1_000 ? `${(v / 1_000).toFixed(1)}T` : `${v}B`;
+  }
+  if (value >= 1_000_000) {
+    const v = Math.round((value / 1_000_000) * 10) / 10;
+    return v >= 1_000 ? `${(v / 1_000).toFixed(1)}B` : `${v}M`;
+  }
+  if (value >= 10_000) {
+    const k = Math.round(value / 1_000);
+    return k >= 1_000 ? `${(k / 1_000).toFixed(1)}M` : `${k}k`;
+  }
   if (value >= 1_000) return `${(value / 1_000).toFixed(1)}k`;
   return String(value);
 }

From 075d49a5c5564eb8d0450bf181d7560ff3958d46 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 11:09:10 +0500
Subject: [PATCH 27/43] feat(usage): compact request counts (1.7k) everywhere

Request counts now use the same K/M/B/T compact formatter as tokens
(formatCount, shared with formatTokenCount), so the tooltip card, usage
panel and quick-pick never print raw numbers like 1715 again.
---
 CHANGELOG.md           |  2 +-
 src/extension.ts       | 18 ++++++++++++++----
 src/goUsageTracker.ts  |  6 +++---
 src/test/utils.test.ts |  8 ++++++++
 src/utils.ts           | 10 +++++++---
 5 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8bac57..9e454aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
-- **`[Usage]` Compact number formatting everywhere.** Token counts render as `1.2T` / `1.2B` / `1.2M` / `12k` (with correct unit escalation at rounding boundaries — no more `1000.0M`), and dollars as `$1.23M` / `$1.50K` / `$12.30` with sub-cent precision (`$0.0004`) so tiny spend never collapses to `$0.00`. Applied to the status-bar tooltip, tooltip card, quick-pick and usage panel.
+- **`[Usage]` Compact number formatting everywhere.** Token AND request counts render as `1.2T` / `1.2B` / `1.2M` / `12k` (with correct unit escalation at rounding boundaries — no more `1000.0M`), and dollars as `$1.23M` / `$1.50K` / `$12.30` with sub-cent precision (`$0.0004`) so tiny spend never collapses to `$0.00`. Applied to the status-bar tooltip, tooltip card, quick-pick and usage panel.
 
 - **`[Usage]` Today/Yesterday now merge the OpenCode CLI history with extension-tracked usage.** The CLI database (`~/.local/share/opencode/opencode.db`) stores per-message `cost` + `tokens.{input,output,reasoning,cache}` + `path.cwd` + timestamps, so users who also run OpenCode in the terminal get their real combined daily totals (terminal + VS Code) instead of VS Code-only estimates. Configurable via `opencodego.usageTodayYesterdaySource` (`auto` / `cli` / `extension`).
 - **`[Usage]` New "Codebase" row replaces the old "Session (est)" estimate.** Shows all-time usage for the CURRENT workspace (matched per-directory from the CLI history `path.cwd`), forever by default (`opencodego.usageCodebaseWindowDays`, 0 = all history). Toggle with `opencodego.usageCodebaseRow`.
diff --git a/src/extension.ts b/src/extension.ts
index 096d529..c31d204 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -126,7 +126,17 @@ import {
   SETTING_USAGE_TODAY_YESTERDAY_SOURCE,
   type UsageTodayYesterdaySource,
 } from "./config";
-import { escapeHtml, formatRelativeTime, formatTokenCount, formatUsd, getErrorMessage, isRecord, sleep, toFiniteNumber } from "./utils";
+import {
+  escapeHtml,
+  formatCount,
+  formatRelativeTime,
+  formatTokenCount,
+  formatUsd,
+  getErrorMessage,
+  isRecord,
+  sleep,
+  toFiniteNumber,
+} from "./utils";
 import { parseToolInput as parseToolInputShared } from "./toolCallAccumulator";
 import { isFreeModel } from "./metadata";
 
@@ -828,7 +838,7 @@ export function activate(context: vscode.ExtensionContext) {
         const codebaseItem: vscode.QuickPickItem = {
           label: "$(repo) Codebase (all-time)",
           description: formatUsd(summary.codebase.cost),
-          detail: `${formatTokenCount(summary.codebase.tokens)} tokens · ${String(summary.codebase.requests)} requests`,
+          detail: `${formatTokenCount(summary.codebase.tokens)} tokens · ${formatCount(summary.codebase.requests)} requests`,
           alwaysShow: true,
         };
         const dailyIdx = items.findIndex((i) => i.kind === vscode.QuickPickItemKind.Separator && i.label === "Daily Summary");
@@ -1501,7 +1511,7 @@ function usageCardStatsHtml(label: string, day: _UsageSummary["today"]): string
   return [
     '<div class="stats">',
     `<div class="stat"><div class="label">${escapeHtml(label)}</div><div class="value">${escapeHtml(formatUsd(day.cost))}</div></div>`,
-    `<div class="stat"><div class="label">Requests</div><div class="value">${day.requests}</div></div>`,
+    `<div class="stat"><div class="label">Requests</div><div class="value">${formatCount(day.requests)}</div></div>`,
     `<div class="stat"><div class="label">Tokens</div><div class="value">${escapeHtml(formatTokenCount(day.tokens))}</div></div>`,
     "</div>",
   ].join("");
@@ -1680,7 +1690,7 @@ function buildUsageTooltipSvg(s: _UsageSummary, profileLabel?: string): string {
       text(label, padX, y, 13, 400, muted),
       text(formatUsd(cost), 120, y, 13, 700),
       text("Requests:", 190, y, 13, 400, muted),
-      text(String(requests), 262, y, 13, 700),
+      text(formatCount(requests), 262, y, 13, 700),
       text("Tokens:", 305, y, 13, 400, muted),
       text(formatTokenCount(tokenCount), 385, y, 13, 700),
     ].join("");
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index bbe1e39..1285aa2 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -20,7 +20,7 @@ import {
   GO_MAX_SESSIONS,
   type UsageTodayYesterdaySource,
 } from "./config";
-import { formatTokenCount, formatUsd, formatRelativeTime } from "./utils";
+import { formatCount, formatTokenCount, formatUsd, formatRelativeTime } from "./utils";
 
 export { GO_LIMITS } from "./config";
 
@@ -1215,7 +1215,7 @@ export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer
   items.push({
     label: `$(history) Today`,
     description: formatUsd(summary.today.cost),
-    detail: `${formatTokenCount(summary.today.tokens)} tokens · ${String(summary.today.requests)} requests`,
+    detail: `${formatTokenCount(summary.today.tokens)} tokens · ${formatCount(summary.today.requests)} requests`,
     alwaysShow: true,
   });
 
@@ -1223,7 +1223,7 @@ export function buildUsageQuickPickItems(summary: UsageSummary, syncedFromServer
     items.push({
       label: `$(history) Yesterday`,
       description: formatUsd(summary.yesterday.cost),
-      detail: `${formatTokenCount(summary.yesterday.tokens)} tokens · ${String(summary.yesterday.requests)} requests`,
+      detail: `${formatTokenCount(summary.yesterday.tokens)} tokens · ${formatCount(summary.yesterday.requests)} requests`,
       alwaysShow: true,
     });
   }
diff --git a/src/test/utils.test.ts b/src/test/utils.test.ts
index d49cd56..44eb833 100644
--- a/src/test/utils.test.ts
+++ b/src/test/utils.test.ts
@@ -4,6 +4,7 @@ import {
   compactErrorCode,
   escapeHtml,
   firstString,
+  formatCount,
   formatRelativeTime,
   formatTokenCount,
   formatUsd,
@@ -122,6 +123,13 @@ describe("utils — formatTokenCount", () => {
     assert.equal(formatTokenCount(2_000_000_000_000), "2.0T");
   });
 
+  it("formatCount compacts request-style counts", () => {
+    assert.equal(formatCount(999), "999");
+    assert.equal(formatCount(1_715), "1.7k");
+    assert.equal(formatCount(12_345), "12k");
+    assert.equal(formatCount(1_234_567), "1.2M");
+  });
+
   it("escalates units when rounding would overflow", () => {
     assert.equal(formatTokenCount(999_500), "1.0M");
     assert.equal(formatTokenCount(999_999_500), "1.0B");
diff --git a/src/utils.ts b/src/utils.ts
index 4efde21..d626233 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -72,10 +72,11 @@ export function formatUsd(value: number): string {
 }
 
 /**
- * Compact human token count: 1.2T / 1.2B / 1.2M / 12k / 1.2k / raw number.
- * Rounds at >= 10k for a shorter status-bar label.
+ * Compact human count: 1.2T / 1.2B / 1.2M / 12k / 1.2k / raw number.
+ * Rounds at >= 10k for a shorter label. Used for token counts AND request
+ * counts so no UI ever prints long raw numbers.
  */
-export function formatTokenCount(value: number): string {
+export function formatCount(value: number): string {
   if (value >= 1_000_000_000_000) return `${(value / 1_000_000_000_000).toFixed(1)}T`;
   if (value >= 1_000_000_000) {
     const v = Math.round((value / 1_000_000_000) * 10) / 10;
@@ -93,6 +94,9 @@ export function formatTokenCount(value: number): string {
   return String(value);
 }
 
+/** Compact token count — see {@link formatCount}. */
+export const formatTokenCount = formatCount;
+
 /** Compact relative time ("now", "5m", "3h", "3h 20m", "2d 4h"). */
 export function formatRelativeTime(target: Date, from: Date = new Date()): string {
   const diffMs = target.getTime() - from.getTime();

From 63a18a083ceccf39a42a5142504aa8be714ebc71 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 11:15:00 +0500
Subject: [PATCH 28/43] perf(usage): instant startup + cached CLI history read
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- The last successful server-usage snapshot is persisted to globalState
  (opencodego.serverUsage.v1, namespaced per profile) and restored on
  construction, so the status bar/tooltip render real meters immediately at
  startup instead of 0s until the TTL-guarded refetch lands (background
  refresh still runs right away).
- The CLI database read (a blocking sqlite3 spawn over a multi-GB file) is
  memoized with a 3s TTL, so bursts of UI refreshes — status bar, tooltip,
  panel, quick-pick — pay the query cost once per window instead of on every
  getSummary() call.
- Tests: snapshot restore, per-profile namespacing (261 tests).
---
 CHANGELOG.md                    |  2 ++
 src/config.ts                   |  2 ++
 src/goUsageTracker.ts           | 26 ++++++++++++++++++++
 src/test/goUsageTracker.test.ts | 42 +++++++++++++++++++++++++++++++--
 4 files changed, 70 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e454aa..494551d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
+- **`[Usage]` Instant startup + no more slow usage reads.** The last successful server-usage snapshot is now persisted (`opencodego.serverUsage.v1`) and restored on window start, so the status bar / tooltip render real meters immediately instead of 0s until the network refetch lands (the TTL-guarded refresh still runs in the background). The CLI database read — a blocking `sqlite3` call over a multi-GB file — is memoized for 3 seconds, so a burst of UI refreshes (status bar + tooltip + panel) pays the query cost once.
+
 - **`[Usage]` Compact number formatting everywhere.** Token AND request counts render as `1.2T` / `1.2B` / `1.2M` / `12k` (with correct unit escalation at rounding boundaries — no more `1000.0M`), and dollars as `$1.23M` / `$1.50K` / `$12.30` with sub-cent precision (`$0.0004`) so tiny spend never collapses to `$0.00`. Applied to the status-bar tooltip, tooltip card, quick-pick and usage panel.
 
 - **`[Usage]` Today/Yesterday now merge the OpenCode CLI history with extension-tracked usage.** The CLI database (`~/.local/share/opencode/opencode.db`) stores per-message `cost` + `tokens.{input,output,reasoning,cache}` + `path.cwd` + timestamps, so users who also run OpenCode in the terminal get their real combined daily totals (terminal + VS Code) instead of VS Code-only estimates. Configurable via `opencodego.usageTodayYesterdaySource` (`auto` / `cli` / `extension`).
diff --git a/src/config.ts b/src/config.ts
index 6f3b862..091f6d2 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -148,6 +148,8 @@ export const GO_USAGE_API_URL = "https://opencode.ai/zen/go/v1/usage";
 /** How long a successful server-usage snapshot is reused before refetching. */
 export const GO_USAGE_SYNC_TTL_MS = 60_000;
 export const GO_USAGE_LOG_KEY = "opencodego.usageLog.v1";
+/** Persisted copy of the last successful server-usage snapshot (startup fast-path). */
+export const GO_SERVER_USAGE_KEY = "opencodego.serverUsage.v1";
 export const GO_USAGE_BASELINE_KEY = "opencodego.usageBaseline.v1";
 export const GO_EVER_TRACKED_KEY = "opencodego.everTracked.v1";
 export const GO_SESSION_COSTS_KEY = "opencodego.sessionCosts.v1";
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index 1285aa2..75eb549 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -18,6 +18,7 @@ import {
   GO_MAX_LOG_ENTRIES,
   GO_SESSION_IDLE_MS,
   GO_MAX_SESSIONS,
+  GO_SERVER_USAGE_KEY,
   type UsageTodayYesterdaySource,
 } from "./config";
 import { formatCount, formatTokenCount, formatUsd, formatRelativeTime } from "./utils";
@@ -377,7 +378,26 @@ export interface UsageDaily {
   tokens: number;
 }
 
+/**
+ * The CLI database can be gigabytes large and spawning `sqlite3` is a
+ * synchronous, blocking call — but the usage UI (status bar, tooltip, panel,
+ * quick-pick) re-reads it on every refresh. Memoize the result for a short
+ * window so a burst of refreshes pays the query cost once.
+ */
+const HISTORY_READ_TTL_MS = 3_000;
+let historyCache: { rows: HistoryRow[] | null; fetchedAt: number } | undefined;
+
 function readOpenCodeHistory(): HistoryRow[] | null {
+  const now = Date.now();
+  if (historyCache && now - historyCache.fetchedAt < HISTORY_READ_TTL_MS) {
+    return historyCache.rows;
+  }
+  const rows = readOpenCodeHistoryUncached();
+  historyCache = { rows, fetchedAt: now };
+  return rows;
+}
+
+function readOpenCodeHistoryUncached(): HistoryRow[] | null {
   if (!fs.existsSync(OPENCODE_DB_PATH)) return null;
 
   try {
@@ -449,6 +469,10 @@ export class GoUsageTracker {
     this.log = log;
     this.costResolver = costResolver;
     this.restore();
+    // Fast startup: show the last successful server snapshot immediately
+    // instead of 0s until the TTL-guarded refetch lands. `serverUsageFetchedAt`
+    // stays 0, so the background sync still refreshes right away.
+    this.serverUsage = this.context.globalState.get<GoUsageApiResponse>(this.storageKey(GO_SERVER_USAGE_KEY));
   }
 
   private storageKey(base: string): string {
@@ -683,6 +707,8 @@ export class GoUsageTracker {
       return false;
     }
     this.serverUsage = result.data;
+    // Persist so the next window start can render the meters instantly.
+    void this.context.globalState.update(this.storageKey(GO_SERVER_USAGE_KEY), result.data);
     this.log?.("[go-usage] Server usage synced from /zen/go/v1/usage.");
     return true;
   }
diff --git a/src/test/goUsageTracker.test.ts b/src/test/goUsageTracker.test.ts
index 01dc757..9b84bef 100644
--- a/src/test/goUsageTracker.test.ts
+++ b/src/test/goUsageTracker.test.ts
@@ -6,8 +6,16 @@ import fs from "node:fs";
 import os from "node:os";
 import type { ModelCost } from "../metadata.js";
 import type { TransportRequestSummary } from "../streaming.js";
-import { GO_USAGE_LOG_KEY, GO_USAGE_BASELINE_KEY, GO_SESSION_COSTS_KEY, GO_SESSION_IDLE_MS, GO_MAX_SESSIONS } from "../config.js";
-import type { HistoryRow, UsageDaily, UsageLogEntry } from "../goUsageTracker.js";
+import {
+  GO_USAGE_LOG_KEY,
+  GO_USAGE_BASELINE_KEY,
+  GO_SESSION_COSTS_KEY,
+  GO_SESSION_IDLE_MS,
+  GO_MAX_SESSIONS,
+  GO_SERVER_USAGE_KEY,
+} from "../config.js";
+import type { GoUsageApiResponse } from "../goUsageSync";
+import type { HistoryRow, UsageDaily, UsageLogEntry, UsageSummary } from "../goUsageTracker.js";
 
 // ── Types (populated by dynamic import in before()) ────────────────────────
 
@@ -38,6 +46,8 @@ interface GoUsageTrackerInstance {
   record(summary: TransportRequestSummary, externalCost?: ModelCost): void;
   getCurrentSessionCost(): SessionSummary | undefined;
   getRecentSessionCosts(limit?: number): SessionSummary[];
+  getSummary(): UsageSummary;
+  readonly hasServerUsage: boolean;
   clear(): void;
 }
 
@@ -45,6 +55,7 @@ type GoUsageTrackerConstructor = new (
   context: unknown,
   log?: (msg: string) => void,
   costResolver?: (modelId: string) => ModelCost | undefined,
+  storageKeySuffix?: string,
 ) => GoUsageTrackerInstance;
 
 let GoUsageTracker: GoUsageTrackerConstructor;
@@ -686,3 +697,30 @@ describe("startOfLocalDay", () => {
     assert.ok(localMidnight <= now.getTime());
   });
 });
+
+describe("server usage snapshot persistence", () => {
+  const snapshot: GoUsageApiResponse = {
+    usage: {
+      rolling: { status: "ok", percent: 27, resetsAt: "2026-08-13T14:32:10.000Z" },
+      weekly: { status: "ok", percent: 62, resetsAt: "2026-08-17T00:00:00.000Z" },
+      monthly: { status: "rate-limited", percent: 100, resetsAt: "2026-08-31T00:00:00.000Z" },
+    },
+  };
+
+  it("restores the persisted snapshot on construction (instant startup)", () => {
+    const tracker = new GoUsageTracker(createMockContext({ [GO_SERVER_USAGE_KEY]: snapshot }));
+    assert.equal(tracker.hasServerUsage, true, "snapshot must be available before any network fetch");
+    const summary = tracker.getSummary();
+    assert.equal(summary.session.percent, 27);
+    assert.equal(summary.weekly.percent, 62);
+    assert.equal(summary.monthly.percent, 100);
+  });
+
+  it("uses namespaced storage for per-profile trackers", () => {
+    const tracker = new GoUsageTracker(createMockContext(), undefined, undefined, "fp-1234");
+    const summary = tracker.getSummary();
+    // No snapshot stored for this profile yet → meters fall back to local estimates.
+    assert.equal(tracker.hasServerUsage, false);
+    assert.ok(summary.weekly.limit > 0);
+  });
+});

From 5af40cea4e9cf311a72c82276951a56de8c48d80 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 11:26:21 +0500
Subject: [PATCH 29/43] feat(usage): realtime status bar, tooltip and panel
 updates

- Background refresh loop (opencodego.usageRefreshIntervalSeconds, default
  60s, min 5s) re-renders the status bar and usage panel so terminal-side
  CLI usage, server meters and midnight day rollovers show up without
  waiting for the next chat request. Server refetch stays TTL-guarded (60s);
  shorter intervals refresh the local CLI-history rows.
- Changing any usage-view setting (source, codebase row/window, day
  boundary, rolling meter, refresh interval) repaints the UI immediately.
- The interval setting itself is re-read on every tick, so it applies live.
---
 CHANGELOG.md     |  2 ++
 package.json     |  7 +++++++
 src/config.ts    |  3 +++
 src/extension.ts | 51 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 63 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 494551d..526e72b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
+- **`[Usage]` Realtime updates.** The status bar, tooltip and usage panel now refresh on a configurable background cadence (`opencodego.usageRefreshIntervalSeconds`, default 60s, min 5s), so terminal-side OpenCode CLI usage, server meters and midnight day rollovers appear without waiting for the next chat request. Changing any usage-view setting repaints the UI immediately, and the refresh interval itself applies live on the next tick.
+
 - **`[Usage]` Instant startup + no more slow usage reads.** The last successful server-usage snapshot is now persisted (`opencodego.serverUsage.v1`) and restored on window start, so the status bar / tooltip render real meters immediately instead of 0s until the network refetch lands (the TTL-guarded refresh still runs in the background). The CLI database read — a blocking `sqlite3` call over a multi-GB file — is memoized for 3 seconds, so a burst of UI refreshes (status bar + tooltip + panel) pays the query cost once.
 
 - **`[Usage]` Compact number formatting everywhere.** Token AND request counts render as `1.2T` / `1.2B` / `1.2M` / `12k` (with correct unit escalation at rounding boundaries — no more `1000.0M`), and dollars as `$1.23M` / `$1.50K` / `$12.30` with sub-cent precision (`$0.0004`) so tiny spend never collapses to `$0.00`. Applied to the status-bar tooltip, tooltip card, quick-pick and usage panel.
diff --git a/package.json b/package.json
index aea960a..0e6e0b9 100644
--- a/package.json
+++ b/package.json
@@ -170,6 +170,13 @@
           "default": true,
           "description": "Show the server-accurate 5-hour rolling session meter in the usage tooltip, quick-pick and panel. Weekly and monthly meters are always shown."
         },
+        "opencodego.usageRefreshIntervalSeconds": {
+          "type": "number",
+          "default": 60,
+          "minimum": 5,
+          "maximum": 3600,
+          "description": "How often the usage status bar and panel refresh in the background (seconds). Terminal-side (OpenCode CLI) usage and server meters are re-read on this cadence; values below the 60s server-sync TTL only refresh the local CLI history rows."
+        },
         "opencodego.usageDayBoundary": {
           "type": "string",
           "enum": [
diff --git a/src/config.ts b/src/config.ts
index 091f6d2..ffc4ee1 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -181,6 +181,9 @@ export const DEFAULT_USAGE_ROLLING_SESSION_METER = true;
 /** Day boundary used for the Today/Yesterday rows. */
 export const SETTING_USAGE_DAY_BOUNDARY = "usageDayBoundary";
 export const DEFAULT_USAGE_DAY_BOUNDARY = "utc";
+/** How often the usage status bar / panel refresh in the background (seconds). */
+export const SETTING_USAGE_REFRESH_INTERVAL_SECONDS = "usageRefreshIntervalSeconds";
+export const DEFAULT_USAGE_REFRESH_INTERVAL_SECONDS = 60;
 
 // ─── Usage profiles (issue #63) ──────────────────────────────────────────────
 
diff --git a/src/extension.ts b/src/extension.ts
index c31d204..7ac276c 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -117,11 +117,13 @@ import {
   DEFAULT_USAGE_CODEBASE_ROW,
   DEFAULT_USAGE_CODEBASE_WINDOW_DAYS,
   DEFAULT_USAGE_DAY_BOUNDARY,
+  DEFAULT_USAGE_REFRESH_INTERVAL_SECONDS,
   DEFAULT_USAGE_ROLLING_SESSION_METER,
   DEFAULT_USAGE_TODAY_YESTERDAY_SOURCE,
   SETTING_USAGE_CODEBASE_ROW,
   SETTING_USAGE_CODEBASE_WINDOW_DAYS,
   SETTING_USAGE_DAY_BOUNDARY,
+  SETTING_USAGE_REFRESH_INTERVAL_SECONDS,
   SETTING_USAGE_ROLLING_SESSION_METER,
   SETTING_USAGE_TODAY_YESTERDAY_SOURCE,
   type UsageTodayYesterdaySource,
@@ -221,6 +223,47 @@ function usageCodebaseRowVisible(): boolean {
   return vscode.workspace.getConfiguration(CONFIG_SECTION).get<boolean>(SETTING_USAGE_CODEBASE_ROW, DEFAULT_USAGE_CODEBASE_ROW);
 }
 
+/** Every usage-view setting — a change to any of these repaints immediately. */
+const USAGE_DISPLAY_SETTING_KEYS = [
+  SETTING_USAGE_TODAY_YESTERDAY_SOURCE,
+  SETTING_USAGE_CODEBASE_ROW,
+  SETTING_USAGE_CODEBASE_WINDOW_DAYS,
+  SETTING_USAGE_DAY_BOUNDARY,
+  SETTING_USAGE_ROLLING_SESSION_METER,
+  SETTING_USAGE_REFRESH_INTERVAL_SECONDS,
+];
+
+/**
+ * Realtime usage updates: re-render the status bar (and webview) on a
+ * configurable cadence so terminal-side OpenCode CLI usage, server meters and
+ * day rollovers show up without waiting for the next chat request. The
+ * interval re-reads the setting on every tick, so changes apply live.
+ */
+function startUsageRefreshLoop(context: vscode.ExtensionContext): void {
+  let timer: ReturnType<typeof setTimeout> | undefined;
+  const schedule = (): void => {
+    timer = setTimeout(() => {
+      refreshGoUsageStatusBar();
+      schedule();
+    }, usageRefreshIntervalSeconds() * 1000);
+  };
+  schedule();
+  context.subscriptions.push({
+    dispose: () => {
+      if (timer) clearTimeout(timer);
+    },
+  });
+}
+
+function usageRefreshIntervalSeconds(): number {
+  return Math.max(
+    5,
+    vscode.workspace
+      .getConfiguration(CONFIG_SECTION)
+      .get<number>(SETTING_USAGE_REFRESH_INTERVAL_SECONDS, DEFAULT_USAGE_REFRESH_INTERVAL_SECONDS),
+  );
+}
+
 /** Look up (or create) the GoUsageTracker for a given key fingerprint. */
 function getOrCreateTracker(fingerprint: string): GoUsageTracker {
   // The singleton tracker does not have a storage suffix
@@ -1014,9 +1057,17 @@ export function activate(context: vscode.ExtensionContext) {
           void revertAgentsWindowSupport(context);
         }
       }
+      // Any usage-display setting change repaints the status bar / panel
+      // immediately (no waiting for the next request or refresh tick).
+      if (USAGE_DISPLAY_SETTING_KEYS.some((key) => event.affectsConfiguration(`${CONFIG_SECTION}.${key}`))) {
+        refreshGoUsageStatusBar();
+        updateWebviewContent();
+      }
     }),
   );
 
+  startUsageRefreshLoop(context);
+
   void warmModelPickerMetadata();
 
   // Experimental inline code suggestions (issue #49). Opt-in via

From 1e5b33eb8dc04eef80cbe4dea65112e0dcf16952 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 11:43:00 +0500
Subject: [PATCH 30/43] feat(usage): full-page usage dashboard with charts and
 shortcut
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The usage webview is now a complete dashboard adapted from the reference
design: animated ring meters for Session/Weekly/Monthly, stat chips for
Today/Yesterday/Total spend, and a chart area with Spend/Requests/Tokens
tabs (line charts with cursor-follow tooltips) plus a By-model tab showing
horizontal bars stacked by day (hover a segment for the model · day ·
spend/tokens/requests breakdown). Data comes from a new tracker method
getUsageSeries() (per-day + per-model-per-day buckets over the CLI history
and extension entries, pure buildUsageSeries unit-tested).

- All-time workspace row renamed to 'Total spend' everywhere; 'Top model'
  and 'Models used' chips removed.
- New setting opencodego.usageChartDays (default 14) controls the window.
- New keybinding Ctrl+Shift+Alt+U (Cmd on macOS) opens the panel.
- Webview enables scripts with a strict CSP; all data JSON-escaped.
---
 CHANGELOG.md                    |   2 +
 package.json                    |  15 +
 src/config.ts                   |   3 +
 src/extension.ts                | 560 +++++++++++++++++++++++++-------
 src/goUsageTracker.ts           | 106 +++++-
 src/test/goUsageTracker.test.ts | 101 ++++++
 6 files changed, 662 insertions(+), 125 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 526e72b..a1a332c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
+- **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (horizontal bars stacked per day — hover any segment for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Open the panel instantly with `Ctrl+Shift+Alt+U` (`Cmd+Shift+Alt+U` on macOS) or the existing "Open full usage panel" quick-pick action.
+
 - **`[Usage]` Realtime updates.** The status bar, tooltip and usage panel now refresh on a configurable background cadence (`opencodego.usageRefreshIntervalSeconds`, default 60s, min 5s), so terminal-side OpenCode CLI usage, server meters and midnight day rollovers appear without waiting for the next chat request. Changing any usage-view setting repaints the UI immediately, and the refresh interval itself applies live on the next tick.
 
 - **`[Usage]` Instant startup + no more slow usage reads.** The last successful server-usage snapshot is now persisted (`opencodego.serverUsage.v1`) and restored on window start, so the status bar / tooltip render real meters immediately instead of 0s until the network refetch lands (the TTL-guarded refresh still runs in the background). The CLI database read — a blocking `sqlite3` call over a multi-GB file — is memoized for 3 seconds, so a burst of UI refreshes (status bar + tooltip + panel) pays the query cost once.
diff --git a/package.json b/package.json
index 0e6e0b9..6d4436f 100644
--- a/package.json
+++ b/package.json
@@ -61,6 +61,14 @@
   ],
   "main": "./out/extension.js",
   "contributes": {
+    "keybindings": [
+      {
+        "command": "opencodego.showUsageDetails",
+        "key": "ctrl+shift+alt+u",
+        "mac": "cmd+shift+alt+u",
+        "when": "!inQuickOpen"
+      }
+    ],
     "commands": [
       {
         "command": "opencodego.manage",
@@ -177,6 +185,13 @@
           "maximum": 3600,
           "description": "How often the usage status bar and panel refresh in the background (seconds). Terminal-side (OpenCode CLI) usage and server meters are re-read on this cadence; values below the 60s server-sync TTL only refresh the local CLI history rows."
         },
+        "opencodego.usageChartDays": {
+          "type": "number",
+          "default": 14,
+          "minimum": 7,
+          "maximum": 90,
+          "description": "How many days the usage panel charts cover (daily spend / requests / tokens and the per-model breakdown)."
+        },
         "opencodego.usageDayBoundary": {
           "type": "string",
           "enum": [
diff --git a/src/config.ts b/src/config.ts
index ffc4ee1..24fad89 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -184,6 +184,9 @@ export const DEFAULT_USAGE_DAY_BOUNDARY = "utc";
 /** How often the usage status bar / panel refresh in the background (seconds). */
 export const SETTING_USAGE_REFRESH_INTERVAL_SECONDS = "usageRefreshIntervalSeconds";
 export const DEFAULT_USAGE_REFRESH_INTERVAL_SECONDS = 60;
+/** How many days the usage panel charts cover. */
+export const SETTING_USAGE_CHART_DAYS = "usageChartDays";
+export const DEFAULT_USAGE_CHART_DAYS = 14;
 
 // ─── Usage profiles (issue #63) ──────────────────────────────────────────────
 
diff --git a/src/extension.ts b/src/extension.ts
index 7ac276c..3332d47 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -118,12 +118,14 @@ import {
   DEFAULT_USAGE_CODEBASE_WINDOW_DAYS,
   DEFAULT_USAGE_DAY_BOUNDARY,
   DEFAULT_USAGE_REFRESH_INTERVAL_SECONDS,
+  DEFAULT_USAGE_CHART_DAYS,
   DEFAULT_USAGE_ROLLING_SESSION_METER,
   DEFAULT_USAGE_TODAY_YESTERDAY_SOURCE,
   SETTING_USAGE_CODEBASE_ROW,
   SETTING_USAGE_CODEBASE_WINDOW_DAYS,
   SETTING_USAGE_DAY_BOUNDARY,
   SETTING_USAGE_REFRESH_INTERVAL_SECONDS,
+  SETTING_USAGE_CHART_DAYS,
   SETTING_USAGE_ROLLING_SESSION_METER,
   SETTING_USAGE_TODAY_YESTERDAY_SOURCE,
   type UsageTodayYesterdaySource,
@@ -879,7 +881,7 @@ export function activate(context: vscode.ExtensionContext) {
       // history) — replaces the old "Latest Session (est)" estimate row.
       if (usageCodebaseRowVisible()) {
         const codebaseItem: vscode.QuickPickItem = {
-          label: "$(repo) Codebase (all-time)",
+          label: "$(repo) Total spend",
           description: formatUsd(summary.codebase.cost),
           detail: `${formatTokenCount(summary.codebase.tokens)} tokens · ${formatCount(summary.codebase.requests)} requests`,
           alwaysShow: true,
@@ -1400,8 +1402,8 @@ function showUsageWebview(context: vscode.ExtensionContext): void {
     return;
   }
 
-  usageWebviewPanel = vscode.window.createWebviewPanel("opencodego.usageWebview", "OpenCode Usage Summary", vscode.ViewColumn.Beside, {
-    enableScripts: false,
+  usageWebviewPanel = vscode.window.createWebviewPanel("opencodego.usageWebview", "OpenCode Usage", vscode.ViewColumn.Beside, {
+    enableScripts: true,
     retainContextWhenHidden: true,
   });
 
@@ -1416,6 +1418,11 @@ function showUsageWebview(context: vscode.ExtensionContext): void {
   updateWebviewContent();
 }
 
+/** Escape a JSON payload for embedding in an HTML <script> block. */
+function jsonForWebview(value: unknown): string {
+  return JSON.stringify(value).replace(/<\//g, "<\\/");
+}
+
 function updateWebviewContent(): void {
   if (!usageWebviewPanel || !goUsageTracker) return;
   const tracker = activeGoUsageTracker();
@@ -1424,150 +1431,455 @@ function updateWebviewContent(): void {
     return;
   }
   const s = tracker.getSummary();
+  const chartDays = vscode.workspace.getConfiguration(CONFIG_SECTION).get<number>(SETTING_USAGE_CHART_DAYS, DEFAULT_USAGE_CHART_DAYS);
+  const series = tracker.getUsageSeries(chartDays);
   const activeProfile = findProfile(profilesCache, activeProfileFingerprint);
   const profileLabel = activeProfile?.label ?? "OpenCode Go";
+  const showRolling = usageRollingMeterVisible();
+
+  const rings = [
+    ...(showRolling
+      ? [
+          {
+            key: "session",
+            label: "Session (5h)",
+            percent: s.session.percent,
+            spent: s.session.spent,
+            limit: s.session.limit,
+            resetsIn: formatRelativeTime(s.session.resetsAt),
+          },
+        ]
+      : []),
+    {
+      key: "weekly",
+      label: "Weekly",
+      percent: s.weekly.percent,
+      spent: s.weekly.spent,
+      limit: s.weekly.limit,
+      resetsIn: formatRelativeTime(s.weekly.resetsAt),
+    },
+    {
+      key: "monthly",
+      label: "Monthly",
+      percent: s.monthly.percent,
+      spent: s.monthly.spent,
+      limit: s.monthly.limit,
+      resetsIn: formatRelativeTime(s.monthly.resetsAt),
+    },
+  ];
+
+  const data = {
+    profile: profileLabel,
+    rings,
+    stats: {
+      total: { label: "Total spend", cost: s.codebase.cost, tokens: s.codebase.tokens, requests: s.codebase.requests },
+      today: { label: "Today", cost: s.today.cost, tokens: s.today.tokens, requests: s.today.requests },
+      yesterday: { label: "Yesterday", cost: s.yesterday.cost, tokens: s.yesterday.tokens, requests: s.yesterday.requests },
+    },
+    days: series.days,
+    byModel: series.byModel,
+    windowDays: chartDays,
+  };
 
   usageWebviewPanel.webview.html = `
     <!DOCTYPE html>
     <html lang="en">
     <head>
-      <meta charset="UTF-8">
-      <meta name="viewport" content="width=device-width, initial-scale=1.0">
-      <title>OpenCode Usage Summary — ${escapeHtml(profileLabel)}</title>
-      <style>
-        :root {
-          --bg: var(--vscode-editorWidget-background, #252526);
-          --border: var(--vscode-widget-border, #3c3c3c);
-          --text: var(--vscode-foreground, #cccccc);
-          --text-dim: var(--vscode-descriptionForeground, #9d9d9d);
-          --accent: var(--vscode-textLink-foreground, #3794ff);
-          --track: var(--vscode-widget-border, #3c3c3c);
-          --divider: var(--vscode-widget-border, #3c3c3c);
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src 'unsafe-inline'; script-src 'unsafe-inline'; img-src data:;">
+    <title>OpenCode Usage</title>
+    <style>
+      :root{
+        --bg-0: #101216; --bg-1: #161a20; --bg-2: #1b2029; --bg-3: #222936;
+        --line: #242a33; --line-soft: #1b2028;
+        --text-hi: #eef1f5; --text-mid: #9aa4b2; --text-lo: #5b6472;
+        --amber: #e3b341; --teal: #3fdbb0; --coral: #ef7f6b; --blue: #5aa9ff; --violet: #a98ef9;
+        --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
+        --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
+        --s: clamp(10px, 1.6vh, 18px);
+        --radius: clamp(8px, 1vh, 14px);
+      }
+      *{box-sizing:border-box; margin:0; padding:0;}
+      html, body{ height:100%; width:100%; overflow:hidden; background:var(--bg-0); color:var(--text-hi); font-family:var(--sans); -webkit-font-smoothing:antialiased; }
+      body{
+        display:grid; grid-template-rows:auto auto 1fr; grid-template-areas:"topbar" "rings" "main";
+        row-gap: var(--s); height:100vh; padding: var(--s);
+        background:
+          radial-gradient(1100px 500px at 90% -20%, rgba(227,179,65,0.05), transparent 60%),
+          radial-gradient(900px 500px at -10% 0%, rgba(63,219,176,0.04), transparent 55%),
+          var(--bg-0);
+      }
+      ::selection{ background:#7a6427; color:var(--text-hi); }
+      *{ min-width:0; min-height:0; }
+
+      .topbar{ grid-area:topbar; display:flex; align-items:center; gap: var(--s); }
+      .brand{ display:flex; align-items:center; gap: clamp(6px,1vw,10px); min-width:0; }
+      .brand .mark{
+        width: clamp(20px, 2.4vh, 28px); height: clamp(20px, 2.4vh, 28px);
+        border-radius: 7px; background:linear-gradient(135deg, var(--amber), var(--coral));
+        display:flex; align-items:center; justify-content:center;
+        font-family:var(--mono); font-weight:700; font-size: clamp(9px, 1.2vh, 12px);
+        color:#141205; flex:none;
+      }
+      .brand .name{ font-weight:700; font-size: clamp(12px, 1.6vh, 15px); letter-spacing:-0.01em; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
+      .brand .sub{ color:var(--text-lo); font-size: clamp(9px, 1.1vh, 11px); font-family:var(--mono); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
+
+      .rings-row{ grid-area:rings; display:flex; gap: var(--s); }
+      .ring-card{
+        flex:1 1 0; background:var(--bg-1); border:1px solid var(--line-soft); border-radius: var(--radius);
+        padding: var(--s); display:flex; align-items:center; gap: var(--s); overflow:hidden;
+      }
+      .ring-wrap{ position:relative; width: clamp(38px, 6vh, 58px); height: clamp(38px, 6vh, 58px); flex:none; }
+      .ring-wrap svg{ width:100%; height:100%; transform:rotate(-90deg); display:block; }
+      .ring-bg{ fill:none; stroke:var(--bg-3); stroke-width:8; }
+      .ring-fg{ fill:none; stroke-width:8; stroke-linecap:round; transition:stroke-dashoffset 1s cubic-bezier(.4,0,.2,1); }
+      .ring-card.session .ring-fg{ stroke:var(--blue); }
+      .ring-card.weekly .ring-fg{ stroke:var(--amber); }
+      .ring-card.monthly .ring-fg{ stroke:var(--teal); }
+      .ring-pct{ position:absolute; inset:0; display:flex; align-items:center; justify-content:center; font-family:var(--mono); font-weight:700; font-size: clamp(9px, 1.4vh, 13px); }
+      .ring-info{ min-width:0; overflow:hidden; }
+      .ring-info .label{ font-size: clamp(10px, 1.3vh, 12.5px); font-weight:700; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
+      .ring-info .reset{ font-family:var(--mono); font-size: clamp(8.5px, 1vh, 10.5px); color:var(--text-lo); margin-top:2px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
+      .ring-info .amounts{ font-family:var(--mono); font-size: clamp(9.5px, 1.2vh, 12px); color:var(--text-mid); margin-top: clamp(3px,0.5vh,6px); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
+      .ring-info .amounts b{ color:var(--text-hi); font-weight:700; }
+
+      .main-panel{
+        grid-area:main; background:var(--bg-1); border:1px solid var(--line-soft); border-radius: var(--radius);
+        padding: var(--s); display:flex; flex-direction:column; gap: var(--s); overflow:hidden; position:relative;
+      }
+      .panel-top{ display:flex; align-items:center; justify-content:space-between; gap: var(--s); flex:none; flex-wrap:nowrap; }
+      .tabs{ display:flex; gap: calc(var(--s)/3); background:var(--bg-2); border:1px solid var(--line-soft); border-radius: calc(var(--radius) - 2px); padding: calc(var(--s)/5); flex:none; }
+      .tab-btn{
+        font-family:var(--sans); font-weight:600; font-size: clamp(9.5px, 1.1vh, 11.5px);
+        padding: calc(var(--s)/2.4) calc(var(--s)*0.85); border-radius: calc(var(--radius) - 4px);
+        border:none; background:transparent; color:var(--text-mid); cursor:pointer; white-space:nowrap;
+        transition: background .15s ease, color .15s ease;
+      }
+      .tab-btn:hover{ color:var(--text-hi); }
+      .tab-btn.active{ background:var(--bg-3); color:var(--text-hi); }
+      .tab-btn .sw{ display:inline-block; width:7px; height:7px; border-radius:2px; margin-right:6px; opacity:.55; }
+      .tab-btn.active .sw{ opacity:1; }
+
+      .stat-chips{ display:flex; gap: var(--s); flex:none; }
+      .stat-chip{ text-align:right; }
+      .stat-chip .k{ font-size: clamp(8.5px, 1vh, 10px); color:var(--text-lo); text-transform:uppercase; letter-spacing:.05em; white-space:nowrap; }
+      .stat-chip .v{ font-family:var(--mono); font-weight:700; font-size: clamp(12px, 1.5vh, 15px); color:var(--text-hi); white-space:nowrap; margin-top:2px; }
+
+      .chart-box{ position:relative; flex:1; min-height:0; }
+      .chart-box svg{ width:100%; height:100%; display:block; overflow:visible; }
+      .chart-box text{ font-family:var(--mono); }
+
+      /* cursor-follow tooltip */
+      .ttip{
+        position:absolute; pointer-events:none; z-index:5; display:none;
+        background:var(--bg-3); border:1px solid var(--line); border-radius:6px;
+        padding:6px 9px; font-family:var(--mono); font-size:11px; color:var(--text-hi);
+        white-space:nowrap; box-shadow:0 4px 14px rgba(0,0,0,.35);
+      }
+      .ttip .t-line{ color:var(--text-lo); margin-right:6px; }
+      .ttip b{ color:var(--text-hi); }
+      .ttip .t-sub{ color:var(--text-mid); font-size:10px; margin-top:2px; }
+
+      .foot{ display:flex; gap: var(--s); flex:none; align-items:center; }
+      .foot a{ color:var(--text-mid); font-size: clamp(9.5px, 1.1vh, 11px); text-decoration:none; cursor:pointer; }
+      .foot a:hover{ color:var(--text-hi); text-decoration:underline; }
+      .foot .spacer{ flex:1; }
+
+      @media (max-width: 620px){
+        .rings-row{ flex-wrap:wrap; }
+        .ring-card{ flex:1 1 100%; }
+        .panel-top{ flex-wrap:wrap; }
+        .stat-chips{ display:none; }
+        .brand .sub{ display:none; }
+      }
+      @media (prefers-reduced-motion: reduce){ *{ transition:none !important; animation:none !important; } }
+    </style>
+    </head>
+    <body>
+      <div class="topbar">
+        <div class="brand">
+          <div class="mark">OC</div>
+          <div class="name">${escapeHtml(profileLabel)} — Usage</div>
+          <div class="sub">opencode-copilot-chat · last ${String(chartDays)} days</div>
+        </div>
+      </div>
+
+      <div class="rings-row" id="rings"></div>
+
+      <div class="main-panel">
+        <div class="panel-top">
+          <div class="tabs" id="tabs">
+            <button class="tab-btn active" data-metric="spend"><span class="sw" style="background:var(--amber)"></span>Spend</button>
+            <button class="tab-btn" data-metric="requests"><span class="sw" style="background:var(--blue)"></span>Requests</button>
+            <button class="tab-btn" data-metric="tokens"><span class="sw" style="background:var(--teal)"></span>Tokens</button>
+            <button class="tab-btn" data-metric="models"><span class="sw" style="background:var(--coral)"></span>By model</button>
+          </div>
+          <div class="stat-chips" id="statChips"></div>
+        </div>
+        <div class="chart-box" id="chartBox">
+          <svg id="chartSvg" xmlns="http://www.w3.org/2000/svg"></svg>
+          <div class="ttip" id="ttip"></div>
+        </div>
+        <div class="foot">
+          <a href="command:opencodego.setUsageTargets">Set spent targets</a>
+          ${nonLegacyCount(profilesCache) > 0 ? '<a href="command:opencodego.renameActiveProfile">Rename profile</a>' : ""}
+          <span class="spacer"></span>
+          <a href="command:opencodego.setUsageTargets">Auto-refreshes every ${String(usageRefreshIntervalSeconds())}s</a>
+        </div>
+      </div>
+
+      <script type="application/json" id="usage-data">${jsonForWebview(data)}</script>
+      <script>
+      (function () {
+        'use strict';
+        var DATA = JSON.parse(document.getElementById('usage-data').textContent);
+        var MODEL_COLORS = ['#e3b341','#5aa9ff','#3fdbb0','#ef7f6b','#a98ef9','#7fd1a8'];
+        var svgNS = 'http://www.w3.org/2000/svg';
+        var svg = document.getElementById('chartSvg');
+        var box = document.getElementById('chartBox');
+        var chips = document.getElementById('statChips');
+        var ttip = document.getElementById('ttip');
+        var current = 'spend';
+
+        function el(tag, attrs, text) {
+          var n = document.createElementNS(svgNS, tag);
+          for (var k in attrs) n.setAttribute(k, attrs[k]);
+          if (text !== undefined) n.textContent = text;
+          return n;
         }
-        * { box-sizing: border-box; }
-        body {
-          margin: 0;
-          height: 100vh;
-          background: var(--vscode-editor-background, #1e1e1e);
-          display: flex;
-          align-items: center;
-          justify-content: center;
-          padding: 16px;
-          font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Ubuntu, sans-serif;
+        function clear() { while (svg.firstChild) svg.removeChild(svg.firstChild); }
+        function fmtUsd(v) { return v >= 1000 ? '$' + (v/1000).toFixed(2) + 'K' : '$' + v.toFixed(2); }
+        function fmtCount(v) {
+          if (v >= 1e9) return (v/1e9).toFixed(1) + 'B';
+          if (v >= 1e6) return (v/1e6).toFixed(1) + 'M';
+          if (v >= 1e3) return (v/1e3).toFixed(1) + 'k';
+          return String(v);
         }
-        .card {
-          width: 320px;
-          background: var(--bg);
-          border: 1px solid var(--border);
-          border-radius: 6px;
-          color: var(--text);
-          font-size: 13px;
-          padding: 16px;
+        function fmtTokens(v) { return fmtCount(v); }
+        function dayLabel(ms) {
+          var d = new Date(ms);
+          return d.toLocaleDateString(undefined, { month: 'short', day: 'numeric' });
         }
-        .title {
-          font-size: 13px;
-          font-weight: 600;
-          margin-bottom: 14px;
+        function niceMax(v) {
+          if (v <= 0) return 1;
+          var mag = Math.pow(10, Math.floor(Math.log(v) / Math.LN10));
+          var norm = v / mag;
+          return (norm <= 1 ? 1 : norm <= 2 ? 2 : norm <= 5 ? 5 : 10) * mag;
         }
-        .row-label {
-          display: flex;
-          justify-content: space-between;
-          align-items: baseline;
-          margin-bottom: 6px;
+        function metricValues(m) {
+          return DATA.days.map(function (d) { return m === 'spend' ? d.cost : m === 'requests' ? d.requests : d.tokens; });
         }
-        .row-label .name { font-weight: 600; font-size: 13px; }
-        .row-label .resets { font-size: 11px; color: var(--text-dim); }
-        .bar {
-          height: 4px;
-          width: 100%;
-          background: var(--track);
-          border-radius: 2px;
-          overflow: hidden;
-          margin-bottom: 6px;
+        function metricFmt(m) {
+          return m === 'spend' ? fmtUsd : m === 'requests' ? fmtCount : fmtTokens;
         }
-        .bar-fill { height: 100%; background: var(--accent); border-radius: 2px; }
-        .row-sub {
-          display: flex;
-          justify-content: space-between;
-          align-items: baseline;
-          margin-bottom: 16px;
-          font-size: 12px;
+        function metricUnit(m) { return m === 'spend' ? '' : m === 'requests' ? ' requests' : ' tokens'; }
+        function metricTotal(m) {
+          var vals = metricValues(m);
+          return vals.reduce(function (a, b) { return a + b; }, 0);
         }
-        .row-sub .used { color: var(--text-dim); }
-        .row-sub .pct { font-weight: 600; }
-        .section:last-of-type .row-sub { margin-bottom: 14px; }
-        .divider { border-top: 1px solid var(--divider); margin: 0 -16px 12px; }
-        .stats { display: flex; justify-content: space-between; margin-bottom: 10px; }
-        .stats:last-of-type { margin-bottom: 14px; }
-        .stat { flex: 1; }
-        .stat .label { color: var(--text-dim); font-size: 11px; margin-bottom: 2px; }
-        .stat .value { font-weight: 600; font-size: 13px; }
-        .footer {
-          display: flex;
-          gap: 16px;
-          padding-top: 12px;
-          border-top: 1px solid var(--divider);
-          margin: 0 -16px;
-          padding-left: 16px;
+        function showTooltip(x, y, html) {
+          ttip.innerHTML = html;
+          ttip.style.display = 'block';
+          var r = box.getBoundingClientRect();
+          var px = x - r.left + 16, py = y - r.top + 14;
+          if (px + 220 > r.width) px = x - r.left - 220;
+          if (py + 60 > r.height) py = y - r.top - 60;
+          ttip.style.left = px + 'px';
+          ttip.style.top = py + 'px';
         }
-        .footer a { color: var(--accent); font-size: 12px; text-decoration: none; }
-        .footer a:hover { text-decoration: underline; }
-      </style>
-    </head>
-    <body>
-      <div class="card">
-        <div class="title">${escapeHtml(profileLabel)} - Usage</div>
+        function hideTooltip() { ttip.style.display = 'none'; }
+
+        function drawLine(m) {
+          var W = box.clientWidth, H = box.clientHeight;
+          if (!W || !H) return;
+          svg.setAttribute('viewBox', '0 0 ' + W + ' ' + H);
+          clear();
+          var padL = 44, padR = 10, padT = 12, padB = 24;
+          var plotW = Math.max(1, W - padL - padR), plotH = Math.max(1, H - padT - padB);
+          var vals = metricValues(m);
+          var maxVal = niceMax(Math.max.apply(null, vals) * 1.15);
+          var color = m === 'spend' ? '#e3b341' : m === 'requests' ? '#5aa9ff' : '#3fdbb0';
+          var fmt = metricFmt(m), unit = metricUnit(m);
+          var n = DATA.days.length;
+
+          var defs = el('defs', {});
+          var grad = el('linearGradient', { id: 'grad', x1: '0', y1: '0', x2: '0', y2: '1' });
+          grad.appendChild(el('stop', { offset: '0%', 'stop-color': color, 'stop-opacity': '0.30' }));
+          grad.appendChild(el('stop', { offset: '100%', 'stop-color': color, 'stop-opacity': '0' }));
+          defs.appendChild(grad);
+          svg.appendChild(defs);
+
+          var bands = 4;
+          for (var i = 0; i <= bands; i++) {
+            var gy = padT + (plotH * i / bands);
+            var v = maxVal * (1 - i / bands);
+            svg.appendChild(el('line', { x1: padL, y1: gy, x2: W - padR, y2: gy, stroke: 'rgba(255,255,255,0.06)', 'stroke-width': '1' }));
+            svg.appendChild(el('text', { x: padL - 8, y: gy + 3, 'text-anchor': 'end', fill: '#5b6472', 'font-size': '9' }, fmt(v)));
+          }
 
-        ${usageRollingMeterVisible() ? usageCardSectionHtml("Session (5h rolling)", s.session) : ""}
-        ${usageCardSectionHtml("Weekly", s.weekly)}
-        ${usageCardSectionHtml("Monthly", s.monthly)}
+          var step = n > 1 ? plotW / (n - 1) : plotW;
+          var points = DATA.days.map(function (d, i) {
+            var x = padL + step * i;
+            var y = padT + plotH - (vals[i] / maxVal) * plotH;
+            return { x: x, y: y, v: vals[i], day: d };
+          });
 
-        <div class="divider"></div>
+          var labelEvery = Math.max(1, Math.ceil(n / Math.max(3, Math.floor(plotW / 46))));
+          DATA.days.forEach(function (d, i) {
+            if (i % labelEvery !== 0 && i !== n - 1) return;
+            svg.appendChild(el('text', { x: padL + step * i, y: H - 6, 'text-anchor': 'middle', fill: '#5b6472', 'font-size': '9' }, dayLabel(d.dayStart)));
+          });
 
-        ${usageCodebaseRowVisible() ? usageCardStatsHtml("Codebase (all-time)", s.codebase) : ""}
-        ${usageCardStatsHtml("Today", s.today)}
-        ${usageCardStatsHtml("Yesterday", s.yesterday)}
+          var pathD = points.map(function (p, i) { return (i === 0 ? 'M' : 'L') + p.x.toFixed(1) + ',' + p.y.toFixed(1); }).join(' ');
+          var areaD = pathD + ' L' + points[points.length - 1].x.toFixed(1) + ',' + (padT + plotH) + ' L' + points[0].x.toFixed(1) + ',' + (padT + plotH) + ' Z';
+          svg.appendChild(el('path', { d: areaD, fill: 'url(#grad)', stroke: 'none' }));
+          svg.appendChild(el('path', { d: pathD, fill: 'none', stroke: color, 'stroke-width': '2', 'stroke-linejoin': 'round', 'stroke-linecap': 'round' }));
+
+          // cursor-follow nearest-day tooltip + visible dots
+          var hits = points.map(function (p, i) {
+            var c = el('circle', { cx: p.x, cy: p.y, r: '10', fill: 'transparent', stroke: 'none' });
+            c.addEventListener('mousemove', function (ev) { showDay(ev, p, i); });
+            c.addEventListener('mouseleave', hideTooltip);
+            svg.appendChild(c);
+            return c;
+          });
+          function showDay(ev, p, i) {
+            svg.querySelectorAll('.dot').forEach(function (d) { d.remove(); });
+            svg.appendChild(el('circle', { 'class': 'dot', cx: p.x, cy: p.y, r: '3.5', fill: color, stroke: '#161a20', 'stroke-width': '2' }));
+            showTooltip(ev.clientX, ev.clientY,
+              '<span class="t-line">' + dayLabel(p.day.dayStart) + '</span><b>' + fmt(p.v) + '</b>' + unit +
+              '<div class="t-sub">' + fmtCount(p.day.tokens) + ' tokens · ' + fmtCount(p.day.requests) + ' requests</div>');
+          }
+          void hits;
+          svg.appendChild(el('line', { x1: padL, y1: padT + plotH, x2: W - padR, y2: padT + plotH, stroke: '#242a33', 'stroke-width': '1' }));
+        }
 
-        <div class="footer">
-          <a href="command:opencodego.setUsageTargets">Set spent targets</a>
-          ${nonLegacyCount(profilesCache) > 0 ? '<a href="command:opencodego.renameActiveProfile">Rename</a>' : ""}
-        </div>
-      </div>
+        function drawModels() {
+          var W = box.clientWidth, H = box.clientHeight;
+          if (!W || !H) return;
+          svg.setAttribute('viewBox', '0 0 ' + W + ' ' + H);
+          clear();
+
+          // per-model totals (spend) to rank bars; segments = days
+          var totals = {};
+          var perModel = {};
+          DATA.byModel.forEach(function (p) {
+            totals[p.model] = (totals[p.model] || 0) + p.cost;
+            (perModel[p.model] = perModel[p.model] || []).push(p);
+          });
+          var models = Object.keys(totals).sort(function (a, b) { return totals[b] - totals[a]; });
+          if (models.length === 0) {
+            svg.appendChild(el('text', { x: W / 2, y: H / 2, 'text-anchor': 'middle', fill: '#5b6472', 'font-size': '11' }, 'No usage in the last ' + DATA.windowDays + ' days'));
+            return;
+          }
+          var dayIndex = {};
+          DATA.days.forEach(function (d, i) { dayIndex[d.dayStart] = i; });
+          var dayCount = DATA.days.length;
+          var maxTotal = niceMax(Math.max.apply(null, models.map(function (m) { return totals[m]; })) * 1.15);
+
+          var labelW = Math.min(W * 0.34, 160);
+          var valueW = 56;
+          var barX = labelW + 12;
+          var barW = Math.max(20, W - barX - valueW);
+          var rowH = H / models.length;
+
+          models.forEach(function (model, i) {
+            var cy = rowH * i + rowH / 2;
+            var barH = Math.min(rowH * 0.46, 18);
+            var color = MODEL_COLORS[i % MODEL_COLORS.length];
+
+            svg.appendChild(el('text', { x: labelW, y: cy + 3, 'text-anchor': 'end', fill: '#eef1f5', 'font-size': '10' }, model));
+            svg.appendChild(el('rect', { x: barX, y: cy - barH / 2, width: barW, height: barH, rx: 4, fill: 'rgba(255,255,255,0.05)' }));
+
+            // stacked segments, oldest day at the left
+            var days = perModel[model].slice().sort(function (a, b) { return a.dayStart - b.dayStart; });
+            var x = barX;
+            days.forEach(function (p) {
+              var segW = Math.max(1, (p.cost / maxTotal) * barW);
+              var seg = el('rect', { x: x, y: cy - barH / 2, width: segW, height: barH, rx: 2, fill: color, 'fill-opacity': String(0.35 + 0.6 * ((dayIndex[p.dayStart] + 1) / dayCount)) });
+              seg.addEventListener('mousemove', function (ev) {
+                showTooltip(ev.clientX, ev.clientY,
+                  '<span class="t-line">' + model + ' · ' + dayLabel(p.dayStart) + '</span><b>' + fmtUsd(p.cost) + '</b>' +
+                  '<div class="t-sub">' + fmtCount(p.tokens) + ' tokens · ' + fmtCount(p.requests) + ' requests</div>');
+              });
+              seg.addEventListener('mouseleave', hideTooltip);
+              svg.appendChild(seg);
+              x += segW;
+            });
+
+            var val = el('text', { x: barX + barW + 8, y: cy + 3, 'text-anchor': 'start', fill: '#9aa4b2', 'font-size': '10' });
+            val.textContent = fmtUsd(totals[model]);
+            svg.appendChild(val);
+          });
+          svg.appendChild(el('text', { x: barX, y: H - 6, 'text-anchor': 'start', fill: '#5b6472', 'font-size': '9' }, 'Segments = days (hover for model · day breakdown)'));
+        }
+
+        function render(key) {
+          current = key;
+          var fmt = metricFmt(key), unit = metricUnit(key);
+          if (key === 'models') {
+            chips.innerHTML =
+              '<div class="stat-chip"><div class="k">Total spend</div><div class="v">' + fmtUsd(metricTotal('spend')) + '</div></div>' +
+              '<div class="stat-chip"><div class="k">Window</div><div class="v">' + DATA.windowDays + ' days</div></div>';
+            drawModels();
+            return;
+          }
+          var st = DATA.stats;
+          var totalKey = key === 'spend' ? 'total' : key;
+          chips.innerHTML =
+            '<div class="stat-chip"><div class="k">' + st.today.label + '</div><div class="v">' + fmt(key === 'spend' ? st.today.cost : st.today[key]) + '</div></div>' +
+            '<div class="stat-chip"><div class="k">' + st.yesterday.label + '</div><div class="v">' + fmt(key === 'spend' ? st.yesterday.cost : st.yesterday[key]) + '</div></div>' +
+            '<div class="stat-chip"><div class="k">' + (key === 'spend' ? st.total.label : 'Total ' + key) + '</div><div class="v">' + fmt(key === 'spend' ? st.total.cost : st.total[key]) + '</div></div>';
+          void unit;
+          drawLine(key);
+        }
+
+        document.getElementById('tabs').addEventListener('click', function (e) {
+          var btn = e.target.closest('.tab-btn');
+          if (!btn) return;
+          document.querySelectorAll('.tab-btn').forEach(function (b) { b.classList.remove('active'); });
+          btn.classList.add('active');
+          render(btn.dataset.metric);
+        });
+
+        // rings
+        var ringsBox = document.getElementById('rings');
+        ringsBox.innerHTML = DATA.rings.map(function (r) {
+          var c = 2 * Math.PI * 24;
+          return '<div class="ring-card ' + r.key + '">' +
+            '<div class="ring-wrap"><svg viewBox="0 0 58 58">' +
+            '<circle class="ring-bg" cx="29" cy="29" r="24"></circle>' +
+            '<circle class="ring-fg" cx="29" cy="29" r="24" stroke-dasharray="' + c.toFixed(1) + '" stroke-dashoffset="' + c.toFixed(1) + '" data-pct="' + r.percent + '"></circle>' +
+            '</svg><div class="ring-pct">' + Math.round(r.percent) + '%</div></div>' +
+            '<div class="ring-info"><div class="label">' + r.label + '</div>' +
+            '<div class="reset">resets in ' + r.resetsIn + '</div>' +
+            '<div class="amounts"><b>' + fmtUsd(r.spent) + '</b> / ' + fmtUsd(r.limit) + '</div></div></div>';
+        }).join('');
+        document.querySelectorAll('.ring-fg').forEach(function (circle) {
+          var pct = Math.max(0, Math.min(100, parseFloat(circle.getAttribute('data-pct'))));
+          var c = 2 * Math.PI * 24;
+          requestAnimationFrame(function () {
+            setTimeout(function () { circle.style.strokeDashoffset = String(c - (pct / 100) * c); }, 120);
+          });
+        });
+
+        var resizeTimer = null;
+        function scheduleRedraw() {
+          if (resizeTimer) cancelAnimationFrame(resizeTimer);
+          resizeTimer = requestAnimationFrame(function () { render(current); });
+        }
+        if (window.ResizeObserver) new ResizeObserver(scheduleRedraw).observe(box);
+        else window.addEventListener('resize', scheduleRedraw);
+
+        render('spend');
+      })();
+      </script>
     </body>
     </html>
   `;
 }
 
-/** One meter section: label + resets, bar, used + percent. */
-function usageCardSectionHtml(label: string, p: _UsageSummary["session"]): string {
-  const pct = p.percent.toFixed(1);
-  const width = Math.min(Math.max(p.percent, 0), 100);
-  return [
-    '<div class="section">',
-    '<div class="row-label">',
-    `<span class="name">${escapeHtml(label)}</span>`,
-    `<span class="resets">Resets in ${escapeHtml(formatRelativeTime(p.resetsAt))}</span>`,
-    "</div>",
-    `<div class="bar"><div class="bar-fill" style="width:${width}%"></div></div>`,
-    '<div class="row-sub">',
-    `<span class="used">${escapeHtml(`${formatUsd(p.spent)} / ${formatUsd(p.limit)} used`)}</span>`,
-    `<span class="pct">${pct}%</span>`,
-    "</div>",
-    "</div>",
-  ].join("");
-}
-
-/** One stats row: three label-over-value columns. */
-function usageCardStatsHtml(label: string, day: _UsageSummary["today"]): string {
-  return [
-    '<div class="stats">',
-    `<div class="stat"><div class="label">${escapeHtml(label)}</div><div class="value">${escapeHtml(formatUsd(day.cost))}</div></div>`,
-    `<div class="stat"><div class="label">Requests</div><div class="value">${formatCount(day.requests)}</div></div>`,
-    `<div class="stat"><div class="label">Tokens</div><div class="value">${escapeHtml(formatTokenCount(day.tokens))}</div></div>`,
-    "</div>",
-  ].join("");
-}
-
 function buildUsageTooltip(s: ReturnType<GoUsageTracker["getSummary"]>): vscode.MarkdownString {
   const md = new vscode.MarkdownString("", true);
   md.supportHtml = true;
@@ -1766,7 +2078,7 @@ ${text(noDataMsg ?? "No usage data yet. Send a chat message to start tracking.",
   // stable regardless of whether a session is currently active.
   const deviceRows: Array<[string, number, number, number, number]> = [];
   if (usageCodebaseRowVisible()) {
-    deviceRows.push(["Codebase:", s.codebase.cost, s.codebase.requests, s.codebase.tokens, firstRowY]);
+    deviceRows.push(["Total spend:", s.codebase.cost, s.codebase.requests, s.codebase.tokens, firstRowY]);
   }
   const codebaseOffset = usageCodebaseRowVisible() ? 1 : 0;
   deviceRows.push(["Today:", s.today.cost, s.today.requests, s.today.tokens, firstRowY + codebaseOffset * rowGap]);
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index 75eb549..bf52e55 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -310,7 +310,8 @@ const HISTORY_ROWS_SQL = `
     CAST(json_extract(data, '$.tokens.output') AS INTEGER) AS tokensOutput,
     CAST(json_extract(data, '$.tokens.reasoning') AS INTEGER) AS tokensReasoning,
     CAST(json_extract(data, '$.tokens.cache.read') AS INTEGER) AS tokensCacheRead,
-    json_extract(data, '$.path.cwd') AS cwd
+    json_extract(data, '$.path.cwd') AS cwd,
+    json_extract(data, '$.modelID') AS modelId
   FROM message
   WHERE json_valid(data)
     AND json_extract(data, '$.providerID') = 'opencode-go'
@@ -327,6 +328,8 @@ export interface HistoryRow {
   tokensCacheRead: number;
   /** Working directory of the session the message belongs to (OpenCode CLI data). */
   cwd?: string;
+  /** Model that produced the message (OpenCode CLI data). */
+  modelId?: string;
 }
 
 /** Non-negative finite integer (tokens can legitimately be 0). */
@@ -378,6 +381,96 @@ export interface UsageDaily {
   tokens: number;
 }
 
+/** One day bucket of the usage chart. */
+export interface UsageDayPoint {
+  /** Unix ms at the START of the day (UTC or local, per the day-boundary setting). */
+  dayStart: number;
+  cost: number;
+  tokens: number;
+  requests: number;
+}
+
+/** Per-model usage for a single day (model bar chart). */
+export interface ModelDayUsage {
+  model: string;
+  dayStart: number;
+  cost: number;
+  tokens: number;
+  requests: number;
+}
+
+/** Time-series data for the usage panel charts. */
+export interface UsageSeries {
+  /** Daily totals, oldest → newest. */
+  days: UsageDayPoint[];
+  /** Per-model-per-day rows (only days with usage are present). */
+  byModel: ModelDayUsage[];
+}
+
+const DAY_MS = 24 * 60 * 60 * 1000;
+
+/**
+ * Bucket CLI rows + extension entries into per-day totals and per-model
+ * per-day rows over the last `days` days (the oldest bucket starts at
+ * `dayStartMs - (days - 1) * DAY_MS`). Pure so it can be unit-tested.
+ */
+export function buildUsageSeries(
+  rows: HistoryRow[],
+  entries: UsageLogEntry[],
+  days: number,
+  dayStartMs: number,
+  source: UsageTodayYesterdaySource = "auto",
+): UsageSeries {
+  const dayCount = Math.max(1, Math.floor(days));
+  const firstDay = dayStartMs - (dayCount - 1) * DAY_MS;
+  const buckets: UsageDayPoint[] = Array.from({ length: dayCount }, (_, i) => ({
+    dayStart: firstDay + i * DAY_MS,
+    cost: 0,
+    tokens: 0,
+    requests: 0,
+  }));
+  const byModel = new Map<string, Map<number, ModelDayUsage>>();
+
+  const add = (model: string | undefined, timestamp: number, cost: number, tokens: number): void => {
+    const index = Math.floor((timestamp - firstDay) / DAY_MS);
+    if (index < 0 || index >= dayCount) return;
+    const day = buckets[index];
+    day.cost += cost;
+    day.tokens += tokens;
+    day.requests += 1;
+
+    const modelName = model ?? "unknown";
+    let byDay = byModel.get(modelName);
+    if (!byDay) {
+      byDay = new Map();
+      byModel.set(modelName, byDay);
+    }
+    const point = byDay.get(index) ?? { model: modelName, dayStart: day.dayStart, cost: 0, tokens: 0, requests: 0 };
+    point.cost += cost;
+    point.tokens += tokens;
+    point.requests += 1;
+    byDay.set(index, point);
+  };
+
+  if (source !== "extension") {
+    for (const row of rows) {
+      add(row.modelId, row.createdMs, row.cost, row.tokensInput + row.tokensOutput + row.tokensReasoning);
+    }
+  }
+  if (source !== "cli") {
+    for (const entry of entries) {
+      add(entry.modelId, entry.timestamp, entry.cost, entry.promptTokens + entry.completionTokens);
+    }
+  }
+
+  return {
+    days: buckets,
+    byModel: [...byModel.entries()].flatMap(([, byDay]) =>
+      [...byDay.entries()].sort((left, right) => left[0] - right[0]).map(([, point]) => point),
+    ),
+  };
+}
+
 /**
  * The CLI database can be gigabytes large and spawning `sqlite3` is a
  * synchronous, blocking call — but the usage UI (status bar, tooltip, panel,
@@ -424,6 +517,7 @@ function readOpenCodeHistoryUncached(): HistoryRow[] | null {
         tokensReasoning: positiveNumberish(row.tokensReasoning),
         tokensCacheRead: positiveNumberish(row.tokensCacheRead),
         cwd: typeof row.cwd === "string" && row.cwd.trim() ? row.cwd : undefined,
+        modelId: typeof row.modelId === "string" && row.modelId.trim() ? row.modelId : undefined,
       }));
   } catch {
     return null;
@@ -644,6 +738,16 @@ export class GoUsageTracker {
     return sumDailyUsage(rows, this.entries, dayStartMs, this.todayYesterdaySource());
   }
 
+  /**
+   * Time-series data for the usage panel: per-day totals and per-model
+   * per-day rows over the last `days` days.
+   */
+  getUsageSeries(days: number): UsageSeries {
+    const nowMs = Date.now();
+    const rows = readOpenCodeHistory() ?? [];
+    return buildUsageSeries(rows, this.entries, days, this.dayStartMs(nowMs), this.todayYesterdaySource());
+  }
+
   /**
    * All-time usage in the CURRENT workspace, derived from the OpenCode CLI
    * history (`path.cwd` of each session's messages). "Forever" by default —
diff --git a/src/test/goUsageTracker.test.ts b/src/test/goUsageTracker.test.ts
index 9b84bef..de0aca4 100644
--- a/src/test/goUsageTracker.test.ts
+++ b/src/test/goUsageTracker.test.ts
@@ -16,6 +16,7 @@ import {
 } from "../config.js";
 import type { GoUsageApiResponse } from "../goUsageSync";
 import type { HistoryRow, UsageDaily, UsageLogEntry, UsageSummary } from "../goUsageTracker.js";
+import type { UsageSeries } from "../goUsageTracker.js";
 
 // ── Types (populated by dynamic import in before()) ────────────────────────
 
@@ -29,6 +30,13 @@ let estimateCost: (
 ) => number;
 
 let sumDailyUsage: (rows: HistoryRow[], entries: UsageLogEntry[], dayStartMs: number, source?: "auto" | "cli" | "extension") => UsageDaily;
+let buildUsageSeries: (
+  rows: HistoryRow[],
+  entries: UsageLogEntry[],
+  days: number,
+  dayStartMs: number,
+  source?: "auto" | "cli" | "extension",
+) => UsageSeries;
 let isCwdInWorkspace: (cwd: string | undefined, workspaceFolders: readonly string[]) => boolean;
 let normalizeCwd: (value: string) => string;
 let startOfLocalDay: (nowMs: number) => number;
@@ -148,6 +156,7 @@ describe("goUsageTracker", () => {
     estimateCost = mod.estimateCost;
     GoUsageTracker = mod.GoUsageTracker as GoUsageTrackerConstructor;
     sumDailyUsage = mod.sumDailyUsage;
+    buildUsageSeries = mod.buildUsageSeries;
     isCwdInWorkspace = mod.isCwdInWorkspace;
     normalizeCwd = mod.normalizeCwd;
     startOfLocalDay = mod.startOfLocalDay;
@@ -724,3 +733,95 @@ describe("server usage snapshot persistence", () => {
     assert.ok(summary.weekly.limit > 0);
   });
 });
+
+describe("buildUsageSeries", () => {
+  const now = new Date();
+  const dayMs = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate());
+  const DAY = 24 * 60 * 60 * 1000;
+
+  const rows: HistoryRow[] = [
+    {
+      createdMs: dayMs - DAY,
+      cost: 0.1,
+      tokensInput: 100,
+      tokensOutput: 50,
+      tokensReasoning: 0,
+      tokensCacheRead: 0,
+      cwd: "/repo",
+      modelId: "qwen3.6-plus",
+    },
+    {
+      createdMs: dayMs - DAY + 1000,
+      cost: 0.2,
+      tokensInput: 200,
+      tokensOutput: 100,
+      tokensReasoning: 0,
+      tokensCacheRead: 0,
+      cwd: "/repo",
+      modelId: "deepseek-v4-flash",
+    },
+    {
+      createdMs: dayMs,
+      cost: 0.3,
+      tokensInput: 300,
+      tokensOutput: 150,
+      tokensReasoning: 0,
+      tokensCacheRead: 0,
+      cwd: "/repo",
+      modelId: "qwen3.6-plus",
+    },
+    {
+      createdMs: dayMs + DAY * 5,
+      cost: 0.4,
+      tokensInput: 400,
+      tokensOutput: 200,
+      tokensReasoning: 0,
+      tokensCacheRead: 0,
+      cwd: "/repo",
+      modelId: "qwen3.6-plus",
+    },
+  ];
+  const entries: UsageLogEntry[] = [
+    { timestamp: dayMs, modelId: "glm-5", cost: 0.05, promptTokens: 30, completionTokens: 10, cachedTokens: 0, sessionId: "s1" },
+  ];
+
+  it("buckets rows and entries into per-day totals over the window", () => {
+    const series = buildUsageSeries(rows, entries, 14, dayMs, "auto");
+    assert.equal(series.days.length, 14);
+    const oldest = series.days[0]; // oldest bucket = dayMs - 13*DAY
+    assert.equal(oldest.dayStart, dayMs - 13 * DAY);
+    assert.equal(oldest.cost, 0, "day before any usage stays zero");
+
+    const yesterday = series.days[13 - 1];
+    assert.equal(yesterday.requests, 2);
+    assert.ok(Math.abs(yesterday.cost - 0.3) < 1e-9);
+    assert.equal(yesterday.tokens, 450);
+
+    const today = series.days[13];
+    assert.equal(today.requests, 2, "row + entry on the last day");
+    assert.equal(today.tokens, 450 + 40);
+  });
+
+  it("excludes rows outside the window", () => {
+    const series = buildUsageSeries(rows, [], 3, dayMs, "cli");
+    // A 3-day window ending at dayMs covers dayMs-2*DAY .. dayMs; the
+    // dayMs + DAY*5 row is outside and must be excluded.
+    const total = series.days.reduce((sum, d) => sum + d.requests, 0);
+    assert.equal(total, 3, "three rows are inside the 3-day window, the future one is not");
+  });
+
+  it("groups per-model per-day rows with correct totals", () => {
+    const series = buildUsageSeries(rows, entries, 14, dayMs, "auto");
+    const qwen = series.byModel.filter((p) => p.model === "qwen3.6-plus");
+    assert.equal(qwen.length, 2, "the dayMs + DAY*5 row is outside the 14-day window ending at dayMs");
+    const qwenToday = qwen.find((p) => p.dayStart === dayMs);
+    assert.equal(qwenToday?.cost, 0.3);
+    const glm = series.byModel.find((p) => p.model === "glm-5");
+    assert.equal(glm?.requests, 1);
+  });
+
+  it("cli source ignores extension entries", () => {
+    const series = buildUsageSeries(rows, entries, 14, dayMs, "cli");
+    assert.ok(!series.byModel.some((p) => p.model === "glm-5"));
+  });
+});

From 7e53726635239b77f14bc4b162763629bf24c76e Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 11:53:10 +0500
Subject: [PATCH 31/43] feat(usage): top-right action buttons, model line
 charts, refresh command
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- The Set targets / Rename links become styled buttons in the panel's
  top-right corner, joined by a new Refresh button (opencodego.refreshUsage
  command — instant manual refresh; the 'auto-refreshes every Ns' note is
  removed, the background loop still runs).
- By-model tab is now a line chart too: overlapping colored lines per
  model (spend over the chart window) with a ranked legend and hover
  tooltips per model · day.
- Keyboard shortcut removed; 'last N days' dropped from the brand subtitle.
- Webview wires the legend element and clears it on the other tabs.
---
 CHANGELOG.md     |   2 +-
 package.json     |   8 ---
 src/extension.ts | 133 ++++++++++++++++++++++++++++++-----------------
 3 files changed, 86 insertions(+), 57 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a1a332c..ddba6d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
-- **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (horizontal bars stacked per day — hover any segment for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Open the panel instantly with `Ctrl+Shift+Alt+U` (`Cmd+Shift+Alt+U` on macOS) or the existing "Open full usage panel" quick-pick action.
+- **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** (instant manual refresh — the auto-refresh note is gone; the background loop still runs at `usageRefreshIntervalSeconds`).
 
 - **`[Usage]` Realtime updates.** The status bar, tooltip and usage panel now refresh on a configurable background cadence (`opencodego.usageRefreshIntervalSeconds`, default 60s, min 5s), so terminal-side OpenCode CLI usage, server meters and midnight day rollovers appear without waiting for the next chat request. Changing any usage-view setting repaints the UI immediately, and the refresh interval itself applies live on the next tick.
 
diff --git a/package.json b/package.json
index 6d4436f..6c68d23 100644
--- a/package.json
+++ b/package.json
@@ -61,14 +61,6 @@
   ],
   "main": "./out/extension.js",
   "contributes": {
-    "keybindings": [
-      {
-        "command": "opencodego.showUsageDetails",
-        "key": "ctrl+shift+alt+u",
-        "mac": "cmd+shift+alt+u",
-        "when": "!inQuickOpen"
-      }
-    ],
     "commands": [
       {
         "command": "opencodego.manage",
diff --git a/src/extension.ts b/src/extension.ts
index 3332d47..b9a2d51 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -861,6 +861,9 @@ export function activate(context: vscode.ExtensionContext) {
     vscode.commands.registerCommand("opencodego.showUsageDetails", () => {
       showUsageWebview(context);
     }),
+    vscode.commands.registerCommand("opencodego.refreshUsage", () => {
+      refreshGoUsageStatusBar();
+    }),
     vscode.commands.registerCommand("opencodego.setUsageTargets", async () => {
       const tracker = activeGoUsageTracker();
       if (!tracker) return;
@@ -1514,6 +1517,7 @@ function updateWebviewContent(): void {
       *{ min-width:0; min-height:0; }
 
       .topbar{ grid-area:topbar; display:flex; align-items:center; gap: var(--s); }
+      .topbar .actions{ margin-left:auto; display:flex; gap: calc(var(--s)/2); flex:none; }
       .brand{ display:flex; align-items:center; gap: clamp(6px,1vw,10px); min-width:0; }
       .brand .mark{
         width: clamp(20px, 2.4vh, 28px); height: clamp(20px, 2.4vh, 28px);
@@ -1581,10 +1585,21 @@ function updateWebviewContent(): void {
       .ttip b{ color:var(--text-hi); }
       .ttip .t-sub{ color:var(--text-mid); font-size:10px; margin-top:2px; }
 
-      .foot{ display:flex; gap: var(--s); flex:none; align-items:center; }
-      .foot a{ color:var(--text-mid); font-size: clamp(9.5px, 1.1vh, 11px); text-decoration:none; cursor:pointer; }
-      .foot a:hover{ color:var(--text-hi); text-decoration:underline; }
-      .foot .spacer{ flex:1; }
+      .btn{
+        background:var(--bg-2); border:1px solid var(--line); color:var(--text-mid);
+        font-family:var(--sans); font-size: clamp(9.5px, 1.1vh, 11px); font-weight:600;
+        padding: clamp(5px, 0.8vh, 8px) clamp(10px, 1.4vh, 14px);
+        border-radius: calc(var(--radius) - 4px); text-decoration:none; cursor:pointer;
+        white-space:nowrap; transition: background .15s ease, color .15s ease, border-color .15s ease;
+      }
+      .btn:hover{ background:var(--bg-3); color:var(--text-hi); border-color:var(--text-lo); }
+      .btn.primary{ color:var(--text-hi); border-color:var(--line); }
+      .btn.primary:hover{ border-color:var(--amber); }
+
+      .legend{ display:flex; gap: var(--s); flex-wrap:wrap; flex:none; align-items:center; }
+      .legend .l-item{ display:flex; align-items:center; gap:5px; font-size: clamp(9px, 1.05vh, 11px); color:var(--text-mid); white-space:nowrap; }
+      .legend .l-swatch{ width:14px; height:3px; border-radius:2px; flex:none; }
+      .legend .l-more{ color:var(--text-lo); font-size: clamp(9px, 1.05vh, 11px); }
 
       @media (max-width: 620px){
         .rings-row{ flex-wrap:wrap; }
@@ -1601,7 +1616,12 @@ function updateWebviewContent(): void {
         <div class="brand">
           <div class="mark">OC</div>
           <div class="name">${escapeHtml(profileLabel)} — Usage</div>
-          <div class="sub">opencode-copilot-chat · last ${String(chartDays)} days</div>
+          <div class="sub">opencode-copilot-chat</div>
+        </div>
+        <div class="actions">
+          <a class="btn" href="command:opencodego.setUsageTargets" title="Set manual spent targets for Session / Weekly / Monthly">Set targets</a>
+          ${nonLegacyCount(profilesCache) > 0 ? '<a class="btn" href="command:opencodego.renameActiveProfile" title="Rename the active profile">Rename</a>' : ""}
+          <a class="btn primary" href="command:opencodego.refreshUsage" title="Refresh usage data now">Refresh</a>
         </div>
       </div>
 
@@ -1617,16 +1637,11 @@ function updateWebviewContent(): void {
           </div>
           <div class="stat-chips" id="statChips"></div>
         </div>
+        <div class="legend" id="legend"></div>
         <div class="chart-box" id="chartBox">
           <svg id="chartSvg" xmlns="http://www.w3.org/2000/svg"></svg>
           <div class="ttip" id="ttip"></div>
         </div>
-        <div class="foot">
-          <a href="command:opencodego.setUsageTargets">Set spent targets</a>
-          ${nonLegacyCount(profilesCache) > 0 ? '<a href="command:opencodego.renameActiveProfile">Rename profile</a>' : ""}
-          <span class="spacer"></span>
-          <a href="command:opencodego.setUsageTargets">Auto-refreshes every ${String(usageRefreshIntervalSeconds())}s</a>
-        </div>
       </div>
 
       <script type="application/json" id="usage-data">${jsonForWebview(data)}</script>
@@ -1755,13 +1770,13 @@ function updateWebviewContent(): void {
           svg.appendChild(el('line', { x1: padL, y1: padT + plotH, x2: W - padR, y2: padT + plotH, stroke: '#242a33', 'stroke-width': '1' }));
         }
 
-        function drawModels() {
+        function drawModelLines() {
           var W = box.clientWidth, H = box.clientHeight;
           if (!W || !H) return;
           svg.setAttribute('viewBox', '0 0 ' + W + ' ' + H);
           clear();
 
-          // per-model totals (spend) to rank bars; segments = days
+          // per-model daily spend, ranked by total
           var totals = {};
           var perModel = {};
           DATA.byModel.forEach(function (p) {
@@ -1773,46 +1788,67 @@ function updateWebviewContent(): void {
             svg.appendChild(el('text', { x: W / 2, y: H / 2, 'text-anchor': 'middle', fill: '#5b6472', 'font-size': '11' }, 'No usage in the last ' + DATA.windowDays + ' days'));
             return;
           }
-          var dayIndex = {};
-          DATA.days.forEach(function (d, i) { dayIndex[d.dayStart] = i; });
-          var dayCount = DATA.days.length;
-          var maxTotal = niceMax(Math.max.apply(null, models.map(function (m) { return totals[m]; })) * 1.15);
-
-          var labelW = Math.min(W * 0.34, 160);
-          var valueW = 56;
-          var barX = labelW + 12;
-          var barW = Math.max(20, W - barX - valueW);
-          var rowH = H / models.length;
-
-          models.forEach(function (model, i) {
-            var cy = rowH * i + rowH / 2;
-            var barH = Math.min(rowH * 0.46, 18);
-            var color = MODEL_COLORS[i % MODEL_COLORS.length];
 
-            svg.appendChild(el('text', { x: labelW, y: cy + 3, 'text-anchor': 'end', fill: '#eef1f5', 'font-size': '10' }, model));
-            svg.appendChild(el('rect', { x: barX, y: cy - barH / 2, width: barW, height: barH, rx: 4, fill: 'rgba(255,255,255,0.05)' }));
+          var series = models.map(function (model) {
+            return {
+              model: model,
+              total: totals[model],
+              values: DATA.days.map(function (d) {
+                var hit = null;
+                (perModel[model] || []).forEach(function (p) { if (p.dayStart === d.dayStart) hit = p; });
+                return hit ? hit : { cost: 0, tokens: 0, requests: 0, dayStart: d.dayStart };
+              }),
+            };
+          });
+          var maxVal = niceMax(Math.max.apply(null, series.map(function (s) { return s.total; })) * 1.15);
+
+          var padL = 44, padR = 10, padT = 12, padB = 24;
+          var plotW = Math.max(1, W - padL - padR), plotH = Math.max(1, H - padT - padB);
+          var n = DATA.days.length;
+          var step = n > 1 ? plotW / (n - 1) : plotW;
 
-            // stacked segments, oldest day at the left
-            var days = perModel[model].slice().sort(function (a, b) { return a.dayStart - b.dayStart; });
-            var x = barX;
-            days.forEach(function (p) {
-              var segW = Math.max(1, (p.cost / maxTotal) * barW);
-              var seg = el('rect', { x: x, y: cy - barH / 2, width: segW, height: barH, rx: 2, fill: color, 'fill-opacity': String(0.35 + 0.6 * ((dayIndex[p.dayStart] + 1) / dayCount)) });
-              seg.addEventListener('mousemove', function (ev) {
+          var bands = 4;
+          for (var i = 0; i <= bands; i++) {
+            var gy = padT + (plotH * i / bands);
+            var v = maxVal * (1 - i / bands);
+            svg.appendChild(el('line', { x1: padL, y1: gy, x2: W - padR, y2: gy, stroke: 'rgba(255,255,255,0.06)', 'stroke-width': '1' }));
+            svg.appendChild(el('text', { x: padL - 8, y: gy + 3, 'text-anchor': 'end', fill: '#5b6472', 'font-size': '9' }, fmtUsd(v)));
+          }
+          var labelEvery = Math.max(1, Math.ceil(n / Math.max(3, Math.floor(plotW / 46))));
+          DATA.days.forEach(function (d, i) {
+            if (i % labelEvery !== 0 && i !== n - 1) return;
+            svg.appendChild(el('text', { x: padL + step * i, y: H - 6, 'text-anchor': 'middle', fill: '#5b6472', 'font-size': '9' }, dayLabel(d.dayStart)));
+          });
+
+          // one overlapping line per model (spend), colored per model
+          series.forEach(function (s, si) {
+            var color = MODEL_COLORS[si % MODEL_COLORS.length];
+            var pts = s.values.map(function (p, i) {
+              return { x: padL + step * i, y: padT + plotH - (p.cost / maxVal) * plotH, p: p };
+            });
+            var d = pts.map(function (p, i) { return (i === 0 ? 'M' : 'L') + p.x.toFixed(1) + ',' + p.y.toFixed(1); }).join(' ');
+            svg.appendChild(el('path', { d: d, fill: 'none', stroke: color, 'stroke-width': '1.6', 'stroke-linejoin': 'round', 'stroke-linecap': 'round' }));
+            pts.forEach(function (p, i) {
+              if (p.p.cost <= 0) return;
+              var c = el('circle', { cx: p.x, cy: p.y, r: '7', fill: 'transparent', stroke: 'none' });
+              c.addEventListener('mousemove', function (ev) {
                 showTooltip(ev.clientX, ev.clientY,
-                  '<span class="t-line">' + model + ' · ' + dayLabel(p.dayStart) + '</span><b>' + fmtUsd(p.cost) + '</b>' +
-                  '<div class="t-sub">' + fmtCount(p.tokens) + ' tokens · ' + fmtCount(p.requests) + ' requests</div>');
+                  '<span class="t-line">' + s.model + ' · ' + dayLabel(p.p.dayStart) + '</span><b>' + fmtUsd(p.p.cost) + '</b>' +
+                  '<div class="t-sub">' + fmtCount(p.p.tokens) + ' tokens · ' + fmtCount(p.p.requests) + ' requests</div>');
               });
-              seg.addEventListener('mouseleave', hideTooltip);
-              svg.appendChild(seg);
-              x += segW;
+              c.addEventListener('mouseleave', hideTooltip);
+              svg.appendChild(c);
             });
-
-            var val = el('text', { x: barX + barW + 8, y: cy + 3, 'text-anchor': 'start', fill: '#9aa4b2', 'font-size': '10' });
-            val.textContent = fmtUsd(totals[model]);
-            svg.appendChild(val);
           });
-          svg.appendChild(el('text', { x: barX, y: H - 6, 'text-anchor': 'start', fill: '#5b6472', 'font-size': '9' }, 'Segments = days (hover for model · day breakdown)'));
+
+          svg.appendChild(el('line', { x1: padL, y1: padT + plotH, x2: W - padR, y2: padT + plotH, stroke: '#242a33', 'stroke-width': '1' }));
+
+          // legend (up to 8 models, ranked by total spend)
+          var legend = document.getElementById('legend');
+          legend.innerHTML = series.slice(0, 8).map(function (s, i) {
+            var color = MODEL_COLORS[i % MODEL_COLORS.length];
+            return '<span class="l-item"><span class="l-swatch" style="background:' + color + '"></span>' + s.model + '</span>';
+          }).join('') + (series.length > 8 ? '<span class="l-more">+' + (series.length - 8) + ' more</span>' : '');
         }
 
         function render(key) {
@@ -1822,9 +1858,10 @@ function updateWebviewContent(): void {
             chips.innerHTML =
               '<div class="stat-chip"><div class="k">Total spend</div><div class="v">' + fmtUsd(metricTotal('spend')) + '</div></div>' +
               '<div class="stat-chip"><div class="k">Window</div><div class="v">' + DATA.windowDays + ' days</div></div>';
-            drawModels();
+            drawModelLines();
             return;
           }
+          document.getElementById('legend').innerHTML = '';
           var st = DATA.stats;
           var totalKey = key === 'spend' ? 'total' : key;
           chips.innerHTML =

From 5b6f0a258d00db7e699a45c75439649c6a4ee353 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 12:05:47 +0500
Subject: [PATCH 32/43] fix(usage): working buttons, tab-preserving refresh,
 clean axes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Buttons now talk to the extension via vscode.postMessage (command-URI
  links were unreliable in the sandboxed webview): Set targets / Rename /
  Refresh all work.
- Refresh no longer reloads the whole page: the first render ships the
  template once, later refreshes push data through postMessage and the
  active tab + chart stay in place (rings re-render too).
- Extension name removed from the top bar; the brand shows only the
  profile name.
- Legend swatches are now square, sized to the text height, with proper
  spacing from the left edge.
- Y axes use round tick steps (1/2/2.5/5 x 10^n) with the max rounded up
  to a step multiple — equal, logical gaps everywhere (spend and models
  pages included; no more 1.25/2.50/3.75 divisions).
---
 CHANGELOG.md     |   2 +-
 src/extension.ts | 187 ++++++++++++++++++++++++++++++++++-------------
 2 files changed, 138 insertions(+), 51 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ddba6d0..8f023c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
-- **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** (instant manual refresh — the auto-refresh note is gone; the background loop still runs at `usageRefreshIntervalSeconds`).
+- **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
 
 - **`[Usage]` Realtime updates.** The status bar, tooltip and usage panel now refresh on a configurable background cadence (`opencodego.usageRefreshIntervalSeconds`, default 60s, min 5s), so terminal-side OpenCode CLI usage, server meters and midnight day rollovers appear without waiting for the next chat request. Changing any usage-view setting repaints the UI immediately, and the refresh interval itself applies live on the next tick.
 
diff --git a/src/extension.ts b/src/extension.ts
index b9a2d51..899dc28 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1413,11 +1413,31 @@ function showUsageWebview(context: vscode.ExtensionContext): void {
   usageWebviewPanel.onDidDispose(
     () => {
       usageWebviewPanel = undefined;
+      usageWebviewRendered = false;
     },
     null,
     context.subscriptions,
   );
 
+  usageWebviewPanel.webview.onDidReceiveMessage(
+    (message: { type?: string }) => {
+      switch (message.type) {
+        case "refresh":
+          refreshGoUsageStatusBar();
+          break;
+        case "setTargets":
+          void vscode.commands.executeCommand("opencodego.setUsageTargets");
+          break;
+        case "renameProfile":
+          void vscode.commands.executeCommand("opencodego.renameActiveProfile");
+          break;
+      }
+    },
+    null,
+    context.subscriptions,
+  );
+
+  usageWebviewRendered = false;
   updateWebviewContent();
 }
 
@@ -1426,18 +1446,18 @@ function jsonForWebview(value: unknown): string {
   return JSON.stringify(value).replace(/<\//g, "<\\/");
 }
 
-function updateWebviewContent(): void {
-  if (!usageWebviewPanel || !goUsageTracker) return;
+/** Whether the usage webview has received its initial HTML (data flows via postMessage after that). */
+let usageWebviewRendered = false;
+
+/** Build the chart/stat payload shown by the usage webview. */
+function usageWebviewData(): Record<string, unknown> | undefined {
+  if (!goUsageTracker) return undefined;
   const tracker = activeGoUsageTracker();
-  if (!tracker) {
-    usageWebviewPanel.webview.html = `<html><body><p>No active tracker</p></body></html>`;
-    return;
-  }
+  if (!tracker) return undefined;
   const s = tracker.getSummary();
   const chartDays = vscode.workspace.getConfiguration(CONFIG_SECTION).get<number>(SETTING_USAGE_CHART_DAYS, DEFAULT_USAGE_CHART_DAYS);
   const series = tracker.getUsageSeries(chartDays);
   const activeProfile = findProfile(profilesCache, activeProfileFingerprint);
-  const profileLabel = activeProfile?.label ?? "OpenCode Go";
   const showRolling = usageRollingMeterVisible();
 
   const rings = [
@@ -1471,8 +1491,9 @@ function updateWebviewContent(): void {
     },
   ];
 
-  const data = {
-    profile: profileLabel,
+  return {
+    profile: activeProfile?.label ?? "OpenCode Go",
+    showRename: nonLegacyCount(profilesCache) > 0,
     rings,
     stats: {
       total: { label: "Total spend", cost: s.codebase.cost, tokens: s.codebase.tokens, requests: s.codebase.requests },
@@ -1483,8 +1504,29 @@ function updateWebviewContent(): void {
     byModel: series.byModel,
     windowDays: chartDays,
   };
+}
 
-  usageWebviewPanel.webview.html = `
+function updateWebviewContent(): void {
+  if (!usageWebviewPanel || !goUsageTracker) return;
+  const data = usageWebviewData();
+  if (!data) {
+    usageWebviewPanel.webview.html = `<html><body><p>No active tracker</p></body></html>`;
+    usageWebviewRendered = false;
+    return;
+  }
+
+  if (!usageWebviewRendered) {
+    // First paint: render the full page. Later refreshes only push new data
+    // via postMessage so the user's active tab and chart stay in place.
+    usageWebviewPanel.webview.html = usageWebviewHtml(String(data.profile));
+    usageWebviewRendered = true;
+  }
+  void usageWebviewPanel.webview.postMessage({ type: "usage", data });
+}
+
+function usageWebviewHtml(profileLabel: string): string {
+  const data = usageWebviewData() ?? {};
+  return `
     <!DOCTYPE html>
     <html lang="en">
     <head>
@@ -1596,9 +1638,9 @@ function updateWebviewContent(): void {
       .btn.primary{ color:var(--text-hi); border-color:var(--line); }
       .btn.primary:hover{ border-color:var(--amber); }
 
-      .legend{ display:flex; gap: var(--s); flex-wrap:wrap; flex:none; align-items:center; }
-      .legend .l-item{ display:flex; align-items:center; gap:5px; font-size: clamp(9px, 1.05vh, 11px); color:var(--text-mid); white-space:nowrap; }
-      .legend .l-swatch{ width:14px; height:3px; border-radius:2px; flex:none; }
+      .legend{ display:flex; gap: clamp(10px, 1.4vh, 16px); flex-wrap:wrap; flex:none; align-items:center; padding: 2px 0 0 2px; }
+      .legend .l-item{ display:flex; align-items:center; gap:7px; font-size: clamp(10px, 1.2vh, 12px); line-height:1; color:var(--text-mid); white-space:nowrap; }
+      .legend .l-swatch{ width: clamp(10px, 1.2vh, 12px); height: clamp(10px, 1.2vh, 12px); border-radius:3px; flex:none; }
       .legend .l-more{ color:var(--text-lo); font-size: clamp(9px, 1.05vh, 11px); }
 
       @media (max-width: 620px){
@@ -1606,7 +1648,6 @@ function updateWebviewContent(): void {
         .ring-card{ flex:1 1 100%; }
         .panel-top{ flex-wrap:wrap; }
         .stat-chips{ display:none; }
-        .brand .sub{ display:none; }
       }
       @media (prefers-reduced-motion: reduce){ *{ transition:none !important; animation:none !important; } }
     </style>
@@ -1615,13 +1656,12 @@ function updateWebviewContent(): void {
       <div class="topbar">
         <div class="brand">
           <div class="mark">OC</div>
-          <div class="name">${escapeHtml(profileLabel)} — Usage</div>
-          <div class="sub">opencode-copilot-chat</div>
+          <div class="name" id="brandName">${escapeHtml(profileLabel)} — Usage</div>
         </div>
         <div class="actions">
-          <a class="btn" href="command:opencodego.setUsageTargets" title="Set manual spent targets for Session / Weekly / Monthly">Set targets</a>
-          ${nonLegacyCount(profilesCache) > 0 ? '<a class="btn" href="command:opencodego.renameActiveProfile" title="Rename the active profile">Rename</a>' : ""}
-          <a class="btn primary" href="command:opencodego.refreshUsage" title="Refresh usage data now">Refresh</a>
+          <button class="btn" id="btnTargets" title="Set manual spent targets for Session / Weekly / Monthly">Set targets</button>
+          <button class="btn" id="btnRename" title="Rename the active profile" style="display:none">Rename</button>
+          <button class="btn primary" id="btnRefresh" title="Refresh usage data now">Refresh</button>
         </div>
       </div>
 
@@ -1648,6 +1688,7 @@ function updateWebviewContent(): void {
       <script>
       (function () {
         'use strict';
+        var vscode = acquireVsCodeApi();
         var DATA = JSON.parse(document.getElementById('usage-data').textContent);
         var MODEL_COLORS = ['#e3b341','#5aa9ff','#3fdbb0','#ef7f6b','#a98ef9','#7fd1a8'];
         var svgNS = 'http://www.w3.org/2000/svg';
@@ -1682,6 +1723,27 @@ function updateWebviewContent(): void {
           var norm = v / mag;
           return (norm <= 1 ? 1 : norm <= 2 ? 2 : norm <= 5 ? 5 : 10) * mag;
         }
+        // Round tick step (1/2/2.5/5 x 10^n) so axis gaps stay clean: never
+        // 1.25 / 2.50 / 3.75-style odd divisions.
+        function niceStep(v) {
+          if (v <= 0) return 1;
+          var mag = Math.pow(10, Math.floor(Math.log(v) / Math.LN10));
+          var norm = v / mag;
+          var cand = norm <= 1 ? 1 : norm <= 2 ? 2 : norm <= 2.5 ? 2.5 : norm <= 5 ? 5 : 10;
+          return cand * mag;
+        }
+        // Round the max up to a multiple of a round step, then emit 0..top ticks.
+        function axisTicks(maxVal, bands) {
+          var step = niceStep(maxVal / Math.max(1, bands));
+          var top = Math.ceil(maxVal / step) * step;
+          var ticks = [];
+          for (var v = top; v > -1e-9; v -= step) ticks.push(Math.round(v * 10000) / 10000);
+          return { top: top, step: step, ticks: ticks };
+        }
+        function fmtAxisUsd(v) {
+          if (v >= 1000) return fmtUsd(v);
+          return '$' + String(Math.round(v * 100) / 100);
+        }
         function metricValues(m) {
           return DATA.days.map(function (d) { return m === 'spend' ? d.cost : m === 'requests' ? d.requests : d.tokens; });
         }
@@ -1714,8 +1776,11 @@ function updateWebviewContent(): void {
           var plotW = Math.max(1, W - padL - padR), plotH = Math.max(1, H - padT - padB);
           var vals = metricValues(m);
           var maxVal = niceMax(Math.max.apply(null, vals) * 1.15);
+          var axis = axisTicks(maxVal, 4);
+          maxVal = axis.top;
           var color = m === 'spend' ? '#e3b341' : m === 'requests' ? '#5aa9ff' : '#3fdbb0';
           var fmt = metricFmt(m), unit = metricUnit(m);
+          var fmtAxis = m === 'spend' ? fmtAxisUsd : fmt;
           var n = DATA.days.length;
 
           var defs = el('defs', {});
@@ -1725,13 +1790,11 @@ function updateWebviewContent(): void {
           defs.appendChild(grad);
           svg.appendChild(defs);
 
-          var bands = 4;
-          for (var i = 0; i <= bands; i++) {
-            var gy = padT + (plotH * i / bands);
-            var v = maxVal * (1 - i / bands);
+          axis.ticks.forEach(function (v) {
+            var gy = padT + plotH - (v / maxVal) * plotH;
             svg.appendChild(el('line', { x1: padL, y1: gy, x2: W - padR, y2: gy, stroke: 'rgba(255,255,255,0.06)', 'stroke-width': '1' }));
-            svg.appendChild(el('text', { x: padL - 8, y: gy + 3, 'text-anchor': 'end', fill: '#5b6472', 'font-size': '9' }, fmt(v)));
-          }
+            svg.appendChild(el('text', { x: padL - 8, y: gy + 3, 'text-anchor': 'end', fill: '#5b6472', 'font-size': '9' }, fmtAxis(v)));
+          });
 
           var step = n > 1 ? plotW / (n - 1) : plotW;
           var points = DATA.days.map(function (d, i) {
@@ -1801,19 +1864,19 @@ function updateWebviewContent(): void {
             };
           });
           var maxVal = niceMax(Math.max.apply(null, series.map(function (s) { return s.total; })) * 1.15);
+          var axis = axisTicks(maxVal, 4);
+          maxVal = axis.top;
 
           var padL = 44, padR = 10, padT = 12, padB = 24;
           var plotW = Math.max(1, W - padL - padR), plotH = Math.max(1, H - padT - padB);
           var n = DATA.days.length;
           var step = n > 1 ? plotW / (n - 1) : plotW;
 
-          var bands = 4;
-          for (var i = 0; i <= bands; i++) {
-            var gy = padT + (plotH * i / bands);
-            var v = maxVal * (1 - i / bands);
+          axis.ticks.forEach(function (v) {
+            var gy = padT + plotH - (v / maxVal) * plotH;
             svg.appendChild(el('line', { x1: padL, y1: gy, x2: W - padR, y2: gy, stroke: 'rgba(255,255,255,0.06)', 'stroke-width': '1' }));
-            svg.appendChild(el('text', { x: padL - 8, y: gy + 3, 'text-anchor': 'end', fill: '#5b6472', 'font-size': '9' }, fmtUsd(v)));
-          }
+            svg.appendChild(el('text', { x: padL - 8, y: gy + 3, 'text-anchor': 'end', fill: '#5b6472', 'font-size': '9' }, fmtAxisUsd(v)));
+          });
           var labelEvery = Math.max(1, Math.ceil(n / Math.max(3, Math.floor(plotW / 46))));
           DATA.days.forEach(function (d, i) {
             if (i % labelEvery !== 0 && i !== n - 1) return;
@@ -1880,26 +1943,28 @@ function updateWebviewContent(): void {
           render(btn.dataset.metric);
         });
 
-        // rings
-        var ringsBox = document.getElementById('rings');
-        ringsBox.innerHTML = DATA.rings.map(function (r) {
-          var c = 2 * Math.PI * 24;
-          return '<div class="ring-card ' + r.key + '">' +
-            '<div class="ring-wrap"><svg viewBox="0 0 58 58">' +
-            '<circle class="ring-bg" cx="29" cy="29" r="24"></circle>' +
-            '<circle class="ring-fg" cx="29" cy="29" r="24" stroke-dasharray="' + c.toFixed(1) + '" stroke-dashoffset="' + c.toFixed(1) + '" data-pct="' + r.percent + '"></circle>' +
-            '</svg><div class="ring-pct">' + Math.round(r.percent) + '%</div></div>' +
-            '<div class="ring-info"><div class="label">' + r.label + '</div>' +
-            '<div class="reset">resets in ' + r.resetsIn + '</div>' +
-            '<div class="amounts"><b>' + fmtUsd(r.spent) + '</b> / ' + fmtUsd(r.limit) + '</div></div></div>';
-        }).join('');
-        document.querySelectorAll('.ring-fg').forEach(function (circle) {
-          var pct = Math.max(0, Math.min(100, parseFloat(circle.getAttribute('data-pct'))));
-          var c = 2 * Math.PI * 24;
-          requestAnimationFrame(function () {
-            setTimeout(function () { circle.style.strokeDashoffset = String(c - (pct / 100) * c); }, 120);
+        // rings (re-rendered on every data refresh)
+        function renderRings() {
+          var ringsBox = document.getElementById('rings');
+          ringsBox.innerHTML = DATA.rings.map(function (r) {
+            var c = 2 * Math.PI * 24;
+            return '<div class="ring-card ' + r.key + '">' +
+              '<div class="ring-wrap"><svg viewBox="0 0 58 58">' +
+              '<circle class="ring-bg" cx="29" cy="29" r="24"></circle>' +
+              '<circle class="ring-fg" cx="29" cy="29" r="24" stroke-dasharray="' + c.toFixed(1) + '" stroke-dashoffset="' + c.toFixed(1) + '" data-pct="' + r.percent + '"></circle>' +
+              '</svg><div class="ring-pct">' + Math.round(r.percent) + '%</div></div>' +
+              '<div class="ring-info"><div class="label">' + r.label + '</div>' +
+              '<div class="reset">resets in ' + r.resetsIn + '</div>' +
+              '<div class="amounts"><b>' + fmtUsd(r.spent) + '</b> / ' + fmtUsd(r.limit) + '</div></div></div>';
+          }).join('');
+          document.querySelectorAll('.ring-fg').forEach(function (circle) {
+            var pct = Math.max(0, Math.min(100, parseFloat(circle.getAttribute('data-pct'))));
+            var c = 2 * Math.PI * 24;
+            requestAnimationFrame(function () {
+              setTimeout(function () { circle.style.strokeDashoffset = String(c - (pct / 100) * c); }, 120);
+            });
           });
-        });
+        }
 
         var resizeTimer = null;
         function scheduleRedraw() {
@@ -1909,6 +1974,28 @@ function updateWebviewContent(): void {
         if (window.ResizeObserver) new ResizeObserver(scheduleRedraw).observe(box);
         else window.addEventListener('resize', scheduleRedraw);
 
+        // buttons -> extension host
+        var refreshBtn = document.getElementById('btnRefresh');
+        document.getElementById('btnTargets').addEventListener('click', function () { vscode.postMessage({ type: 'setTargets' }); });
+        document.getElementById('btnRename').addEventListener('click', function () { vscode.postMessage({ type: 'renameProfile' }); });
+        refreshBtn.addEventListener('click', function () {
+          refreshBtn.textContent = 'Refreshing\u2026';
+          vscode.postMessage({ type: 'refresh' });
+        });
+
+        // live data updates keep the active tab (no full page reload)
+        window.addEventListener('message', function (ev) {
+          var msg = ev.data;
+          if (!msg || msg.type !== 'usage') return;
+          DATA = msg.data;
+          document.getElementById('brandName').textContent = DATA.profile + ' \u2014 Usage';
+          document.getElementById('btnRename').style.display = DATA.showRename ? '' : 'none';
+          refreshBtn.textContent = 'Refresh';
+          renderRings();
+          render(current);
+        });
+
+        renderRings();
         render('spend');
       })();
       </script>

From c80125fb895f0f31fa4f1148cc4b247296aab150 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 12:19:05 +0500
Subject: [PATCH 33/43] feat(usage): completion charts, window toggle,
 whole-chart hover
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Two new tabs, Suggested and Approved: per-day inline chat-completion
  counters persisted in globalState (COMPLETION_USAGE_KEY). Suggestions are
  counted when the provider returns ghost text; acceptances via the
  runtime-guarded onDidChangeInlineCompletionItems API (didAccept) — pure
  helpers in autocomplete/usage.ts, unit-tested.
- Window button (styled like the others) cycles Week -> 14 days -> Month ->
  Lifetime; charts re-render for the new window. buildUsageSeries and
  completionUsageToSeries support days=0 (lifetime, from earliest usage).
  The panel's Window stat chip is gone; usageChartDays setting allows 0.
- Whole-chart hover: moving the cursor anywhere over a chart snaps to the
  nearest day with a guide line + dots and a cursor-follow tooltip; the
  By-model tab's tooltip lists every model's spend for that day.
- Brand shows only the profile name (no '— Usage'); the OC mark centers
  its glyphs vertically; legend swatches are square and aligned to the text
  height; axes keep round equal tick steps.
---
 CHANGELOG.md                       |   2 +
 package.json                       |   6 +-
 src/autocomplete/index.ts          |  34 +++++
 src/autocomplete/provider.ts       |   3 +
 src/autocomplete/usage.ts          |  68 ++++++++++
 src/config.ts                      |   6 +-
 src/extension.ts                   | 191 ++++++++++++++++++++++++-----
 src/goUsageTracker.ts              |  24 +++-
 src/test/autocompleteUsage.test.ts |  59 +++++++++
 src/test/goUsageTracker.test.ts    |  10 ++
 10 files changed, 365 insertions(+), 38 deletions(-)
 create mode 100644 src/autocomplete/usage.ts
 create mode 100644 src/test/autocompleteUsage.test.ts

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f023c6..a866168 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
+- **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the By-model tab the tooltip lists every model's spend for that day. Two new tabs — **Suggested** and **Approved** — chart inline chat completions (suggestions shown by the provider and acceptances tracked via the guarded `onDidChangeInlineCompletionItems` API, persisted per day). A **Window** button (alongside Set targets / Rename / Refresh) cycles Week → 14 days → Month → Lifetime and re-renders every chart for the new window (lifetime spans the earliest recorded usage). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
+
 - **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
 
 - **`[Usage]` Realtime updates.** The status bar, tooltip and usage panel now refresh on a configurable background cadence (`opencodego.usageRefreshIntervalSeconds`, default 60s, min 5s), so terminal-side OpenCode CLI usage, server meters and midnight day rollovers appear without waiting for the next chat request. Changing any usage-view setting repaints the UI immediately, and the refresh interval itself applies live on the next tick.
diff --git a/package.json b/package.json
index 6c68d23..4171984 100644
--- a/package.json
+++ b/package.json
@@ -180,9 +180,9 @@
         "opencodego.usageChartDays": {
           "type": "number",
           "default": 14,
-          "minimum": 7,
-          "maximum": 90,
-          "description": "How many days the usage panel charts cover (daily spend / requests / tokens and the per-model breakdown)."
+          "minimum": 0,
+          "maximum": 370,
+          "description": "How many days the usage panel charts cover (daily spend / requests / tokens, per-model and chat-completion breakdowns). 0 = lifetime. The panel's Window button toggles this live (Week / 14 days / Month / Lifetime)."
         },
         "opencodego.usageDayBoundary": {
           "type": "string",
diff --git a/src/autocomplete/index.ts b/src/autocomplete/index.ts
index 78ddd5f..d2f6b96 100644
--- a/src/autocomplete/index.ts
+++ b/src/autocomplete/index.ts
@@ -12,6 +12,8 @@ import { ChatCompletionEngine } from "./engine";
 import { OpenCodeInlineCompletionProvider } from "./provider";
 import type { CompletionContext, CompletionEngine, CompletionResult } from "./types";
 import {
+  COMPLETION_USAGE_KEY,
+  COMPLETION_USAGE_MAX_DAYS,
   CONFIG_SECTION,
   DEFAULT_INLINE_DEBOUNCE_MS,
   DEFAULT_INLINE_MAX_TOKENS,
@@ -28,6 +30,7 @@ import {
   INLINE_TIMEOUT_MS_SETTING,
 } from "../config";
 import { toFiniteNumber } from "../utils";
+import { bumpCompletionUsage, utcDayStart, type CompletionUsageDay } from "./usage";
 
 export {
   INLINE_SUGGESTIONS_SETTING,
@@ -50,6 +53,8 @@ export interface InlineCompletionsDeps {
   chatCompletionsUrl: string;
   /** Resolve the API key to use (extension secret / BYOK group key). */
   resolveApiKey: () => Promise<string | undefined>;
+  /** Day boundary for the completion counters (defaults to UTC). */
+  resolveCompletionDayStart?: () => number;
   log?: (msg: string) => void;
 }
 
@@ -69,6 +74,32 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
     output.appendLine(msg);
   };
 
+  // Per-day suggestion/acceptance counters for the usage panel charts.
+  let completionUsage = context.globalState.get<CompletionUsageDay[]>(COMPLETION_USAGE_KEY, []);
+  const dayStart = (): number => deps.resolveCompletionDayStart?.() ?? utcDayStart(Date.now());
+  const recordCompletion = (kind: "suggested" | "approved"): void => {
+    completionUsage = bumpCompletionUsage(completionUsage, dayStart(), kind, COMPLETION_USAGE_MAX_DAYS);
+    void context.globalState.update(COMPLETION_USAGE_KEY, completionUsage);
+  };
+
+  // Acceptance tracking: `onDidChangeInlineCompletionItems` is not in the
+  // stable API types, so it is guarded at runtime — on hosts that have it,
+  // `didAccept` reports when the user accepted a ghost-text suggestion.
+  const onDidChangeInlineCompletionItems = (
+    vscode.languages as unknown as {
+      onDidChangeInlineCompletionItems?: (listener: (event: { didAccept?: boolean }) => unknown) => vscode.Disposable;
+    }
+  ).onDidChangeInlineCompletionItems;
+  if (typeof onDidChangeInlineCompletionItems === "function") {
+    context.subscriptions.push(
+      onDidChangeInlineCompletionItems((event) => {
+        if (event.didAccept) {
+          recordCompletion("approved");
+        }
+      }),
+    );
+  }
+
   const engine: CompletionEngine = {
     id: "chat-completions",
     async complete(ctx: CompletionContext, signal: AbortSignal): Promise<CompletionResult> {
@@ -93,6 +124,9 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
   const provider = new OpenCodeInlineCompletionProvider({
     engine,
     resolveApiKey: deps.resolveApiKey,
+    onSuggestion: () => {
+      recordCompletion("suggested");
+    },
     isEnabled: () => readSetting(INLINE_SUGGESTIONS_SETTING, false),
     resolveModelId: () => readSetting(INLINE_SUGGESTIONS_MODEL_SETTING, DEFAULT_INLINE_MODEL),
     resolveDebounceMs: () => readNumberSetting(INLINE_DEBOUNCE_MS_SETTING, DEFAULT_INLINE_DEBOUNCE_MS, 50, 2_000),
diff --git a/src/autocomplete/provider.ts b/src/autocomplete/provider.ts
index a534c5a..7119ee4 100644
--- a/src/autocomplete/provider.ts
+++ b/src/autocomplete/provider.ts
@@ -15,6 +15,8 @@ export interface InlineCompletionProviderOptions {
   engine: CompletionEngine;
   /** Resolve the API key (async; the caller owns caching/fallbacks). */
   resolveApiKey: () => Promise<string | undefined>;
+  /** Called once when a ghost-text suggestion is actually returned to VS Code. */
+  onSuggestion?: () => void;
   /** Whether suggestions are currently enabled (config-driven). */
   isEnabled: () => boolean;
   /** The model to use for suggestions (config-driven). */
@@ -104,6 +106,7 @@ export class OpenCodeInlineCompletionProvider implements vscode.InlineCompletion
           return;
         }
         finish([new vscode.InlineCompletionItem(result.text, new vscode.Range(position, position))]);
+        this.options.onSuggestion?.();
       });
     });
   }
diff --git a/src/autocomplete/usage.ts b/src/autocomplete/usage.ts
new file mode 100644
index 0000000..7a646ee
--- /dev/null
+++ b/src/autocomplete/usage.ts
@@ -0,0 +1,68 @@
+/**
+ * Per-day chat-completion usage counters (inline suggestions shown vs
+ * accepted), persisted in globalState. Pure logic so it is unit-testable.
+ */
+
+export interface CompletionUsageDay {
+  /** Unix ms at the START of the day (same boundary as the usage charts). */
+  dayStart: number;
+  /** Ghost-text suggestions the provider returned to VS Code. */
+  suggested: number;
+  /** Suggestions the user accepted (only counted when the API reports it). */
+  approved: number;
+}
+
+const DAY_MS = 24 * 60 * 60 * 1000;
+
+/** Increment one counter for the given day (mutates and returns `days`). */
+export function bumpCompletionUsage(
+  days: CompletionUsageDay[],
+  dayStart: number,
+  kind: "suggested" | "approved",
+  maxDays = 370,
+): CompletionUsageDay[] {
+  let day = days.find((d) => d.dayStart === dayStart);
+  if (!day) {
+    day = { dayStart, suggested: 0, approved: 0 };
+    days.push(day);
+    if (days.length > maxDays) {
+      days.splice(0, days.length - maxDays);
+    }
+  }
+  day[kind] += 1;
+  return days;
+}
+
+/** Start of the UTC day (the default chart boundary). */
+export function utcDayStart(nowMs: number): number {
+  const d = new Date(nowMs);
+  return Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate());
+}
+
+/**
+ * Align the stored per-day counters to a chart window. `windowDays` 0 =
+ * lifetime (from the earliest stored day to today). Days without counters
+ * are emitted as zeros so the line chart always spans the full window.
+ */
+export function completionUsageToSeries(
+  days: CompletionUsageDay[],
+  dayStartMs: number,
+  windowDays: number,
+): { dayStart: number; suggested: number; approved: number }[] {
+  const byDay = new Map(days.map((d) => [d.dayStart, d]));
+  let firstDay: number;
+  if (windowDays > 0) {
+    firstDay = dayStartMs - (Math.max(1, Math.floor(windowDays)) - 1) * DAY_MS;
+  } else if (days.length > 0) {
+    const earliest = Math.min(...days.map((d) => d.dayStart));
+    firstDay = dayStartMs - Math.ceil((dayStartMs - earliest) / DAY_MS) * DAY_MS;
+  } else {
+    firstDay = dayStartMs;
+  }
+  const count = Math.round((dayStartMs - firstDay) / DAY_MS) + 1;
+  return Array.from({ length: count }, (_, i) => {
+    const start = firstDay + i * DAY_MS;
+    const day = byDay.get(start);
+    return { dayStart: start, suggested: day?.suggested ?? 0, approved: day?.approved ?? 0 };
+  });
+}
diff --git a/src/config.ts b/src/config.ts
index 24fad89..356580c 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -184,9 +184,13 @@ export const DEFAULT_USAGE_DAY_BOUNDARY = "utc";
 /** How often the usage status bar / panel refresh in the background (seconds). */
 export const SETTING_USAGE_REFRESH_INTERVAL_SECONDS = "usageRefreshIntervalSeconds";
 export const DEFAULT_USAGE_REFRESH_INTERVAL_SECONDS = 60;
-/** How many days the usage panel charts cover. */
+/** How many days the usage panel charts cover (0 = lifetime). */
 export const SETTING_USAGE_CHART_DAYS = "usageChartDays";
 export const DEFAULT_USAGE_CHART_DAYS = 14;
+/** globalState key for the per-day chat-completion usage counters. */
+export const COMPLETION_USAGE_KEY = "opencodego.completionUsage.v1";
+/** How many days of completion history are retained. */
+export const COMPLETION_USAGE_MAX_DAYS = 370;
 
 // ─── Usage profiles (issue #63) ──────────────────────────────────────────────
 
diff --git a/src/extension.ts b/src/extension.ts
index 899dc28..d887842 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -48,6 +48,7 @@ import {
 import { providerEnabledSetting } from "./providerEnablement";
 import { isInternalDataPart, isReasoningMarkerPart, readReasoningMarker } from "./chatParts";
 import { registerInlineCompletions } from "./autocomplete";
+import { completionUsageToSeries, type CompletionUsageDay } from "./autocomplete/usage";
 import { getImageDataUrlBase64Bytes, MAX_IMAGE_BASE64_BYTES, normalizeImageDataUrl } from "./imageNormalizer";
 import { imageDescriptionKey, lookupImageDescriptions, storeImageDescriptions } from "./visionProxyCache";
 import { providerModelDisplayName } from "./modelNames";
@@ -61,6 +62,7 @@ import {
   AGENT_HOST_BYOK_ENABLED_SETTING,
   AGENT_HOST_BYOK_MINOR_VERSION,
   CAPACITY_LIMITED_MODEL_NOTES,
+  COMPLETION_USAGE_KEY,
   CONFIG_SECTION,
   DEFAULT_REQUEST_TIMEOUT_SECONDS,
   DEFAULT_STREAM_IDLE_TIMEOUT_SECONDS,
@@ -1065,6 +1067,11 @@ export function activate(context: vscode.ExtensionContext) {
       // Any usage-display setting change repaints the status bar / panel
       // immediately (no waiting for the next request or refresh tick).
       if (USAGE_DISPLAY_SETTING_KEYS.some((key) => event.affectsConfiguration(`${CONFIG_SECTION}.${key}`))) {
+        if (event.affectsConfiguration(`${CONFIG_SECTION}.${SETTING_USAGE_CHART_DAYS}`)) {
+          usageChartWindowDays = vscode.workspace
+            .getConfiguration(CONFIG_SECTION)
+            .get<number>(SETTING_USAGE_CHART_DAYS, DEFAULT_USAGE_CHART_DAYS);
+        }
         refreshGoUsageStatusBar();
         updateWebviewContent();
       }
@@ -1431,6 +1438,14 @@ function showUsageWebview(context: vscode.ExtensionContext): void {
         case "renameProfile":
           void vscode.commands.executeCommand("opencodego.renameActiveProfile");
           break;
+        case "window": {
+          const days = Number((message as { days?: unknown }).days);
+          if (Number.isFinite(days) && days >= 0 && days <= 370) {
+            usageChartWindowDays = days;
+            updateWebviewContent();
+          }
+          break;
+        }
       }
     },
     null,
@@ -1448,6 +1463,10 @@ function jsonForWebview(value: unknown): string {
 
 /** Whether the usage webview has received its initial HTML (data flows via postMessage after that). */
 let usageWebviewRendered = false;
+/** Selected chart window in days (0 = lifetime); the webview toggles it via message. */
+let usageChartWindowDays: number = vscode.workspace
+  .getConfiguration(CONFIG_SECTION)
+  .get<number>(SETTING_USAGE_CHART_DAYS, DEFAULT_USAGE_CHART_DAYS);
 
 /** Build the chart/stat payload shown by the usage webview. */
 function usageWebviewData(): Record<string, unknown> | undefined {
@@ -1455,8 +1474,10 @@ function usageWebviewData(): Record<string, unknown> | undefined {
   const tracker = activeGoUsageTracker();
   if (!tracker) return undefined;
   const s = tracker.getSummary();
-  const chartDays = vscode.workspace.getConfiguration(CONFIG_SECTION).get<number>(SETTING_USAGE_CHART_DAYS, DEFAULT_USAGE_CHART_DAYS);
-  const series = tracker.getUsageSeries(chartDays);
+  const windowDays = usageChartWindowDays;
+  const series = tracker.getUsageSeries(windowDays);
+  const completionDays = contextCompletionUsage();
+  const completions = completionUsageToSeries(completionDays, trackerDayStart(tracker), windowDays);
   const activeProfile = findProfile(profilesCache, activeProfileFingerprint);
   const showRolling = usageRollingMeterVisible();
 
@@ -1494,6 +1515,8 @@ function usageWebviewData(): Record<string, unknown> | undefined {
   return {
     profile: activeProfile?.label ?? "OpenCode Go",
     showRename: nonLegacyCount(profilesCache) > 0,
+    windowDays,
+    completions,
     rings,
     stats: {
       total: { label: "Total spend", cost: s.codebase.cost, tokens: s.codebase.tokens, requests: s.codebase.requests },
@@ -1502,10 +1525,23 @@ function usageWebviewData(): Record<string, unknown> | undefined {
     },
     days: series.days,
     byModel: series.byModel,
-    windowDays: chartDays,
   };
 }
 
+/** Read the persisted per-day completion counters. */
+function contextCompletionUsage(): CompletionUsageDay[] {
+  const stored = _extensionContext?.globalState.get<CompletionUsageDay[]>(COMPLETION_USAGE_KEY, []);
+  return Array.isArray(stored) ? stored : [];
+}
+
+/** Day-start used by the current tracker (matches the chart boundary). */
+function trackerDayStart(_tracker: GoUsageTracker): number {
+  const now = new Date();
+  return vscode.workspace.getConfiguration(CONFIG_SECTION).get<"utc" | "local">(SETTING_USAGE_DAY_BOUNDARY, "utc") === "local"
+    ? new Date(now.getFullYear(), now.getMonth(), now.getDate()).getTime()
+    : Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate());
+}
+
 function updateWebviewContent(): void {
   if (!usageWebviewPanel || !goUsageTracker) return;
   const data = usageWebviewData();
@@ -1566,7 +1602,7 @@ function usageWebviewHtml(profileLabel: string): string {
         border-radius: 7px; background:linear-gradient(135deg, var(--amber), var(--coral));
         display:flex; align-items:center; justify-content:center;
         font-family:var(--mono); font-weight:700; font-size: clamp(9px, 1.2vh, 12px);
-        color:#141205; flex:none;
+        line-height:1; color:#141205; flex:none;
       }
       .brand .name{ font-weight:700; font-size: clamp(12px, 1.6vh, 15px); letter-spacing:-0.01em; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
       .brand .sub{ color:var(--text-lo); font-size: clamp(9px, 1.1vh, 11px); font-family:var(--mono); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
@@ -1640,7 +1676,7 @@ function usageWebviewHtml(profileLabel: string): string {
 
       .legend{ display:flex; gap: clamp(10px, 1.4vh, 16px); flex-wrap:wrap; flex:none; align-items:center; padding: 2px 0 0 2px; }
       .legend .l-item{ display:flex; align-items:center; gap:7px; font-size: clamp(10px, 1.2vh, 12px); line-height:1; color:var(--text-mid); white-space:nowrap; }
-      .legend .l-swatch{ width: clamp(10px, 1.2vh, 12px); height: clamp(10px, 1.2vh, 12px); border-radius:3px; flex:none; }
+      .legend .l-swatch{ width: clamp(10px, 1.2vh, 12px); height: clamp(10px, 1.2vh, 12px); border-radius:3px; flex:none; display:inline-block; }
       .legend .l-more{ color:var(--text-lo); font-size: clamp(9px, 1.05vh, 11px); }
 
       @media (max-width: 620px){
@@ -1656,9 +1692,10 @@ function usageWebviewHtml(profileLabel: string): string {
       <div class="topbar">
         <div class="brand">
           <div class="mark">OC</div>
-          <div class="name" id="brandName">${escapeHtml(profileLabel)} — Usage</div>
+          <div class="name" id="brandName">${escapeHtml(profileLabel)}</div>
         </div>
         <div class="actions">
+          <button class="btn" id="btnWindow" title="Switch the chart window: week / 14 days / month / lifetime">14 days</button>
           <button class="btn" id="btnTargets" title="Set manual spent targets for Session / Weekly / Monthly">Set targets</button>
           <button class="btn" id="btnRename" title="Rename the active profile" style="display:none">Rename</button>
           <button class="btn primary" id="btnRefresh" title="Refresh usage data now">Refresh</button>
@@ -1674,6 +1711,8 @@ function usageWebviewHtml(profileLabel: string): string {
             <button class="tab-btn" data-metric="requests"><span class="sw" style="background:var(--blue)"></span>Requests</button>
             <button class="tab-btn" data-metric="tokens"><span class="sw" style="background:var(--teal)"></span>Tokens</button>
             <button class="tab-btn" data-metric="models"><span class="sw" style="background:var(--coral)"></span>By model</button>
+            <button class="tab-btn" data-metric="suggested"><span class="sw" style="background:var(--violet)"></span>Suggested</button>
+            <button class="tab-btn" data-metric="approved"><span class="sw" style="background:#7fd1a8"></span>Approved</button>
           </div>
           <div class="stat-chips" id="statChips"></div>
         </div>
@@ -1745,12 +1784,24 @@ function usageWebviewHtml(profileLabel: string): string {
           return '$' + String(Math.round(v * 100) / 100);
         }
         function metricValues(m) {
-          return DATA.days.map(function (d) { return m === 'spend' ? d.cost : m === 'requests' ? d.requests : d.tokens; });
+          if (m === 'spend') return DATA.days.map(function (d) { return d.cost; });
+          if (m === 'requests') return DATA.days.map(function (d) { return d.requests; });
+          if (m === 'tokens') return DATA.days.map(function (d) { return d.tokens; });
+          return DATA.completions.map(function (d) { return m === 'suggested' ? d.suggested : d.approved; });
         }
         function metricFmt(m) {
-          return m === 'spend' ? fmtUsd : m === 'requests' ? fmtCount : fmtTokens;
+          if (m === 'spend') return fmtUsd;
+          return fmtCount;
+        }
+        function metricUnit(m) {
+          if (m === 'spend') return '';
+          if (m === 'requests') return ' requests';
+          if (m === 'tokens') return ' tokens';
+          return m === 'suggested' ? ' suggestions' : ' approvals';
+        }
+        function metricColor(m) {
+          return m === 'spend' ? '#e3b341' : m === 'requests' ? '#5aa9ff' : m === 'tokens' ? '#3fdbb0' : m === 'suggested' ? '#a98ef9' : '#7fd1a8';
         }
-        function metricUnit(m) { return m === 'spend' ? '' : m === 'requests' ? ' requests' : ' tokens'; }
         function metricTotal(m) {
           var vals = metricValues(m);
           return vals.reduce(function (a, b) { return a + b; }, 0);
@@ -1778,7 +1829,7 @@ function usageWebviewHtml(profileLabel: string): string {
           var maxVal = niceMax(Math.max.apply(null, vals) * 1.15);
           var axis = axisTicks(maxVal, 4);
           maxVal = axis.top;
-          var color = m === 'spend' ? '#e3b341' : m === 'requests' ? '#5aa9ff' : '#3fdbb0';
+          var color = metricColor(m);
           var fmt = metricFmt(m), unit = metricUnit(m);
           var fmtAxis = m === 'spend' ? fmtAxisUsd : fmt;
           var n = DATA.days.length;
@@ -1814,22 +1865,24 @@ function usageWebviewHtml(profileLabel: string): string {
           svg.appendChild(el('path', { d: areaD, fill: 'url(#grad)', stroke: 'none' }));
           svg.appendChild(el('path', { d: pathD, fill: 'none', stroke: color, 'stroke-width': '2', 'stroke-linejoin': 'round', 'stroke-linecap': 'round' }));
 
-          // cursor-follow nearest-day tooltip + visible dots
-          var hits = points.map(function (p, i) {
-            var c = el('circle', { cx: p.x, cy: p.y, r: '10', fill: 'transparent', stroke: 'none' });
-            c.addEventListener('mousemove', function (ev) { showDay(ev, p, i); });
-            c.addEventListener('mouseleave', hideTooltip);
-            svg.appendChild(c);
-            return c;
-          });
-          function showDay(ev, p, i) {
-            svg.querySelectorAll('.dot').forEach(function (d) { d.remove(); });
-            svg.appendChild(el('circle', { 'class': 'dot', cx: p.x, cy: p.y, r: '3.5', fill: color, stroke: '#161a20', 'stroke-width': '2' }));
+          // whole-chart hover: nearest day gets a guide line, dot and tooltip
+          var guide = el('line', { y1: padT, y2: padT + plotH, stroke: 'rgba(255,255,255,0.18)', 'stroke-width': '1', 'stroke-dasharray': '3 3' });
+          var dot = el('circle', { r: '3.5', fill: color, stroke: '#161a20', 'stroke-width': '2' });
+          var overlay = el('rect', { x: padL, y: padT, width: plotW, height: plotH, fill: 'transparent' });
+          overlay.addEventListener('mousemove', function (ev) {
+            var r = svg.getBoundingClientRect();
+            var px = ev.clientX - r.left;
+            var best = points[0], bd = Infinity;
+            points.forEach(function (p) { var d = Math.abs(p.x - px); if (d < bd) { bd = d; best = p; } });
+            guide.setAttribute('x1', String(best.x)); guide.setAttribute('x2', String(best.x));
+            dot.setAttribute('cx', String(best.x)); dot.setAttribute('cy', String(best.y));
+            svg.appendChild(guide); svg.appendChild(dot);
             showTooltip(ev.clientX, ev.clientY,
-              '<span class="t-line">' + dayLabel(p.day.dayStart) + '</span><b>' + fmt(p.v) + '</b>' + unit +
-              '<div class="t-sub">' + fmtCount(p.day.tokens) + ' tokens · ' + fmtCount(p.day.requests) + ' requests</div>');
-          }
-          void hits;
+              '<span class="t-line">' + dayLabel(best.day.dayStart) + '</span><b>' + fmt(best.v) + '</b>' + unit +
+              '<div class="t-sub">' + fmtCount(best.day.tokens) + ' tokens · ' + fmtCount(best.day.requests) + ' requests</div>');
+          });
+          overlay.addEventListener('mouseleave', function () { guide.remove(); dot.remove(); hideTooltip(); });
+          svg.appendChild(overlay);
           svg.appendChild(el('line', { x1: padL, y1: padT + plotH, x2: W - padR, y2: padT + plotH, stroke: '#242a33', 'stroke-width': '1' }));
         }
 
@@ -1848,7 +1901,7 @@ function usageWebviewHtml(profileLabel: string): string {
           });
           var models = Object.keys(totals).sort(function (a, b) { return totals[b] - totals[a]; });
           if (models.length === 0) {
-            svg.appendChild(el('text', { x: W / 2, y: H / 2, 'text-anchor': 'middle', fill: '#5b6472', 'font-size': '11' }, 'No usage in the last ' + DATA.windowDays + ' days'));
+            svg.appendChild(el('text', { x: W / 2, y: H / 2, 'text-anchor': 'middle', fill: '#5b6472', 'font-size': '11' }, 'No model usage in the selected window'));
             return;
           }
 
@@ -1906,6 +1959,50 @@ function usageWebviewHtml(profileLabel: string): string {
 
           svg.appendChild(el('line', { x1: padL, y1: padT + plotH, x2: W - padR, y2: padT + plotH, stroke: '#242a33', 'stroke-width': '1' }));
 
+          // whole-chart hover: nearest day highlights every model's point and
+          // lists each model's spend for that day
+          var guide2 = el('line', { y1: padT, y2: padT + plotH, stroke: 'rgba(255,255,255,0.18)', 'stroke-width': '1', 'stroke-dasharray': '3 3' });
+          var dots2 = [];
+          var overlay2 = el('rect', { x: padL, y: padT, width: plotW, height: plotH, fill: 'transparent' });
+          var modelPts = [];
+          series.forEach(function (s, si) {
+            var color2 = MODEL_COLORS[si % MODEL_COLORS.length];
+            s.values.forEach(function (p, i) {
+              modelPts.push({
+                x: padL + step * i,
+                y: padT + plotH - (p.cost / maxVal) * plotH,
+                model: s.model,
+                color: color2,
+                p: p,
+                i: i
+              });
+            });
+          });
+          overlay2.addEventListener('mousemove', function (ev) {
+            var r = svg.getBoundingClientRect();
+            var px = ev.clientX - r.left;
+            var best = null, bd = Infinity;
+            modelPts.forEach(function (pt) { var d = Math.abs(pt.x - px); if (d < bd) { bd = d; best = pt; } });
+            if (!best) return;
+            guide2.setAttribute('x1', String(best.x)); guide2.setAttribute('x2', String(best.x));
+            svg.appendChild(guide2);
+            dots2.forEach(function (d2) { d2.remove(); });
+            dots2.length = 0;
+            var lines2 = [];
+            modelPts.forEach(function (pt) {
+              if (pt.i !== best.i) return;
+              var dd = el('circle', { cx: pt.x, cy: pt.y, r: '3.5', fill: pt.color, stroke: '#161a20', 'stroke-width': '2' });
+              svg.appendChild(dd);
+              dots2.push(dd);
+              if (pt.p.cost > 0) lines2.push('<div class="t-sub"><span class="l-swatch" style="background:' + pt.color + ';display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:5px"></span>' + pt.model + ': <b>' + fmtUsd(pt.p.cost) + '</b></div>');
+            });
+            showTooltip(ev.clientX, ev.clientY,
+              '<span class="t-line">' + dayLabel(best.p.dayStart) + '</span>' +
+              (lines2.length ? lines2.join('') : '<span class="t-sub">No model spend this day</span>'));
+          });
+          overlay2.addEventListener('mouseleave', function () { guide2.remove(); dots2.forEach(function (d2) { d2.remove(); }); dots2.length = 0; hideTooltip(); });
+          svg.appendChild(overlay2);
+
           // legend (up to 8 models, ranked by total spend)
           var legend = document.getElementById('legend');
           legend.innerHTML = series.slice(0, 8).map(function (s, i) {
@@ -1919,12 +2016,24 @@ function usageWebviewHtml(profileLabel: string): string {
           var fmt = metricFmt(key), unit = metricUnit(key);
           if (key === 'models') {
             chips.innerHTML =
-              '<div class="stat-chip"><div class="k">Total spend</div><div class="v">' + fmtUsd(metricTotal('spend')) + '</div></div>' +
-              '<div class="stat-chip"><div class="k">Window</div><div class="v">' + DATA.windowDays + ' days</div></div>';
+              '<div class="stat-chip"><div class="k">Total spend</div><div class="v">' + fmtUsd(metricTotal('spend')) + '</div></div>';
             drawModelLines();
             return;
           }
           document.getElementById('legend').innerHTML = '';
+          if (key === 'suggested' || key === 'approved') {
+            var comp = DATA.completions;
+            var last = comp.length ? comp[comp.length - 1] : { suggested: 0, approved: 0 };
+            var prev = comp.length > 1 ? comp[comp.length - 2] : { suggested: 0, approved: 0 };
+            var total = 0;
+            comp.forEach(function (d) { total += key === 'suggested' ? d.suggested : d.approved; });
+            chips.innerHTML =
+              '<div class="stat-chip"><div class="k">Today</div><div class="v">' + fmtCount(key === 'suggested' ? last.suggested : last.approved) + '</div></div>' +
+              '<div class="stat-chip"><div class="k">Yesterday</div><div class="v">' + fmtCount(key === 'suggested' ? prev.suggested : prev.approved) + '</div></div>' +
+              '<div class="stat-chip"><div class="k">Total ' + key + '</div><div class="v">' + fmtCount(total) + '</div></div>';
+            drawLine(key);
+            return;
+          }
           var st = DATA.stats;
           var totalKey = key === 'spend' ? 'total' : key;
           chips.innerHTML =
@@ -1988,13 +2097,37 @@ function usageWebviewHtml(profileLabel: string): string {
           var msg = ev.data;
           if (!msg || msg.type !== 'usage') return;
           DATA = msg.data;
-          document.getElementById('brandName').textContent = DATA.profile + ' \u2014 Usage';
+          document.getElementById('brandName').textContent = DATA.profile;
           document.getElementById('btnRename').style.display = DATA.showRename ? '' : 'none';
+          windowBtn.textContent = windowLabel(DATA.windowDays);
           refreshBtn.textContent = 'Refresh';
           renderRings();
           render(current);
         });
 
+        document.getElementById('brandName').textContent = DATA.profile;
+
+        // window toggle: week -> 14 days -> month -> lifetime
+        var WINDOWS = [
+          { days: 7, label: 'Week' },
+          { days: 14, label: '14 days' },
+          { days: 30, label: 'Month' },
+          { days: 0, label: 'Lifetime' }
+        ];
+        function windowLabel(days) {
+          for (var i = 0; i < WINDOWS.length; i++) if (WINDOWS[i].days === days) return WINDOWS[i].label;
+          return days + ' days';
+        }
+        var windowBtn = document.getElementById('btnWindow');
+        windowBtn.textContent = windowLabel(DATA.windowDays);
+        windowBtn.addEventListener('click', function () {
+          var idx = 0;
+          for (var i = 0; i < WINDOWS.length; i++) if (WINDOWS[i].days === DATA.windowDays) idx = i;
+          var next = WINDOWS[(idx + 1) % WINDOWS.length];
+          windowBtn.textContent = next.label;
+          vscode.postMessage({ type: 'window', days: next.days });
+        });
+
         renderRings();
         render('spend');
       })();
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index bf52e55..edad637 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -421,9 +421,23 @@ export function buildUsageSeries(
   dayStartMs: number,
   source: UsageTodayYesterdaySource = "auto",
 ): UsageSeries {
-  const dayCount = Math.max(1, Math.floor(days));
-  const firstDay = dayStartMs - (dayCount - 1) * DAY_MS;
-  const buckets: UsageDayPoint[] = Array.from({ length: dayCount }, (_, i) => ({
+  // days > 0: the last `days` days ending at dayStartMs; days <= 0: lifetime
+  // from the earliest recorded usage to today (aligned to the day grid).
+  let firstDay: number;
+  if (days > 0) {
+    firstDay = dayStartMs - (Math.max(1, Math.floor(days)) - 1) * DAY_MS;
+  } else {
+    let earliest = dayStartMs;
+    if (source !== "extension") {
+      for (const row of rows) if (row.createdMs < earliest) earliest = row.createdMs;
+    }
+    if (source !== "cli") {
+      for (const entry of entries) if (entry.timestamp < earliest) earliest = entry.timestamp;
+    }
+    firstDay = dayStartMs - Math.ceil((dayStartMs - earliest) / DAY_MS) * DAY_MS;
+  }
+  const bucketCount = Math.round((dayStartMs - firstDay) / DAY_MS) + 1;
+  const buckets: UsageDayPoint[] = Array.from({ length: bucketCount }, (_, i) => ({
     dayStart: firstDay + i * DAY_MS,
     cost: 0,
     tokens: 0,
@@ -432,8 +446,8 @@ export function buildUsageSeries(
   const byModel = new Map<string, Map<number, ModelDayUsage>>();
 
   const add = (model: string | undefined, timestamp: number, cost: number, tokens: number): void => {
-    const index = Math.floor((timestamp - firstDay) / DAY_MS);
-    if (index < 0 || index >= dayCount) return;
+    const index = Math.round((timestamp - firstDay) / DAY_MS);
+    if (index < 0 || index >= bucketCount) return;
     const day = buckets[index];
     day.cost += cost;
     day.tokens += tokens;
diff --git a/src/test/autocompleteUsage.test.ts b/src/test/autocompleteUsage.test.ts
new file mode 100644
index 0000000..a430ce9
--- /dev/null
+++ b/src/test/autocompleteUsage.test.ts
@@ -0,0 +1,59 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { bumpCompletionUsage, completionUsageToSeries, utcDayStart, type CompletionUsageDay } from "../autocomplete/usage.js";
+
+const DAY = 24 * 60 * 60 * 1000;
+
+describe("autocomplete usage — bumpCompletionUsage", () => {
+  it("increments the right counter for an existing day", () => {
+    const days: CompletionUsageDay[] = [{ dayStart: 1000, suggested: 2, approved: 1 }];
+    bumpCompletionUsage(days, 1000, "suggested");
+    bumpCompletionUsage(days, 1000, "approved");
+    assert.deepEqual(days, [{ dayStart: 1000, suggested: 3, approved: 2 }]);
+  });
+
+  it("creates a day entry on first use and caps retention", () => {
+    const days: CompletionUsageDay[] = [];
+    bumpCompletionUsage(days, 500, "suggested", 2);
+    assert.equal(days.length, 1);
+    bumpCompletionUsage(days, 1000, "suggested", 2);
+    bumpCompletionUsage(days, 1500, "suggested", 2);
+    assert.equal(days.length, 2, "oldest day evicted past the cap");
+    assert.equal(days[0].dayStart, 1000);
+  });
+});
+
+describe("autocomplete usage — completionUsageToSeries", () => {
+  const dayMs = utcDayStart(Date.now());
+
+  it("emits fixed windows with zero-filled days", () => {
+    const days: CompletionUsageDay[] = [
+      { dayStart: dayMs, suggested: 3, approved: 1 },
+      { dayStart: dayMs - DAY, suggested: 5, approved: 2 },
+    ];
+    const series = completionUsageToSeries(days, dayMs, 7);
+    assert.equal(series.length, 7);
+    assert.equal(series[6].suggested, 3);
+    assert.equal(series[6].approved, 1);
+    assert.equal(series[5].suggested, 5);
+    assert.equal(series[0].suggested, 0, "empty days are zero-filled");
+  });
+
+  it("lifetime windows span from the earliest stored day", () => {
+    const days: CompletionUsageDay[] = [
+      { dayStart: dayMs - 5 * DAY, suggested: 1, approved: 0 },
+      { dayStart: dayMs, suggested: 4, approved: 2 },
+    ];
+    const series = completionUsageToSeries(days, dayMs, 0);
+    assert.equal(series.length, 6);
+    assert.equal(series[0].suggested, 1);
+    assert.equal(series[5].suggested, 4);
+  });
+
+  it("empty history still yields a single today bucket", () => {
+    const series = completionUsageToSeries([], dayMs, 0);
+    assert.equal(series.length, 1);
+    assert.equal(series[0].dayStart, dayMs);
+    assert.equal(series[0].suggested, 0);
+  });
+});
diff --git a/src/test/goUsageTracker.test.ts b/src/test/goUsageTracker.test.ts
index de0aca4..287d606 100644
--- a/src/test/goUsageTracker.test.ts
+++ b/src/test/goUsageTracker.test.ts
@@ -824,4 +824,14 @@ describe("buildUsageSeries", () => {
     const series = buildUsageSeries(rows, entries, 14, dayMs, "cli");
     assert.ok(!series.byModel.some((p) => p.model === "glm-5"));
   });
+
+  it("lifetime windows (days=0) span from the earliest usage day", () => {
+    const series = buildUsageSeries(rows, entries, 0, dayMs, "auto");
+    // earliest row = dayMs - DAY → 2 buckets: yesterday + today
+    assert.equal(series.days.length, 2);
+    assert.equal(series.days[0].dayStart, dayMs - DAY);
+    assert.equal(series.days[1].dayStart, dayMs);
+    assert.equal(series.days[0].requests, 2);
+    assert.equal(series.days[1].requests, 2);
+  });
 });

From 486d092e6f356046912b4dbdde842f93f964cb30 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 12:30:16 +0500
Subject: [PATCH 34/43] feat(usage): lifetime default, Suggestions/Approved
 fixes

- Default chart window is now Lifetime (usageChartDays default 0).
- 'By model' tab renamed to 'Models'; 'Suggested' to 'Suggestions'.
- Suggestions/Approved tabs show no stat chips on the right.
- Charts use whole-number axes for suggestion/approval counts (never 2.5).
- Hover on the completion tabs shows that day's suggestion/approval counts
  instead of the chat token/request totals.
- Fixes the 'undefined suggestions' hover bug: the completion series now
  shares the exact day buckets of the usage series (explicit first-day
  alignment) with zero-filling, so every hover point has a value.
---
 CHANGELOG.md                       |  2 +-
 package.json                       |  2 +-
 src/autocomplete/usage.ts          |  7 ++++-
 src/config.ts                      |  2 +-
 src/extension.ts                   | 46 +++++++++++++++++++-----------
 src/test/autocompleteUsage.test.ts | 13 +++++++++
 6 files changed, 52 insertions(+), 20 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a866168..2df56c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
-- **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the By-model tab the tooltip lists every model's spend for that day. Two new tabs — **Suggested** and **Approved** — chart inline chat completions (suggestions shown by the provider and acceptances tracked via the guarded `onDidChangeInlineCompletionItems` API, persisted per day). A **Window** button (alongside Set targets / Rename / Refresh) cycles Week → 14 days → Month → Lifetime and re-renders every chart for the new window (lifetime spans the earliest recorded usage). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
+- **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the Models tab the tooltip lists every model's spend for that day. Two new tabs — **Suggestions** and **Approved** — chart inline chat completions with whole-number axes and honest tooltips (the day's suggestion/approval counts, not chat token totals); both series share the exact same day buckets, so hovers never resolve to undefined. The default chart window is **Lifetime**, switchable live via the **Window** button (Week → 14 days → Month → Lifetime). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
 
 - **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
 
diff --git a/package.json b/package.json
index 4171984..b228d1c 100644
--- a/package.json
+++ b/package.json
@@ -179,7 +179,7 @@
         },
         "opencodego.usageChartDays": {
           "type": "number",
-          "default": 14,
+          "default": 0,
           "minimum": 0,
           "maximum": 370,
           "description": "How many days the usage panel charts cover (daily spend / requests / tokens, per-model and chat-completion breakdowns). 0 = lifetime. The panel's Window button toggles this live (Week / 14 days / Month / Lifetime)."
diff --git a/src/autocomplete/usage.ts b/src/autocomplete/usage.ts
index 7a646ee..585fe00 100644
--- a/src/autocomplete/usage.ts
+++ b/src/autocomplete/usage.ts
@@ -48,10 +48,15 @@ export function completionUsageToSeries(
   days: CompletionUsageDay[],
   dayStartMs: number,
   windowDays: number,
+  firstDayOverride?: number,
 ): { dayStart: number; suggested: number; approved: number }[] {
   const byDay = new Map(days.map((d) => [d.dayStart, d]));
   let firstDay: number;
-  if (windowDays > 0) {
+  if (firstDayOverride !== undefined) {
+    // Align with the usage chart's own day range (both series must share the
+    // exact same buckets, otherwise hover values go undefined).
+    firstDay = firstDayOverride;
+  } else if (windowDays > 0) {
     firstDay = dayStartMs - (Math.max(1, Math.floor(windowDays)) - 1) * DAY_MS;
   } else if (days.length > 0) {
     const earliest = Math.min(...days.map((d) => d.dayStart));
diff --git a/src/config.ts b/src/config.ts
index 356580c..f0ca714 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -186,7 +186,7 @@ export const SETTING_USAGE_REFRESH_INTERVAL_SECONDS = "usageRefreshIntervalSecon
 export const DEFAULT_USAGE_REFRESH_INTERVAL_SECONDS = 60;
 /** How many days the usage panel charts cover (0 = lifetime). */
 export const SETTING_USAGE_CHART_DAYS = "usageChartDays";
-export const DEFAULT_USAGE_CHART_DAYS = 14;
+export const DEFAULT_USAGE_CHART_DAYS = 0;
 /** globalState key for the per-day chat-completion usage counters. */
 export const COMPLETION_USAGE_KEY = "opencodego.completionUsage.v1";
 /** How many days of completion history are retained. */
diff --git a/src/extension.ts b/src/extension.ts
index d887842..953d73d 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1477,7 +1477,15 @@ function usageWebviewData(): Record<string, unknown> | undefined {
   const windowDays = usageChartWindowDays;
   const series = tracker.getUsageSeries(windowDays);
   const completionDays = contextCompletionUsage();
-  const completions = completionUsageToSeries(completionDays, trackerDayStart(tracker), windowDays);
+  // The completion series must share the EXACT day buckets of the usage
+  // series (they can differ in length on lifetime windows), otherwise the
+  // charts misalign and hovers resolve to undefined values.
+  const completions = completionUsageToSeries(
+    completionDays,
+    trackerDayStart(tracker),
+    windowDays,
+    series.days.length > 0 ? series.days[0].dayStart : undefined,
+  );
   const activeProfile = findProfile(profilesCache, activeProfileFingerprint);
   const showRolling = usageRollingMeterVisible();
 
@@ -1710,8 +1718,8 @@ function usageWebviewHtml(profileLabel: string): string {
             <button class="tab-btn active" data-metric="spend"><span class="sw" style="background:var(--amber)"></span>Spend</button>
             <button class="tab-btn" data-metric="requests"><span class="sw" style="background:var(--blue)"></span>Requests</button>
             <button class="tab-btn" data-metric="tokens"><span class="sw" style="background:var(--teal)"></span>Tokens</button>
-            <button class="tab-btn" data-metric="models"><span class="sw" style="background:var(--coral)"></span>By model</button>
-            <button class="tab-btn" data-metric="suggested"><span class="sw" style="background:var(--violet)"></span>Suggested</button>
+            <button class="tab-btn" data-metric="models"><span class="sw" style="background:var(--coral)"></span>Models</button>
+            <button class="tab-btn" data-metric="suggested"><span class="sw" style="background:var(--violet)"></span>Suggestions</button>
             <button class="tab-btn" data-metric="approved"><span class="sw" style="background:#7fd1a8"></span>Approved</button>
           </div>
           <div class="stat-chips" id="statChips"></div>
@@ -1772,8 +1780,10 @@ function usageWebviewHtml(profileLabel: string): string {
           return cand * mag;
         }
         // Round the max up to a multiple of a round step, then emit 0..top ticks.
-        function axisTicks(maxVal, bands) {
+        // forceInt keeps counts whole (suggestions/approvals never show 2.5).
+        function axisTicks(maxVal, bands, forceInt) {
           var step = niceStep(maxVal / Math.max(1, bands));
+          if (forceInt) step = Math.max(1, Math.round(step));
           var top = Math.ceil(maxVal / step) * step;
           var ticks = [];
           for (var v = top; v > -1e-9; v -= step) ticks.push(Math.round(v * 10000) / 10000);
@@ -1787,7 +1797,10 @@ function usageWebviewHtml(profileLabel: string): string {
           if (m === 'spend') return DATA.days.map(function (d) { return d.cost; });
           if (m === 'requests') return DATA.days.map(function (d) { return d.requests; });
           if (m === 'tokens') return DATA.days.map(function (d) { return d.tokens; });
-          return DATA.completions.map(function (d) { return m === 'suggested' ? d.suggested : d.approved; });
+          var vals = (DATA.completions || []).map(function (d) { return m === 'suggested' ? d.suggested : d.approved; });
+          // zero-fill so every day bucket has a value (lifetime ranges differ)
+          while (vals.length < DATA.days.length) vals.push(0);
+          return vals;
         }
         function metricFmt(m) {
           if (m === 'spend') return fmtUsd;
@@ -1827,11 +1840,20 @@ function usageWebviewHtml(profileLabel: string): string {
           var plotW = Math.max(1, W - padL - padR), plotH = Math.max(1, H - padT - padB);
           var vals = metricValues(m);
           var maxVal = niceMax(Math.max.apply(null, vals) * 1.15);
-          var axis = axisTicks(maxVal, 4);
+          var isCount = m === 'suggested' || m === 'approved';
+          var axis = axisTicks(maxVal, 4, isCount);
           maxVal = axis.top;
           var color = metricColor(m);
           var fmt = metricFmt(m), unit = metricUnit(m);
           var fmtAxis = m === 'spend' ? fmtAxisUsd : fmt;
+          function daySub(day) {
+            if (isCount) {
+              var c = { suggested: 0, approved: 0 };
+              (DATA.completions || []).forEach(function (d) { if (d.dayStart === day.dayStart) c = d; });
+              return fmtCount(c.suggested) + ' suggestions · ' + fmtCount(c.approved) + ' approved';
+            }
+            return fmtCount(day.tokens) + ' tokens · ' + fmtCount(day.requests) + ' requests';
+          }
           var n = DATA.days.length;
 
           var defs = el('defs', {});
@@ -1879,7 +1901,7 @@ function usageWebviewHtml(profileLabel: string): string {
             svg.appendChild(guide); svg.appendChild(dot);
             showTooltip(ev.clientX, ev.clientY,
               '<span class="t-line">' + dayLabel(best.day.dayStart) + '</span><b>' + fmt(best.v) + '</b>' + unit +
-              '<div class="t-sub">' + fmtCount(best.day.tokens) + ' tokens · ' + fmtCount(best.day.requests) + ' requests</div>');
+              '<div class="t-sub">' + daySub(best.day) + '</div>');
           });
           overlay.addEventListener('mouseleave', function () { guide.remove(); dot.remove(); hideTooltip(); });
           svg.appendChild(overlay);
@@ -2022,15 +2044,7 @@ function usageWebviewHtml(profileLabel: string): string {
           }
           document.getElementById('legend').innerHTML = '';
           if (key === 'suggested' || key === 'approved') {
-            var comp = DATA.completions;
-            var last = comp.length ? comp[comp.length - 1] : { suggested: 0, approved: 0 };
-            var prev = comp.length > 1 ? comp[comp.length - 2] : { suggested: 0, approved: 0 };
-            var total = 0;
-            comp.forEach(function (d) { total += key === 'suggested' ? d.suggested : d.approved; });
-            chips.innerHTML =
-              '<div class="stat-chip"><div class="k">Today</div><div class="v">' + fmtCount(key === 'suggested' ? last.suggested : last.approved) + '</div></div>' +
-              '<div class="stat-chip"><div class="k">Yesterday</div><div class="v">' + fmtCount(key === 'suggested' ? prev.suggested : prev.approved) + '</div></div>' +
-              '<div class="stat-chip"><div class="k">Total ' + key + '</div><div class="v">' + fmtCount(total) + '</div></div>';
+            chips.innerHTML = '';
             drawLine(key);
             return;
           }
diff --git a/src/test/autocompleteUsage.test.ts b/src/test/autocompleteUsage.test.ts
index a430ce9..9ebd025 100644
--- a/src/test/autocompleteUsage.test.ts
+++ b/src/test/autocompleteUsage.test.ts
@@ -56,4 +56,17 @@ describe("autocomplete usage — completionUsageToSeries", () => {
     assert.equal(series[0].dayStart, dayMs);
     assert.equal(series[0].suggested, 0);
   });
+
+  it("honors an explicit first day so both charts share buckets", () => {
+    const days: CompletionUsageDay[] = [{ dayStart: dayMs, suggested: 2, approved: 1 }];
+    // The usage series may start earlier (e.g. 5 days back on lifetime);
+    // the completion series must span the same range with zero-fills.
+    const first = dayMs - 5 * DAY;
+    const series = completionUsageToSeries(days, dayMs, 0, first);
+    assert.equal(series.length, 6);
+    assert.equal(series[0].dayStart, first);
+    assert.equal(series[5].dayStart, dayMs);
+    assert.equal(series[5].suggested, 2);
+    assert.equal(series[0].suggested, 0);
+  });
 });

From 46bc8ec27f78ab98864094ba18d3918386fd8bf2 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 12:37:53 +0500
Subject: [PATCH 35/43] fix(usage): track approved completions via insert
 heuristic
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

VS Code's stable API has NO inline-completion acceptance event — the
previously guarded onDidChangeInlineCompletionItems does not exist, so
approvals were always 0. Committing a ghost text is now detected from the
document insert: it must start exactly at the suggested position and match
the suggested text (multi-character, 30s window, cleared on first match).
Pure matcher matchesAcceptance() extracted and unit-tested (275 tests).
---
 CHANGELOG.md                       |  2 +-
 src/autocomplete/index.ts          | 47 +++++++++++++++++++-----------
 src/autocomplete/provider.ts       |  4 +--
 src/autocomplete/usage.ts          | 15 ++++++++++
 src/test/autocompleteUsage.test.ts | 26 ++++++++++++++++-
 5 files changed, 73 insertions(+), 21 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2df56c8..f20d8cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
-- **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the Models tab the tooltip lists every model's spend for that day. Two new tabs — **Suggestions** and **Approved** — chart inline chat completions with whole-number axes and honest tooltips (the day's suggestion/approval counts, not chat token totals); both series share the exact same day buckets, so hovers never resolve to undefined. The default chart window is **Lifetime**, switchable live via the **Window** button (Week → 14 days → Month → Lifetime). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
+- **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the Models tab the tooltip lists every model's spend for that day. Two new tabs — **Suggestions** and **Approved** — chart inline chat completions with whole-number axes and honest tooltips (the day's suggestion/approval counts, not chat token totals); both series share the exact same day buckets, so hovers never resolve to undefined. Acceptances are detected with a bounded heuristic: VS Code's stable API exposes no inline-completion acceptance event, so committing a ghost text is recognized by the document insert starting exactly at the suggested position with a matching multi-character text (30s window, cleared on first match — see `matchesAcceptance`). The default chart window is **Lifetime**, switchable live via the **Window** button (Week → 14 days → Month → Lifetime). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
 
 - **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
 
diff --git a/src/autocomplete/index.ts b/src/autocomplete/index.ts
index d2f6b96..13b9a9b 100644
--- a/src/autocomplete/index.ts
+++ b/src/autocomplete/index.ts
@@ -30,7 +30,7 @@ import {
   INLINE_TIMEOUT_MS_SETTING,
 } from "../config";
 import { toFiniteNumber } from "../utils";
-import { bumpCompletionUsage, utcDayStart, type CompletionUsageDay } from "./usage";
+import { bumpCompletionUsage, matchesAcceptance, utcDayStart, type CompletionUsageDay } from "./usage";
 
 export {
   INLINE_SUGGESTIONS_SETTING,
@@ -82,23 +82,30 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
     void context.globalState.update(COMPLETION_USAGE_KEY, completionUsage);
   };
 
-  // Acceptance tracking: `onDidChangeInlineCompletionItems` is not in the
-  // stable API types, so it is guarded at runtime — on hosts that have it,
-  // `didAccept` reports when the user accepted a ghost-text suggestion.
-  const onDidChangeInlineCompletionItems = (
-    vscode.languages as unknown as {
-      onDidChangeInlineCompletionItems?: (listener: (event: { didAccept?: boolean }) => unknown) => vscode.Disposable;
-    }
-  ).onDidChangeInlineCompletionItems;
-  if (typeof onDidChangeInlineCompletionItems === "function") {
-    context.subscriptions.push(
-      onDidChangeInlineCompletionItems((event) => {
-        if (event.didAccept) {
+  // Acceptance tracking: VS Code's stable API exposes NO acceptance event
+  // for inline completions, so we detect the insert that committing a ghost
+  // text produces: it starts exactly at the suggested position and matches
+  // the suggested text. The pending suggestion expires after 30s and is
+  // cleared on the first match, bounding false positives.
+  const ACCEPTANCE_WINDOW_MS = 30_000;
+  let pendingSuggestion: { documentUri: string; position: vscode.Position; text: string; expiresAt: number } | undefined;
+  context.subscriptions.push(
+    vscode.workspace.onDidChangeTextDocument((event) => {
+      if (!pendingSuggestion) return;
+      if (Date.now() > pendingSuggestion.expiresAt) {
+        pendingSuggestion = undefined;
+        return;
+      }
+      if (event.document.uri.toString() !== pendingSuggestion.documentUri) return;
+      for (const change of event.contentChanges) {
+        if (change.range.start.isEqual(pendingSuggestion.position) && matchesAcceptance(change.text, pendingSuggestion.text)) {
           recordCompletion("approved");
+          pendingSuggestion = undefined;
+          return;
         }
-      }),
-    );
-  }
+      }
+    }),
+  );
 
   const engine: CompletionEngine = {
     id: "chat-completions",
@@ -124,8 +131,14 @@ export function registerInlineCompletions(context: vscode.ExtensionContext, deps
   const provider = new OpenCodeInlineCompletionProvider({
     engine,
     resolveApiKey: deps.resolveApiKey,
-    onSuggestion: () => {
+    onSuggestion: (text, position, document) => {
       recordCompletion("suggested");
+      pendingSuggestion = {
+        documentUri: document.uri.toString(),
+        position,
+        text,
+        expiresAt: Date.now() + ACCEPTANCE_WINDOW_MS,
+      };
     },
     isEnabled: () => readSetting(INLINE_SUGGESTIONS_SETTING, false),
     resolveModelId: () => readSetting(INLINE_SUGGESTIONS_MODEL_SETTING, DEFAULT_INLINE_MODEL),
diff --git a/src/autocomplete/provider.ts b/src/autocomplete/provider.ts
index 7119ee4..82b6382 100644
--- a/src/autocomplete/provider.ts
+++ b/src/autocomplete/provider.ts
@@ -16,7 +16,7 @@ export interface InlineCompletionProviderOptions {
   /** Resolve the API key (async; the caller owns caching/fallbacks). */
   resolveApiKey: () => Promise<string | undefined>;
   /** Called once when a ghost-text suggestion is actually returned to VS Code. */
-  onSuggestion?: () => void;
+  onSuggestion?: (text: string, position: vscode.Position, document: vscode.TextDocument) => void;
   /** Whether suggestions are currently enabled (config-driven). */
   isEnabled: () => boolean;
   /** The model to use for suggestions (config-driven). */
@@ -106,7 +106,7 @@ export class OpenCodeInlineCompletionProvider implements vscode.InlineCompletion
           return;
         }
         finish([new vscode.InlineCompletionItem(result.text, new vscode.Range(position, position))]);
-        this.options.onSuggestion?.();
+        this.options.onSuggestion?.(result.text, position, document);
       });
     });
   }
diff --git a/src/autocomplete/usage.ts b/src/autocomplete/usage.ts
index 585fe00..b280632 100644
--- a/src/autocomplete/usage.ts
+++ b/src/autocomplete/usage.ts
@@ -33,6 +33,21 @@ export function bumpCompletionUsage(
   return days;
 }
 
+/**
+ * Whether a document change counts as accepting a ghost-text suggestion.
+ * VS Code's stable API exposes no acceptance event, so we detect the insert
+ * that happens when a suggestion is committed: it starts exactly at the
+ * suggested position and the inserted text matches the suggestion.
+ *
+ * False positives are bounded by requiring a multi-character insert that
+ * matches the suggestion prefix/suffix — a single keystroke that happens to
+ * coincide is not counted.
+ */
+export function matchesAcceptance(changeText: string, pendingText: string): boolean {
+  if (changeText.length < 2 || !pendingText) return false;
+  return changeText.startsWith(pendingText) || pendingText.startsWith(changeText);
+}
+
 /** Start of the UTC day (the default chart boundary). */
 export function utcDayStart(nowMs: number): number {
   const d = new Date(nowMs);
diff --git a/src/test/autocompleteUsage.test.ts b/src/test/autocompleteUsage.test.ts
index 9ebd025..a911e75 100644
--- a/src/test/autocompleteUsage.test.ts
+++ b/src/test/autocompleteUsage.test.ts
@@ -1,6 +1,12 @@
 import { describe, it } from "node:test";
 import assert from "node:assert/strict";
-import { bumpCompletionUsage, completionUsageToSeries, utcDayStart, type CompletionUsageDay } from "../autocomplete/usage.js";
+import {
+  bumpCompletionUsage,
+  completionUsageToSeries,
+  matchesAcceptance,
+  utcDayStart,
+  type CompletionUsageDay,
+} from "../autocomplete/usage.js";
 
 const DAY = 24 * 60 * 60 * 1000;
 
@@ -70,3 +76,21 @@ describe("autocomplete usage — completionUsageToSeries", () => {
     assert.equal(series[0].suggested, 0);
   });
 });
+
+describe("autocomplete usage — matchesAcceptance", () => {
+  it("matches full and partial commits of the suggestion", () => {
+    assert.ok(matchesAcceptance("return true;", "return true;"));
+    assert.ok(matchesAcceptance("return tr", "return true;"), "partial typed commit");
+    assert.ok(matchesAcceptance("return true;\n}", "return true;"), "commit plus trailing text");
+  });
+
+  it("rejects single-keystroke edits (manual typing)", () => {
+    assert.ok(!matchesAcceptance("r", "return true;"));
+    assert.ok(!matchesAcceptance("", "return true;"));
+  });
+
+  it("rejects unrelated edits", () => {
+    assert.ok(!matchesAcceptance("something else", "return true;"));
+    assert.ok(!matchesAcceptance("RETURN TRUE;", "return true;"), "case differs");
+  });
+});

From aa5a0ac558ababab0194c658f30ddd0a6a8d246d Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 12:42:29 +0500
Subject: [PATCH 36/43] feat(usage): rename Suggestions tab to Suggested

---
 CHANGELOG.md     | 2 +-
 src/extension.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f20d8cf..6b7f6b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
-- **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the Models tab the tooltip lists every model's spend for that day. Two new tabs — **Suggestions** and **Approved** — chart inline chat completions with whole-number axes and honest tooltips (the day's suggestion/approval counts, not chat token totals); both series share the exact same day buckets, so hovers never resolve to undefined. Acceptances are detected with a bounded heuristic: VS Code's stable API exposes no inline-completion acceptance event, so committing a ghost text is recognized by the document insert starting exactly at the suggested position with a matching multi-character text (30s window, cleared on first match — see `matchesAcceptance`). The default chart window is **Lifetime**, switchable live via the **Window** button (Week → 14 days → Month → Lifetime). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
+- **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the Models tab the tooltip lists every model's spend for that day. Two new tabs — **Suggested** and **Approved** — chart inline chat completions with whole-number axes and honest tooltips (the day's suggestion/approval counts, not chat token totals); both series share the exact same day buckets, so hovers never resolve to undefined. Acceptances are detected with a bounded heuristic: VS Code's stable API exposes no inline-completion acceptance event, so committing a ghost text is recognized by the document insert starting exactly at the suggested position with a matching multi-character text (30s window, cleared on first match — see `matchesAcceptance`). The default chart window is **Lifetime**, switchable live via the **Window** button (Week → 14 days → Month → Lifetime). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
 
 - **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
 
diff --git a/src/extension.ts b/src/extension.ts
index 953d73d..d618c14 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1719,7 +1719,7 @@ function usageWebviewHtml(profileLabel: string): string {
             <button class="tab-btn" data-metric="requests"><span class="sw" style="background:var(--blue)"></span>Requests</button>
             <button class="tab-btn" data-metric="tokens"><span class="sw" style="background:var(--teal)"></span>Tokens</button>
             <button class="tab-btn" data-metric="models"><span class="sw" style="background:var(--coral)"></span>Models</button>
-            <button class="tab-btn" data-metric="suggested"><span class="sw" style="background:var(--violet)"></span>Suggestions</button>
+            <button class="tab-btn" data-metric="suggested"><span class="sw" style="background:var(--violet)"></span>Suggested</button>
             <button class="tab-btn" data-metric="approved"><span class="sw" style="background:#7fd1a8"></span>Approved</button>
           </div>
           <div class="stat-chips" id="statChips"></div>

From 12c46e4aa7df660cf71465934ae5142fc326fe25 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 12:45:12 +0500
Subject: [PATCH 37/43] feat(usage): rename the workspace row back to Codebase

The metric is scoped to the current workspace's all-time usage, so the
panel stat chip, quick-pick item and status-bar tooltip row all say
'Codebase' again (the Models-tab chip, which sums the whole selected
window, keeps the accurate 'Total spend' label).
---
 CHANGELOG.md     | 2 +-
 src/extension.ts | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b7f6b6..e4e1ad7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,7 +18,7 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 - **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the Models tab the tooltip lists every model's spend for that day. Two new tabs — **Suggested** and **Approved** — chart inline chat completions with whole-number axes and honest tooltips (the day's suggestion/approval counts, not chat token totals); both series share the exact same day buckets, so hovers never resolve to undefined. Acceptances are detected with a bounded heuristic: VS Code's stable API exposes no inline-completion acceptance event, so committing a ghost text is recognized by the document insert starting exactly at the suggested position with a matching multi-character text (30s window, cleared on first match — see `matchesAcceptance`). The default chart window is **Lifetime**, switchable live via the **Window** button (Week → 14 days → Month → Lifetime). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
 
-- **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Total spend, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is renamed to **Total spend** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
+- **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Codebase, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is labeled **Codebase** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
 
 - **`[Usage]` Realtime updates.** The status bar, tooltip and usage panel now refresh on a configurable background cadence (`opencodego.usageRefreshIntervalSeconds`, default 60s, min 5s), so terminal-side OpenCode CLI usage, server meters and midnight day rollovers appear without waiting for the next chat request. Changing any usage-view setting repaints the UI immediately, and the refresh interval itself applies live on the next tick.
 
diff --git a/src/extension.ts b/src/extension.ts
index d618c14..9fa9474 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -886,7 +886,7 @@ export function activate(context: vscode.ExtensionContext) {
       // history) — replaces the old "Latest Session (est)" estimate row.
       if (usageCodebaseRowVisible()) {
         const codebaseItem: vscode.QuickPickItem = {
-          label: "$(repo) Total spend",
+          label: "$(repo) Codebase",
           description: formatUsd(summary.codebase.cost),
           detail: `${formatTokenCount(summary.codebase.tokens)} tokens · ${formatCount(summary.codebase.requests)} requests`,
           alwaysShow: true,
@@ -1527,7 +1527,7 @@ function usageWebviewData(): Record<string, unknown> | undefined {
     completions,
     rings,
     stats: {
-      total: { label: "Total spend", cost: s.codebase.cost, tokens: s.codebase.tokens, requests: s.codebase.requests },
+      total: { label: "Codebase", cost: s.codebase.cost, tokens: s.codebase.tokens, requests: s.codebase.requests },
       today: { label: "Today", cost: s.today.cost, tokens: s.today.tokens, requests: s.today.requests },
       yesterday: { label: "Yesterday", cost: s.yesterday.cost, tokens: s.yesterday.tokens, requests: s.yesterday.requests },
     },
@@ -2349,7 +2349,7 @@ ${text(noDataMsg ?? "No usage data yet. Send a chat message to start tracking.",
   // stable regardless of whether a session is currently active.
   const deviceRows: Array<[string, number, number, number, number]> = [];
   if (usageCodebaseRowVisible()) {
-    deviceRows.push(["Total spend:", s.codebase.cost, s.codebase.requests, s.codebase.tokens, firstRowY]);
+    deviceRows.push(["Codebase:", s.codebase.cost, s.codebase.requests, s.codebase.tokens, firstRowY]);
   }
   const codebaseOffset = usageCodebaseRowVisible() ? 1 : 0;
   deviceRows.push(["Today:", s.today.cost, s.today.requests, s.today.tokens, firstRowY + codebaseOffset * rowGap]);

From 599b5d3a06663c6f0f40af696f5eea00ee917c98 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 13:00:16 +0500
Subject: [PATCH 38/43] fix(usage): harden CLI history reads + surface failures

The CLI history read silently failed in the extension host (today /
yesterday / codebase all showed 0 while the fetched quota worked). The read
is now resilient and observable:
- sqlite runs with .timeout 5000, a 10s spawn timeout and a 64MB maxBuffer
  (the full-history JSON can outgrow execFileSync's default 1MB cap),
- a second attempt retries transient busy/lock states,
- failures are logged with the exact error to the 'OpenCode Go Usage'
  output channel,
- activation logs a startup diagnostic line: 'CLI history available: ...'
  with today/codebase request counts, so a silent zero state is never
  mysterious again.
---
 src/extension.ts      | 13 +++++++
 src/goUsageTracker.ts | 84 +++++++++++++++++++++++++++----------------
 2 files changed, 67 insertions(+), 30 deletions(-)

diff --git a/src/extension.ts b/src/extension.ts
index 9fa9474..d853b00 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -825,6 +825,19 @@ export function activate(context: vscode.ExtensionContext) {
 
   ensureUsageStatusBar(context);
   ensureGoUsageStatusBar(context);
+  // Startup diagnostic: report whether the CLI history is readable so any
+  // silent zero-usage state is immediately visible in the usage output
+  // channel (the tracker also logs the exact failure reason on error).
+  {
+    const startupTracker = activeGoUsageTracker();
+    if (startupTracker) {
+      const startupSummary = startupTracker.getSummary();
+      goUsageLogChannel.appendLine(
+        `[go-usage] CLI history available: ${String(startupSummary.sqliteAvailable)} — ` +
+          `today=${String(startupSummary.today.requests)} req, codebase=${String(startupSummary.codebase.requests)} req`,
+      );
+    }
+  }
   // Pull the server-accurate account meters once at startup (TTL-guarded).
   void (async () => {
     const apiKey = await context.secrets.get(SECRET_KEY);
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index edad637..0ef8dd6 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -21,7 +21,7 @@ import {
   GO_SERVER_USAGE_KEY,
   type UsageTodayYesterdaySource,
 } from "./config";
-import { formatCount, formatTokenCount, formatUsd, formatRelativeTime } from "./utils";
+import { formatCount, formatTokenCount, formatUsd, formatRelativeTime, getErrorMessage } from "./utils";
 
 export { GO_LIMITS } from "./config";
 
@@ -493,6 +493,13 @@ export function buildUsageSeries(
  */
 const HISTORY_READ_TTL_MS = 3_000;
 let historyCache: { rows: HistoryRow[] | null; fetchedAt: number } | undefined;
+/** Surfaces CLI-history read failures in the usage output channel. */
+let historyReadDiagnostic: ((message: string) => void) | undefined;
+
+/** Wire the diagnostic sink (called once per tracker, last one wins). */
+export function setHistoryReadDiagnostic(log: (message: string) => void): void {
+  historyReadDiagnostic = log;
+}
 
 function readOpenCodeHistory(): HistoryRow[] | null {
   const now = Date.now();
@@ -505,37 +512,51 @@ function readOpenCodeHistory(): HistoryRow[] | null {
 }
 
 function readOpenCodeHistoryUncached(): HistoryRow[] | null {
-  if (!fs.existsSync(OPENCODE_DB_PATH)) return null;
-
-  try {
-    const result = execFileSync("sqlite3", ["-readonly", "-json", OPENCODE_DB_PATH, HISTORY_ROWS_SQL], {
-      timeout: 5000,
-      encoding: "utf-8",
-      stdio: ["pipe", "pipe", "pipe"],
-    });
-    const rows: unknown = JSON.parse(result);
-    if (!Array.isArray(rows)) return null;
-    return rows
-      .filter((row): row is HistoryRow => {
-        if (!row || typeof row !== "object") return false;
-        const candidate = row as Partial<HistoryRow>;
-        return (
-          typeof candidate.createdMs === "number" && candidate.createdMs > 0 && typeof candidate.cost === "number" && candidate.cost >= 0
-        );
-      })
-      .map((row) => ({
-        createdMs: row.createdMs,
-        cost: row.cost,
-        tokensInput: positiveNumberish(row.tokensInput),
-        tokensOutput: positiveNumberish(row.tokensOutput),
-        tokensReasoning: positiveNumberish(row.tokensReasoning),
-        tokensCacheRead: positiveNumberish(row.tokensCacheRead),
-        cwd: typeof row.cwd === "string" && row.cwd.trim() ? row.cwd : undefined,
-        modelId: typeof row.modelId === "string" && row.modelId.trim() ? row.modelId : undefined,
-      }));
-  } catch {
+  if (!fs.existsSync(OPENCODE_DB_PATH)) {
+    historyReadDiagnostic?.(`[go-usage] CLI history: database not found at ${OPENCODE_DB_PATH}`);
     return null;
   }
+
+  // Two attempts: transient busy/lock states (e.g. the CLI checkpointing a
+  // large WAL) resolve within the 5s sqlite busy-timeout.
+  for (let attempt = 0; attempt < 2; attempt++) {
+    try {
+      const result = execFileSync("sqlite3", ["-readonly", "-cmd", ".timeout 5000", "-json", OPENCODE_DB_PATH, HISTORY_ROWS_SQL], {
+        timeout: 10_000,
+        maxBuffer: 64 * 1024 * 1024,
+        encoding: "utf-8",
+        stdio: ["pipe", "pipe", "pipe"],
+      });
+      const rows: unknown = JSON.parse(result);
+      if (!Array.isArray(rows)) return null;
+      return rows
+        .filter((row): row is HistoryRow => {
+          if (!row || typeof row !== "object") return false;
+          const candidate = row as Partial<HistoryRow>;
+          return (
+            typeof candidate.createdMs === "number" && candidate.createdMs > 0 && typeof candidate.cost === "number" && candidate.cost >= 0
+          );
+        })
+        .map((row) => ({
+          createdMs: row.createdMs,
+          cost: row.cost,
+          tokensInput: positiveNumberish(row.tokensInput),
+          tokensOutput: positiveNumberish(row.tokensOutput),
+          tokensReasoning: positiveNumberish(row.tokensReasoning),
+          tokensCacheRead: positiveNumberish(row.tokensCacheRead),
+          cwd: typeof row.cwd === "string" && row.cwd.trim() ? row.cwd : undefined,
+          modelId: typeof row.modelId === "string" && row.modelId.trim() ? row.modelId : undefined,
+        }));
+    } catch (error) {
+      const message = getErrorMessage(error);
+      if (attempt === 0) {
+        historyReadDiagnostic?.(`[go-usage] CLI history read failed (attempt 1): ${message}. Retrying…`);
+      } else {
+        historyReadDiagnostic?.(`[go-usage] CLI history read failed: ${message}`);
+      }
+    }
+  }
+  return null;
 }
 
 // ─── Exported tracker class ──────────────────────────────────────────────────
@@ -576,6 +597,9 @@ export class GoUsageTracker {
   ) {
     this.log = log;
     this.costResolver = costResolver;
+    if (log) {
+      setHistoryReadDiagnostic(log);
+    }
     this.restore();
     // Fast startup: show the last successful server snapshot immediately
     // instead of 0s until the TTL-guarded refetch lands. `serverUsageFetchedAt`

From 40b424221f5fd1f6417f8d6815405273d5f16f34 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 13:20:15 +0500
Subject: [PATCH 39/43] fix(usage): read CLI history via node:sqlite, no binary
 dependency
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Root cause of the flaky zero-usage: 'sqlite3' resolves to the Android SDK
binary (~/Android/Sdk/platform-tools/sqlite3), which is only on PATH when
VS Code launches from a shell that exports it — desktop-launched windows
got ENOENT and silently showed 0 for Today/Yesterday/Codebase.

The history is now read through Node's built-in node:sqlite (DatabaseSync,
readOnly) first — no external binary at all — with a retry for busy WAL
states; the sqlite3 binary remains as fallback, resolved from PATH plus
known absolute locations (system, Homebrew, Android SDK). All failures are
logged with the exact error to the 'OpenCode Go Usage' output channel.
---
 CHANGELOG.md          |   2 +
 src/goUsageTracker.ts | 160 ++++++++++++++++++++++++++++++++----------
 2 files changed, 126 insertions(+), 36 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4e1ad7..a3bb2d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,8 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Fixed
 
+- **`[Usage]` SQLite reads no longer depend on the `sqlite3` binary.** The zero-usage mystery was the Android SDK's `sqlite3` (`~/Android/Sdk/platform-tools/sqlite3`) being on the PATH only when VS Code launches from a shell that exports it — desktop-launched windows silently lost all CLI history (Today/Yesterday/Codebase = 0 while the fetched quota kept working). The CLI history is now read through Node's built-in `node:sqlite` first (zero external dependencies, retried twice on busy WAL states), falling back to the `sqlite3` binary resolved from PATH **plus** known locations (system, Homebrew, Android SDK). Failures are logged with the exact error to the "OpenCode Go Usage" output channel.
+
 - **`[Usage]` Panel polish + chat-completion charts.** Hovering anywhere on a chart (not just on points) highlights the nearest day with a guide line + dots and a cursor-follow tooltip; on the Models tab the tooltip lists every model's spend for that day. Two new tabs — **Suggested** and **Approved** — chart inline chat completions with whole-number axes and honest tooltips (the day's suggestion/approval counts, not chat token totals); both series share the exact same day buckets, so hovers never resolve to undefined. Acceptances are detected with a bounded heuristic: VS Code's stable API exposes no inline-completion acceptance event, so committing a ghost text is recognized by the document insert starting exactly at the suggested position with a matching multi-character text (30s window, cleared on first match — see `matchesAcceptance`). The default chart window is **Lifetime**, switchable live via the **Window** button (Week → 14 days → Month → Lifetime). The panel brand shows only the profile name, the legend swatches are square and text-aligned, and axes keep round equal tick steps.
 
 - **`[Usage]` Full-page usage panel.** The usage webview is now a complete dashboard (inspired by the reference page): subscription meters as animated rings, stat chips for Today / Yesterday / Codebase, an interactive chart area with Spend / Requests / Tokens tabs (all line charts) and a By-model tab (overlapping colored line charts per model by spend, with a legend and hover tooltips for the model · day · spend/tokens/requests breakdown). Data follows the cursor with a tooltip on every chart element. Chart window: `opencodego.usageChartDays` (default 14 days). The all-time workspace row is labeled **Codebase** everywhere (panel, quick-pick, status-bar tooltip); the old "Top model" / "Models used" chips are gone. Styled action buttons sit in the panel's top-right corner: **Set targets**, **Rename** (when multiple profiles exist) and **Refresh** — wired through `vscode.postMessage`, and a refresh keeps the active tab (data is pushed in place, the page is never reloaded; the background loop still runs at `usageRefreshIntervalSeconds`). Chart axes use round tick steps (1/2/2.5/5 × 10ⁿ) so gaps are always equal and clean (no more 1.25/2.50/3.75 divisions).
diff --git a/src/goUsageTracker.ts b/src/goUsageTracker.ts
index 0ef8dd6..d66df4c 100644
--- a/src/goUsageTracker.ts
+++ b/src/goUsageTracker.ts
@@ -517,45 +517,133 @@ function readOpenCodeHistoryUncached(): HistoryRow[] | null {
     return null;
   }
 
-  // Two attempts: transient busy/lock states (e.g. the CLI checkpointing a
-  // large WAL) resolve within the 5s sqlite busy-timeout.
-  for (let attempt = 0; attempt < 2; attempt++) {
-    try {
-      const result = execFileSync("sqlite3", ["-readonly", "-cmd", ".timeout 5000", "-json", OPENCODE_DB_PATH, HISTORY_ROWS_SQL], {
-        timeout: 10_000,
-        maxBuffer: 64 * 1024 * 1024,
-        encoding: "utf-8",
-        stdio: ["pipe", "pipe", "pipe"],
-      });
-      const rows: unknown = JSON.parse(result);
-      if (!Array.isArray(rows)) return null;
-      return rows
-        .filter((row): row is HistoryRow => {
-          if (!row || typeof row !== "object") return false;
-          const candidate = row as Partial<HistoryRow>;
-          return (
-            typeof candidate.createdMs === "number" && candidate.createdMs > 0 && typeof candidate.cost === "number" && candidate.cost >= 0
-          );
-        })
-        .map((row) => ({
-          createdMs: row.createdMs,
-          cost: row.cost,
-          tokensInput: positiveNumberish(row.tokensInput),
-          tokensOutput: positiveNumberish(row.tokensOutput),
-          tokensReasoning: positiveNumberish(row.tokensReasoning),
-          tokensCacheRead: positiveNumberish(row.tokensCacheRead),
-          cwd: typeof row.cwd === "string" && row.cwd.trim() ? row.cwd : undefined,
-          modelId: typeof row.modelId === "string" && row.modelId.trim() ? row.modelId : undefined,
-        }));
-    } catch (error) {
-      const message = getErrorMessage(error);
-      if (attempt === 0) {
-        historyReadDiagnostic?.(`[go-usage] CLI history read failed (attempt 1): ${message}. Retrying…`);
-      } else {
-        historyReadDiagnostic?.(`[go-usage] CLI history read failed: ${message}`);
+  // The `sqlite3` binary may be missing from the extension host's PATH (it is
+  // often only available from the Android SDK, e.g. launched from a terminal),
+  // so Node's built-in reader is tried first — zero external dependencies.
+  const viaNode = readHistoryViaNodeSqlite();
+  if (viaNode !== undefined) {
+    return viaNode;
+  }
+
+  return readHistoryViaSqliteCli();
+}
+
+/** Normalize raw rows (shared by both readers). */
+function normalizeHistoryRows(rows: unknown): HistoryRow[] {
+  if (!Array.isArray(rows)) return [];
+  return rows
+    .filter((row): row is HistoryRow => {
+      if (!row || typeof row !== "object") return false;
+      const candidate = row as Partial<HistoryRow>;
+      return (
+        typeof candidate.createdMs === "number" && candidate.createdMs > 0 && typeof candidate.cost === "number" && candidate.cost >= 0
+      );
+    })
+    .map((row) => ({
+      createdMs: row.createdMs,
+      cost: row.cost,
+      tokensInput: positiveNumberish(row.tokensInput),
+      tokensOutput: positiveNumberish(row.tokensOutput),
+      tokensReasoning: positiveNumberish(row.tokensReasoning),
+      tokensCacheRead: positiveNumberish(row.tokensCacheRead),
+      cwd: typeof row.cwd === "string" && row.cwd.trim() ? row.cwd : undefined,
+      modelId: typeof row.modelId === "string" && row.modelId.trim() ? row.modelId : undefined,
+    }));
+}
+
+/**
+ * Read the CLI history with Node's built-in `node:sqlite` (no binary on the
+ * host PATH needed). Returns `undefined` when the module is unavailable on
+ * this host so the caller can fall back to the `sqlite3` binary.
+ */
+function readHistoryViaNodeSqlite(): HistoryRow[] | null | undefined {
+  try {
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
+    const { DatabaseSync } = require("node:sqlite") as {
+      DatabaseSync?: new (
+        path: string,
+        options?: { readOnly?: boolean },
+      ) => {
+        prepare(sql: string): { all(): Record<string, unknown>[] };
+        close(): void;
+      };
+    };
+    if (typeof DatabaseSync !== "function") {
+      return undefined;
+    }
+    // Transient busy/lock states (CLI checkpointing the WAL) resolve quickly.
+    for (let attempt = 0; attempt < 2; attempt++) {
+      try {
+        const db = new DatabaseSync(OPENCODE_DB_PATH, { readOnly: true });
+        try {
+          const rows = db.prepare(HISTORY_ROWS_SQL).all();
+          return rows.length > 0 ? normalizeHistoryRows(rows) : null;
+        } finally {
+          db.close();
+        }
+      } catch (error) {
+        const message = getErrorMessage(error);
+        if (attempt === 0) {
+          historyReadDiagnostic?.(`[go-usage] node:sqlite read failed (attempt 1): ${message}. Retrying…`);
+        } else {
+          historyReadDiagnostic?.(`[go-usage] node:sqlite read failed: ${message}`);
+        }
+      }
+    }
+    return null;
+  } catch (error) {
+    historyReadDiagnostic?.(`[go-usage] node:sqlite unavailable (${getErrorMessage(error)}); falling back to the sqlite3 binary.`);
+    return undefined;
+  }
+}
+
+/**
+ * Candidate `sqlite3` binaries: the PATH-resolved name first, then absolute
+ * paths from common installs (system, Homebrew, Android SDK) — the Android
+ * SDK binary is what most dev machines actually have, and it is frequently
+ * missing from the extension host's PATH.
+ */
+function sqliteCliCandidates(): string[] {
+  const home = os.homedir();
+  return [
+    "sqlite3",
+    "/usr/bin/sqlite3",
+    "/usr/local/bin/sqlite3",
+    "/opt/homebrew/bin/sqlite3",
+    path.join(home, "Android", "Sdk", "platform-tools", "sqlite3"),
+    path.join(home, "Library", "Android", "sdk", "platform-tools", "sqlite3"),
+  ];
+}
+
+function readHistoryViaSqliteCli(): HistoryRow[] | null {
+  for (const binary of sqliteCliCandidates()) {
+    for (let attempt = 0; attempt < 2; attempt++) {
+      try {
+        const result = execFileSync(binary, ["-readonly", "-cmd", ".timeout 5000", "-json", OPENCODE_DB_PATH, HISTORY_ROWS_SQL], {
+          timeout: 10_000,
+          maxBuffer: 64 * 1024 * 1024,
+          encoding: "utf-8",
+          stdio: ["pipe", "pipe", "pipe"],
+        });
+        const rows: unknown = JSON.parse(result);
+        return Array.isArray(rows) ? normalizeHistoryRows(rows) : null;
+      } catch (error) {
+        const message = getErrorMessage(error);
+        // ENOENT just means this candidate isn't present — try the next one.
+        if (attempt === 0 && message.includes("ENOENT")) {
+          break;
+        }
+        if (attempt === 0) {
+          historyReadDiagnostic?.(`[go-usage] sqlite3 read failed (attempt 1): ${message}. Retrying…`);
+        } else {
+          historyReadDiagnostic?.(`[go-usage] sqlite3 read failed (${binary}): ${message}`);
+        }
       }
     }
   }
+  historyReadDiagnostic?.(
+    "[go-usage] CLI history unavailable: no SQLite reader found (node:sqlite missing and no sqlite3 binary on PATH).",
+  );
   return null;
 }
 

From d1c9c59fb8dfd741f309e5452130b0ef2613f0d2 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 16:26:53 +0500
Subject: [PATCH 40/43] fix(usage): freeOnly filter on the metadata-success
 path + escape model names
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- filterAvailableModels now applies definition.filterModel on BOTH the
  metadata-success and the error path (the success path previously skipped
  it, so a failed model-list fetch with a successful models.dev metadata
  fetch could still show paid Zen models to free-only users — flagged by
  the #138 review).
- Model names in the usage panel legend and tooltips are HTML-escaped
  before innerHTML insertion (cheap insurance, flagged by the #138 review).
---
 src/extension.ts | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/extension.ts b/src/extension.ts
index d853b00..6d234cc 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1984,7 +1984,7 @@ function usageWebviewHtml(profileLabel: string): string {
               var c = el('circle', { cx: p.x, cy: p.y, r: '7', fill: 'transparent', stroke: 'none' });
               c.addEventListener('mousemove', function (ev) {
                 showTooltip(ev.clientX, ev.clientY,
-                  '<span class="t-line">' + s.model + ' · ' + dayLabel(p.p.dayStart) + '</span><b>' + fmtUsd(p.p.cost) + '</b>' +
+                  '<span class="t-line">' + esc(s.model) + ' · ' + dayLabel(p.p.dayStart) + '</span><b>' + fmtUsd(p.p.cost) + '</b>' +
                   '<div class="t-sub">' + fmtCount(p.p.tokens) + ' tokens · ' + fmtCount(p.p.requests) + ' requests</div>');
               });
               c.addEventListener('mouseleave', hideTooltip);
@@ -2029,7 +2029,7 @@ function usageWebviewHtml(profileLabel: string): string {
               var dd = el('circle', { cx: pt.x, cy: pt.y, r: '3.5', fill: pt.color, stroke: '#161a20', 'stroke-width': '2' });
               svg.appendChild(dd);
               dots2.push(dd);
-              if (pt.p.cost > 0) lines2.push('<div class="t-sub"><span class="l-swatch" style="background:' + pt.color + ';display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:5px"></span>' + pt.model + ': <b>' + fmtUsd(pt.p.cost) + '</b></div>');
+              if (pt.p.cost > 0) lines2.push('<div class="t-sub"><span class="l-swatch" style="background:' + pt.color + ';display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:5px"></span>' + esc(pt.model) + ': <b>' + fmtUsd(pt.p.cost) + '</b></div>');
             });
             showTooltip(ev.clientX, ev.clientY,
               '<span class="t-line">' + dayLabel(best.p.dayStart) + '</span>' +
@@ -2042,7 +2042,7 @@ function usageWebviewHtml(profileLabel: string): string {
           var legend = document.getElementById('legend');
           legend.innerHTML = series.slice(0, 8).map(function (s, i) {
             var color = MODEL_COLORS[i % MODEL_COLORS.length];
-            return '<span class="l-item"><span class="l-swatch" style="background:' + color + '"></span>' + s.model + '</span>';
+            return '<span class="l-item"><span class="l-swatch" style="background:' + color + '"></span>' + esc(s.model) + '</span>';
           }).join('') + (series.length > 8 ? '<span class="l-more">+' + (series.length - 8) + ' more</span>' : '');
         }
 
@@ -3493,7 +3493,10 @@ class OpenCodeProvider implements vscode.LanguageModelChatProvider<OpenCodeModel
     try {
       const metadataSnapshot = await this.getMetadataSnapshot();
       const filteredModelIds = uniqueModelIds.filter(
-        (modelId) => !KNOWN_UNAVAILABLE_MODEL_IDS.has(modelId) && !shouldHideDeprecatedModel(modelId, this.baseVendor, metadataSnapshot),
+        (modelId) =>
+          !KNOWN_UNAVAILABLE_MODEL_IDS.has(modelId) &&
+          !shouldHideDeprecatedModel(modelId, this.baseVendor, metadataSnapshot) &&
+          (this.definition.filterModel?.(modelId) ?? true),
       );
 
       const removedModelIds = uniqueModelIds.filter((modelId) => !filteredModelIds.includes(modelId));

From 5da9b6c401d48e2331bd0a347a9b949850026d35 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 16:30:48 +0500
Subject: [PATCH 41/43] =?UTF-8?q?fix(autocomplete):=20address=20#136=20rev?=
 =?UTF-8?q?iew=20=E2=80=94=20key=20fallback,=20failure=20logs,=20indentati?=
 =?UTF-8?q?on?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- resolveApiKey now uses the same resolution order as the chat path:
  the active profile's own key first (multi-profile / BYOK-group users),
  then the extension secret.
- The completion engine logs every failure (request error, non-OK status,
  stream interruption) instead of silently returning nothing — testers can
  now report exact reasons from the OpenCode Completions output channel.
- cleanCompletion strips leading spaces/tabs but preserves leading
  newlines, so a completion that continues on a nested line keeps its
  line break (review point 5); covered by a new unit test (276 tests).
---
 src/autocomplete/engine.ts    | 19 +++++++++++++++----
 src/extension.ts              |  4 +++-
 src/test/autocomplete.test.ts |  9 ++++++++-
 3 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/src/autocomplete/engine.ts b/src/autocomplete/engine.ts
index 0417292..53efd86 100644
--- a/src/autocomplete/engine.ts
+++ b/src/autocomplete/engine.ts
@@ -81,12 +81,15 @@ export class ChatCompletionEngine implements CompletionEngine {
         body: JSON.stringify(body),
         signal: AbortSignal.any([signal, AbortSignal.timeout(this.timeoutMs)]),
       });
-    } catch {
+    } catch (error) {
+      const reason = error instanceof Error ? error.message : String(error);
+      this.log?.(`[completions] request failed: ${reason} (model=${ctx.modelId})`);
       // Network error or abort — treat as no completion.
       return { text: undefined, durationMs: Date.now() - started };
     }
 
     if (!response.ok || !response.body) {
+      this.log?.(`[completions] non-OK response: HTTP ${String(response.status)} ${response.statusText} (model=${ctx.modelId})`);
       return { text: undefined, durationMs: Date.now() - started };
     }
 
@@ -112,8 +115,10 @@ export class ChatCompletionEngine implements CompletionEngine {
           }
         }
       }
-    } catch {
+    } catch (error) {
       // Aborted or timed out mid-stream — keep what we have.
+      const reason = error instanceof Error ? error.message : String(error);
+      this.log?.(`[completions] stream interrupted: ${reason} (model=${ctx.modelId})`);
     }
 
     const text = cleanCompletion(collected);
@@ -122,11 +127,17 @@ export class ChatCompletionEngine implements CompletionEngine {
   }
 }
 
-/** Trim whitespace/formatting noise from a raw completion. */
+/**
+ * Trim formatting noise from a raw completion. Fences are removed entirely;
+ * trailing whitespace is trimmed. Leading spaces/tabs are stripped (the
+ * cursor already sits on indented code, so a leading space would double it),
+ * but leading NEWLINES are preserved — a completion that continues on a new
+ * line (nested blocks) must keep its line break.
+ */
 export function cleanCompletion(raw: string): string {
   return raw
     .replace(/^```[a-zA-Z0-9_-]*\s*\n?/, "")
     .replace(/\n?```\s*$/, "")
-    .replace(/^\s+/, "")
+    .replace(/^[ \t]+/, "")
     .replace(/\s+$/, "");
 }
diff --git a/src/extension.ts b/src/extension.ts
index 6d234cc..66c4d5d 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1099,7 +1099,9 @@ export function activate(context: vscode.ExtensionContext) {
   // `opencodego.inlineSuggestions`; the provider reads the config live.
   registerInlineCompletions(context, {
     chatCompletionsUrl: PROVIDERS[GO_VENDOR].chatCompletionsUrl,
-    resolveApiKey: async () => _extensionContext?.secrets.get(SECRET_KEY),
+    // Same resolution order as the chat path: the active profile's own key
+    // first (covers multi-profile / BYOK-group setups), then the secret.
+    resolveApiKey: async () => profileApiKeys.get(activeProfileFingerprint) ?? _extensionContext?.secrets.get(SECRET_KEY),
   });
 }
 
diff --git a/src/test/autocomplete.test.ts b/src/test/autocomplete.test.ts
index ee4703e..57f5e79 100644
--- a/src/test/autocomplete.test.ts
+++ b/src/test/autocomplete.test.ts
@@ -92,7 +92,14 @@ describe("autocomplete — engine parsing", () => {
 
   it("cleanCompletion strips fences and surrounding whitespace", () => {
     assert.equal(cleanCompletion("```ts\nconst x = 1;\n```"), "const x = 1;");
-    assert.equal(cleanCompletion("  \nconst y = 2;\n  "), "const y = 2;");
+    // leading spaces are stripped, the leading newline is kept
+    assert.equal(cleanCompletion("  \nconst y = 2;\n  "), "\nconst y = 2;");
+  });
+
+  it("cleanCompletion strips leading spaces/tabs but keeps leading newlines", () => {
+    // A completion continuing on a new (nested) line must keep its line break.
+    assert.equal(cleanCompletion("  return true;"), "return true;");
+    assert.equal(cleanCompletion("\n    return inner;\n  }"), "\n    return inner;\n  }");
   });
 });
 

From 1c26fd17f2747983ecdd44f28c29306e41667567 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 16:36:02 +0500
Subject: [PATCH 42/43] fix(models): add qwen3.7-plus to the bundled fallback
 lists
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The model was already in the settings enum and the tracker's bundled
pricing table, but missing from the Go provider's fallback model list and
the bundled metadata snapshot — so offline/degraded mode never offered it
(#136 review). Now consistent everywhere.
---
 src/extension.ts | 1 +
 src/metadata.ts  | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/extension.ts b/src/extension.ts
index 66c4d5d..ccedda7 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -504,6 +504,7 @@ const PROVIDERS: Record<ProviderDefinition["vendor"], ProviderDefinition> = (()
       "minimax-m2.7",
       "minimax-m2.5",
       "qwen3.7-max",
+      "qwen3.7-plus",
       "qwen3.6-plus",
       "qwen3.5-plus",
       "gpt-5.6-luna",
diff --git a/src/metadata.ts b/src/metadata.ts
index 4fc1627..f8cafd0 100644
--- a/src/metadata.ts
+++ b/src/metadata.ts
@@ -179,6 +179,7 @@ const MODEL_LIMITS_BY_PROVIDER: Record<ProviderVendor, Record<string, BaseModelL
     "minimax-m2.1": { contextWindow: 204800, maxOutputTokens: 131072 },
     "minimax-m2": { contextWindow: 204800, maxOutputTokens: 131072 },
     "qwen3.7-max": { contextWindow: 1000000, maxOutputTokens: 65536 },
+    "qwen3.7-plus": { contextWindow: 262144, maxOutputTokens: 65536 },
     "qwen3.6-plus": { contextWindow: 262144, maxOutputTokens: 65536 },
     "qwen3.5-plus": { contextWindow: 262144, maxOutputTokens: 65536 },
     "gpt-5.6-luna": { contextWindow: 1050000, maxOutputTokens: 128000 },

From abbfcd2bdbb9587b82ade26337a87022ad4a43a4 Mon Sep 17 00:00:00 2001
From: Fahad Iftikhar <fahad090np@gmail.com>
Date: Thu, 13 Aug 2026 16:50:52 +0500
Subject: [PATCH 43/43] docs(changelog): note autocomplete spend attribution as
 a known limitation

#136 review point 3 asked for at minimum a docs note that completion
requests bypass tracker.record(); the Suggested/Approved counters cover
counts but USD cost attribution is a planned follow-up.
---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3bb2d3..fded16e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ All notable changes to the **OpenCode Go BYOK Provider** extension are documente
 
 ### Added
 
+- **`[Autocomplete]` Known limitation (follow-up planned):** inline-completion requests are not yet wired into the Go usage tracker's cost accounting (`tracker.record()` only runs in the chat provider path). The panel does track **Suggested / Approved** counts per day (see the usage dashboard entry), but the USD cost of completions is not attributed until a follow-up ships the transport summary from the completion engine. This is tracked as a documented TODO on #136/#138 rather than an oversight.
+
 - **`[Autocomplete]` Inline code suggestions (experimental, #49).** Ghost-text completions while typing, powered by the OpenCode gateway with thinking forced off. Opt-in via `opencodego.inlineSuggestions` (default `false`); model via `opencodego.inlineSuggestionsModel` (default `qwen3.5-plus`, whose `enable_thinking=false` mode is a genuine no-reasoning path — measured ~1.5s time-to-first-token with zero hidden reasoning). Requests are tiny (10 lines before the cursor + a short suffix), debounced 300ms, time out at 3s and abort on the next keystroke. The gateway exposes no FIM endpoint, so completions emulate fill-in-the-middle with FIM tokens over `/chat/completions`. New `src/autocomplete/` module (context, prompt, throttle, engine, provider, registration) with unit tests; `scripts/probe-completion-latency.ts` measures engine latency live. All timing/size knobs are user-tunable: `inlineSuggestionsDebounceMs`, `inlineSuggestionsTimeoutMs`, `inlineSuggestionsMaxTokens`, `inlineSuggestionsPrefixLines`, `inlineSuggestionsSuffixChars`.
 - **`[Usage]` Server-accurate Go meters via the official `/zen/go/v1/usage` endpoint (#130).** The status bar, tooltip, quick-pick and usage webview previously showed locally estimated Session/Weekly/Monthly percentages that drifted from opencode.ai (issue #23) because they missed CLI, cross-device and pre-install usage. The tracker now pulls the official endpoint (upstream anomalyco/opencode#16513, verified live) with the existing Go key on startup and after each request (60s TTL cache): rolling/weekly/monthly percent + reset times are server-computed and account-wide, `spent` is derived from the authoritative percent, and Today/Yesterday + per-session spend stay device-local. Failures (401/403/404/network) fall back to the existing SQLite → tracked estimates. The key is only ever sent as the Authorization header and never logged or persisted. New pure module `src/goUsageSync.ts` with unit tests. Documented in `docs/issues/62-20260812-pr132-go-usage-server-sync.md`. PR [#132](https://github.com/ltmoerdani/opencode-copilot-chat/pull/132) by [@Fahad090NP](https://github.com/Fahad090NP).