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The AI coding agent built for the terminal.
- - -[](https://opencode.ai) +# Cerebras Code CLI - Development Changelog + +## Project Overview + +This is a fork of OpenCode, customized and optimized specifically for Cerebras AI infrastructure. The project has been transformed from a multi-provider AI coding agent into a Cerebras-exclusive terminal-based development tool. + +## Collaborators + +This project is maintained by: +- Kevin +- Isaac +- Daniel +- Arihant --- -### Installation +## Commits Categorized by Strategic Pillars + +> **⚠️ IMPORTANT:** When making new commits, update this section with your changes under the appropriate pillar. -```bash -# YOLO -curl -fsSL https://opencode.ai/install | bash +### **Pillar 1: Idea Stack (Infrastructure & Architecture)** +*Focus: Architecture, infrastructure, CI/CD, provider systems* -# Package managers -npm i -g opencode-ai@latest # or bun/pnpm/yarn -scoop bucket add extras; scoop install extras/opencode # Windows -choco install opencode # Windows -brew install opencode # macOS and Linux -paru -S opencode-bin # Arch Linux -mise use --pin -g ubi:sst/opencode # Any OS -nix run nixpkgs#opencode # or github:sst/opencode for latest dev branch -``` +- **499180d29** - Add latest commit to README pillars (maintaining the rule) +- **9ffb274ca** - Update commit hash in README (final hash after amendment) +- **f985bf604** - Move pillars to top of README and add update enforcement rule (pre-push hook + guideline doc) +- **b72735c6f** - Cerebras-only provider architecture (removed 1,263 lines of multi-provider abstraction) +- **b7e33ea65** - Package rename for Cerebras branding +- **0c19e077e** - Package version update +- **d68f3099c** - Husky pre-push hook setup (13 insertions) +- **1ba691f3f** - Pre-push hook enhancement (6 insertions) +- **64f74e988** - TypeScript configuration updates (type shims and tsconfig) -> [!TIP] -> Remove versions older than 0.1.x before installing. +### **Pillar 2: TUI Features (User Interface & Experience)** +*Focus: UI/UX improvements, metrics display, user interactions* -#### Installation Directory +- **04d4611a1** - Add prompt cache hit rate tracking to sidebar (real-time cache efficiency with sparkline trend graph) +- **bde924a60** - Request usage information display (replaced pricing with metrics in header/sidebar) +- **b72735c6f** - UI simplification (removed provider dialogs, streamlined session/context UX) -The install script respects the following priority order for the installation path: +### **Pillar 3: SDK Level Features (Core Functionality & API)** +*Focus: Core functionality, authentication, retry logic, SDK capabilities* -1. `$OPENCODE_INSTALL_DIR` - Custom installation directory -2. `$XDG_BIN_DIR` - XDG Base Directory Specification compliant path -3. `$HOME/bin` - Standard user binary directory (if exists or can be created) -4. `$HOME/.opencode/bin` - Default fallback +- **42ce88a03** - Exponential backoff fix (improved retry logic) +- **d76d0fca4** - Backoff timeout configuration (60-second max) +- **b72735c6f** - PKCE authentication implementation (OAuth 2.0 with 139-line login module) +- **0e60f6660** - Complete Python SDK (229 files, 22,322 insertions, co-authored with Aiden Cline) -```bash -# Examples -OPENCODE_INSTALL_DIR=/usr/local/bin curl -fsSL https://opencode.ai/install | bash -XDG_BIN_DIR=$HOME/.local/bin curl -fsSL https://opencode.ai/install | bash -``` +### **Pillar 4: Experiment and Reporting (Metrics & Analytics)** +*Focus: Metrics, logging, experimentation tracking, analytics* -### Agents +- **bde924a60** - Metrics display implementation (request usage tracking, foundation for future analytics) -OpenCode includes two built-in agents you can switch between, -you can switch between these using the `Tab` key. +--- -- **build** - Default, full access agent for development work -- **plan** - Read-only agent for analysis and code exploration - - Denies file edits by default - - Asks permission before running bash commands - - Ideal for exploring unfamiliar codebases or planning changes +### Major Cache Optimizations -Also, included is a **general** subagent for complex searches and multi-step tasks. -This is used internally and can be invoked using `@general` in messages. + 1. Enable Prompt Caching for Anthropic (commit: 1a553e525, June 16, 2025) -Learn more about [agents](https://opencode.ai/docs/agents). + - Added cacheControl: { type: "ephemeral" } to system prompts for Anthropic models + - Initial implementation of prompt caching support -### Documentation + 2. Limit to 4 System Prompts Cached (commit: 63996c418, June 16, 2025) -For more info on how to configure OpenCode [**head over to our docs**](https://opencode.ai/docs). + - Restricted cache control to only the first 4 system messages + - Code change in packages/opencode/src/session/index.ts:478: + ...(input.providerID === "anthropic" && index < 4 + ? { anthropic: { cacheControl: { type: "ephemeral" } } } + : {}) -### Contributing + 3. Make System Prompt "Less Fast" for Better Caching (commit: 7d174767b, June 15, 2025) -If you're interested in contributing to OpenCode, please read our [contributing docs](./CONTRIBUTING.md) before submitting a pull request. + - Changed SystemPrompt.environment(sessionID) to SystemPrompt.environment() - removing session-specific context from environment prompts + - This means environment prompts are now static across sessions, dramatically improving cache hit rate + - Replaced dynamic file listing with static tree structure + - Added Ripgrep.files() for consistent file enumeration -### Collaborators + 4. Huge Optimization for Token Usage (commit: 1684042fb, June 20, 2025) -This project is maintained by: -- Kevin -- Isaac -- Daniel -- Arihant + - Strategic cache placement: Changed from caching first 4 messages to caching: + - First 2 system messages + - Last 2 messages in the conversation + const system = msgs.filter((msg) => msg.role === "system").slice(0, 2) + const final = msgs.filter((msg) => msg.role !== "system").slice(-2) + for (const msg of unique([...system, ...final])) { + msg.providerMetadata = { + anthropic: { cacheControl: { type: "ephemeral" } } + } + } + - This maximizes cache reuse for both static content and recently-used context + + 5. Cache Version Concept (commit: 4bb8536d3, July 11, 2025) + + - Introduced versioning system to auto-cleanup cache when breaking changes occur + - Prevents stale cache from causing issues + + 6. Retain Cache When Cycling Between Subagent/Parent Sessions (commit: b3885d161, August 16, 2025) + + - TUI optimization to preserve cache when switching between subagent and parent sessions + - Improves performance in multi-agent workflows + + 7. Summary Optimizations (commit: 75c29d4d1, November 22, 2025) + + - Pruned tool outputs in summaries: part.state.output = "[TOOL OUTPUT PRUNED]" + - Reduced summary prompt complexity + - Better options handling for cache-friendly requests + + Looking at Kevin's commits specifically (author: kevint-cerebras), none of them directly focused on cache hit rate optimizations. Kevin's work focused on: + - Exponential backoff fixes + - Cerebras-only provider architecture + - PKCE authentication + - UI enhancements (request usage display) + - Package infrastructure + +--- + +## Detailed Work Completed Before December 15, 2025 + +### **December 9, 2025** + +#### Exponential Backoff Fix (Commit: 42ce88a03) +**Files Modified:** +- `packages/opencode/src/session/processor.ts` +- `packages/opencode/src/session/retry.ts` + +**Changes:** +- Fixed exponential backoff algorithm to properly handle API request retries +- Improved retry logic to prevent overwhelming the Cerebras API during rate limiting or service interruptions +- Enhanced error recovery mechanisms in the session processor +- Modified retry timing calculations to follow industry-standard exponential backoff patterns +- Total changes: 26 insertions, 18 deletions across 2 files + +**Impact:** This change significantly improves the stability and reliability of the CLI when dealing with network issues or API rate limits, ensuring a smoother user experience during high-load scenarios. + +#### Backoff Timeout Configuration (Commit: d76d0fca4) +**Files Modified:** +- `packages/opencode/src/session/processor.ts` +- `packages/opencode/src/session/retry.ts` + +**Changes:** +- Set maximum backoff timeout to 60 seconds for retry operations +- Adjusted retry intervals to balance between rapid recovery and API rate limit compliance +- Fine-tuned timeout parameters to optimize for Cerebras API response patterns +- Total changes: 9 insertions, 7 deletions across 2 files + +**Impact:** Prevents indefinite waiting during API failures while maintaining respectful API usage patterns. + +--- + +### **December 8, 2025** + +#### UI Enhancement: Request Usage Information (Commit: bde924a60) +**Files Modified:** +- `packages/opencode/src/cli/cmd/tui/routes/session/header.tsx` +- `packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx` + +**Changes:** +- Replaced pricing statistics display with request usage information in the TUI +- Updated header component to show real-time request metrics +- Modified sidebar to display usage tracking instead of cost calculations +- Improved user visibility into API consumption patterns +- Enhanced UX by providing actionable usage data rather than pricing information +- Total changes: 41 insertions, 20 deletions across 2 files + +**Impact:** Users can now better understand their API usage patterns, making it easier to optimize their workflow and manage resource consumption. -### Building on OpenCode +#### Major Architecture Change: Cerebras-Only Provider (Commit: b72735c6f) +**Files Modified:** +- `packages/opencode/src/cli/cmd/tui/app.tsx` +- `packages/opencode/src/cli/cmd/tui/component/dialog-model.tsx` +- `packages/opencode/src/cli/cmd/tui/component/prompt/autocomplete.tsx` +- `packages/opencode/src/cli/cmd/tui/context/local.tsx` +- `packages/opencode/src/cli/cmd/tui/routes/session/index.tsx` +- `packages/opencode/src/provider/cerebras/login.ts` (NEW) +- `packages/opencode/src/provider/provider.ts` +- `packages/opencode/src/server/server.ts` -If you are working on a project that's related to OpenCode and is using "opencode" as a part of its name; for example, "opencode-dashboard" or "opencode-mobile", please add a note to your README to clarify that it is not built by the OpenCode team and is not affiliated with us in anyway. +**Changes:** +- **Complete Provider Refactoring:** Removed multi-provider abstraction layer, making Cerebras the exclusive AI provider +- **PKCE Authentication Implementation:** Added OAuth 2.0 PKCE (Proof Key for Code Exchange) flow for enhanced security + - Created new `login.ts` module with secure authentication handling + - Implemented code verifier and challenge generation + - Added token management and refresh mechanisms +- **UI Simplification:** Removed provider selection dialogs and model switching UI elements +- **Context Optimization:** Streamlined local context management for single-provider architecture +- **Session Handling:** Updated session management to work exclusively with Cerebras infrastructure +- **Autocomplete Enhancement:** Modified autocomplete to use Cerebras-specific model capabilities +- **Server Configuration:** Updated server initialization to use Cerebras endpoints +- **Code Cleanup:** Removed 1,263 lines of unused provider abstraction code +- Total changes: 361 insertions, 1,263 deletions across 8 files -### FAQ +**Impact:** This is the most significant architectural change, dramatically simplifying the codebase by removing unnecessary abstraction layers. The PKCE authentication provides enterprise-grade security for API access, and the streamlined architecture improves performance and maintainability. -#### How is this different than Claude Code? +#### Pre-Push Hook Enhancement (Commit: 1ba691f3f) +**Files Modified:** +- `.husky/pre-push` -It's very similar to Claude Code in terms of capability. Here are the key differences: +**Changes:** +- Enhanced git pre-push hook with additional validation checks +- Added safeguards to prevent pushing broken code to remote repository +- Total changes: 6 insertions -- 100% open source -- Not coupled to any provider. Although we recommend the models we provide through [OpenCode Zen](https://opencode.ai/zen); OpenCode can be used with Claude, OpenAI, Google or even local models. As models evolve the gaps between them will close and pricing will drop so being provider-agnostic is important. -- Out of the box LSP support -- A focus on TUI. OpenCode is built by neovim users and the creators of [terminal.shop](https://terminal.shop); we are going to push the limits of what's possible in the terminal. -- A client/server architecture. This for example can allow OpenCode to run on your computer, while you can drive it remotely from a mobile app. Meaning that the TUI frontend is just one of the possible clients. +**Impact:** Improves code quality by catching issues before they reach the remote repository. -#### What's the other repo? +#### Package Version Update (Commit: 0c19e077e) +**Files Modified:** +- `package.json` -The other confusingly named repo has no relation to this one. You can [read the story behind it here](https://x.com/thdxr/status/1933561254481666466). +**Changes:** +- Updated package version to reflect new Cerebras-specific release +- Total changes: 1 insertion, 1 deletion + +**Impact:** Proper version management for release tracking. + +#### Husky Pre-Push Hook Setup (Commit: d68f3099c) +**Files Modified:** +- `.husky/pre-push` (NEW) + +**Changes:** +- Created new pre-push git hook using Husky +- Implemented automated checks before code can be pushed +- Added build verification and test execution triggers +- Total changes: 13 insertions + +**Impact:** Automated quality control ensuring only tested code reaches the repository. + +#### TypeScript Configuration Updates (Commit: 64f74e988) +**Files Modified:** +- `packages/opencode/src/types/shims.d.ts` +- `packages/opencode/tsconfig.json` + +**Changes:** +- Added necessary TypeScript type shims for Cerebras-specific modules +- Updated TypeScript compiler configuration for improved type checking +- Enhanced type safety across the codebase +- Total changes: 5 insertions, 1 deletion across 2 files + +**Impact:** Improved developer experience with better IDE support and type safety. + +#### Package Rename (Commit: b7e33ea65) +**Files Modified:** +- `package.json` + +**Changes:** +- Renamed package to reflect Cerebras-specific branding +- Updated package metadata for proper npm registry identification +- Total changes: 1 insertion, 1 deletion + +**Impact:** Clear distinction from upstream OpenCode project. --- -**Join our community** [Discord](https://discord.gg/opencode) | [X.com](https://x.com/opencode) +### **October 28, 2025** + +#### Python SDK Implementation (Commit: 0e60f6660, PR #2779) +**Co-authored with:** Aiden Cline + +**Files Added:** 229 new files +**Total Changes:** 22,322 insertions, 8 deletions + +**Major Components Created:** + +1. **CI/CD Pipeline:** + - `.github/publish-python-sdk.yml` - Automated publishing workflow for PyPI + +2. **Python Package Structure:** + - Complete package setup with `pyproject.toml` for modern Python packaging + - UV lock file for deterministic dependency management + - Proper package metadata and versioning + +3. **Documentation System:** + - MkDocs-based documentation site (`mkdocs.yml`) + - Comprehensive guides: + - Installation guide + - Quickstart tutorial + - Configuration documentation + - Files and projects management + - Session handling + - Streaming API usage + - Code generation workflows + - Testing procedures + - Publishing guidelines + +4. **API Client Implementation:** + - Full REST API client with async support + - 40+ endpoint implementations including: + - Agent management (`app_agents.py`) + - Command listing (`command_list.py`) + - Configuration management (`config_get.py`, `config_providers.py`) + - Event subscription system (`event_subscribe.py`) + - File operations (`file_status.py`) + - Path utilities (`path_get.py`) + - Project management (`project_current.py`, `project_list.py`) + - Session handling (`session_list.py`) + - Tool integration (`tool_ids.py`) + - TUI controls (`tui_*.py` modules) + +5. **Data Models (150+ Pydantic Models):** + - Agent models and configurations + - Message types (assistant, user, tool, reasoning) + - Session management models + - File and project structures + - Permission and authentication models + - OAuth and API auth models + - Error handling models + - Event subscription models + - Configuration schemas + - Model provider definitions + - Symbol and code navigation models + +6. **Helper Utilities:** + - `extras.py` - Enhanced client functionality and utilities + - Custom error handling (`errors.py`) + - Type definitions (`types.py`) + - Client initialization and configuration (`client.py`) + +7. **Code Generation Tooling:** + - `scripts/generate.py` - OpenAPI-based code generation script + - `scripts/publish.py` - Automated publishing workflow + - `openapi-python-client.yaml` - Code generation configuration + +8. **Example Applications:** + - `examples/basic_usage.py` - Getting started guide + - `examples/file_status.py` - File monitoring example + - `examples/session_list.py` - Session management example + +9. **Testing Suite:** + - `tests/test_integration.py` - End-to-end integration tests + - `tests/test_wrapper.py` - Unit tests for wrapper functionality + +10. **Advanced Features:** + - Streaming API support with async iterators + - Event subscription system for real-time updates + - LSP (Language Server Protocol) client integration + - MCP (Model Context Protocol) support + - File watcher integration + - OAuth 2.0 authentication flows + - Permission management system + - Project and session state management + - Tool execution framework + - Symbol navigation and code intelligence + +**Impact:** This comprehensive Python SDK enables Python developers to integrate Cerebras-powered AI coding capabilities into their workflows, scripts, and applications. It provides both high-level convenience methods and low-level API access for maximum flexibility. + +--- + +## Summary Statistics + +### Total Commits by Kevin: 10 +### Time Period: October 28, 2025 - December 9, 2025 +### Files Changed: 237 files +### Total Additions: ~22,700 lines +### Total Deletions: ~1,300 lines + +### Key Achievements: + +1. **Security Enhancement:** Implemented PKCE OAuth authentication +2. **Architecture Simplification:** Removed multi-provider complexity +3. **Python Ecosystem Support:** Complete Python SDK with 229 files +4. **Reliability Improvements:** Fixed retry logic and exponential backoff +5. **Developer Experience:** Enhanced TypeScript configuration and git hooks +6. **UI/UX Improvements:** Better usage tracking and information display +7. **Code Quality:** Automated pre-push validation +8. **Documentation:** Comprehensive Python SDK documentation + +--- + +## Technical Impact + +This work has transformed the project from a generic multi-provider AI coding agent into a streamlined, secure, and highly optimized Cerebras-specific development tool. The changes improve: + +- **Performance:** Reduced code complexity and optimized API communication +- **Security:** Enterprise-grade OAuth 2.0 PKCE authentication +- **Reliability:** Improved error handling and retry mechanisms +- **Accessibility:** Python SDK opens the platform to a broader developer audience +- **Maintainability:** Simplified codebase with single provider focus +- **Developer Experience:** Better tooling, testing, and automation + +--- + +## Repository Information + +- **Original Project:** [OpenCode](https://github.com/sst/opencode) +- **Fork Purpose:** Cerebras AI optimization +- **License:** Inherited from OpenCode +- **Platform:** Terminal-based AI coding agent +- **Primary Language:** TypeScript/JavaScript, Python (SDK) diff --git a/packages/opencode/package.json b/packages/opencode/package.json index 973bea00fc..9cd11a5922 100644 --- a/packages/opencode/package.json +++ b/packages/opencode/package.json @@ -1,9 +1,8 @@ { "$schema": "https://json.schemastore.org/package.json", - "version": "1.0.137", - "name": "opencode", + "version": "1.0.140", + "name": "cerebras-code", "type": "module", - "private": true, "scripts": { "typecheck": "tsgo --noEmit", "test": "bun test", @@ -12,7 +11,7 @@ "random": "echo 'Random script updated at $(date)'" }, "bin": { - "opencode": "./bin/opencode" + "cerebras": "./bin/opencode" }, "exports": { "./*": "./src/*.ts" @@ -28,13 +27,13 @@ "@parcel/watcher-linux-x64-musl": "2.5.1", "@parcel/watcher-win32-x64": "2.5.1", "@standard-schema/spec": "1.0.0", - "@tsconfig/bun": "catalog:", + "@tsconfig/bun": "^1.0.9", "@types/babel__core": "7.20.5", - "@types/bun": "catalog:", + "@types/bun": "^1.3.3", "@types/turndown": "5.0.5", "@types/yargs": "17.0.33", - "typescript": "catalog:", - "@typescript/native-preview": "catalog:", + "typescript": "^5.8.2", + "@typescript/native-preview": "^7.0.0-dev.20251207.1", "vscode-languageserver-types": "3.17.5", "why-is-node-running": "3.2.2", "zod-to-json-schema": "3.24.5", @@ -56,50 +55,50 @@ "@ai-sdk/provider-utils": "3.0.18", "@clack/prompts": "1.0.0-alpha.1", "@hono/standard-validator": "0.1.5", - "@hono/zod-validator": "catalog:", + "@hono/zod-validator": "^0.4.2", "@modelcontextprotocol/sdk": "1.15.1", "@octokit/graphql": "9.0.2", "@octokit/rest": "22.0.0", - "@openauthjs/openauth": "catalog:", - "@opencode-ai/plugin": "workspace:*", + "@openauthjs/openauth": "^0.0.0-20250322224806", + "cerebras-plugin": "^1.0.140", "@opencode-ai/script": "workspace:*", - "@opencode-ai/sdk": "workspace:*", + "cerebras-sdk": "^1.0.140", "@opencode-ai/util": "workspace:*", "@openrouter/ai-sdk-provider": "1.2.8", "@opentui/core": "0.1.59", "@opentui/solid": "0.1.59", "@parcel/watcher": "2.5.1", - "@pierre/precision-diffs": "catalog:", + "@pierre/precision-diffs": "^0.6.0-beta.10", "@solid-primitives/event-bus": "1.1.2", "@standard-schema/spec": "1.0.0", "@zip.js/zip.js": "2.7.62", - "ai": "catalog:", + "ai": "^5.0.97", "bun-pty": "0.4.2", "chokidar": "4.0.3", "clipboardy": "4.0.0", "decimal.js": "10.5.0", - "diff": "catalog:", + "diff": "^8.0.2", "fuzzysort": "3.1.0", "gray-matter": "4.0.3", - "hono": "catalog:", - "hono-openapi": "catalog:", + "hono": "^4.10.7", + "hono-openapi": "^1.1.2", "ignore": "7.0.5", "jsonc-parser": "3.3.1", "minimatch": "10.0.3", "open": "10.1.2", "opentui-spinner": "0.0.6", "partial-json": "0.1.7", - "remeda": "catalog:", - "solid-js": "catalog:", + "remeda": "^2.26.0", + "solid-js": "^1.9.10", "strip-ansi": "7.1.2", "tree-sitter-bash": "0.25.0", "turndown": "7.2.0", - "ulid": "catalog:", + "ulid": "^3.0.1", "vscode-jsonrpc": "8.2.1", "web-tree-sitter": "0.25.10", "xdg-basedir": "5.1.0", "yargs": "18.0.0", - "zod": "catalog:", + "zod": "^4.1.8", "zod-to-json-schema": "3.24.5" } } diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx index 83466a0537..e99e537533 100644 --- a/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx +++ b/packages/opencode/src/cli/cmd/tui/routes/session/sidebar.tsx @@ -57,6 +57,46 @@ export function Sidebar(props: { sessionID: string }) { } }) + // Cache hit rate tracking + const cacheMetrics = createMemo(() => { + const assistantMessages = messages().filter((m) => m.role === "assistant" && m.tokens.output > 0) as AssistantMessage[] + + // Calculate current cache hit rate from the last message + const last = assistantMessages[assistantMessages.length - 1] + const currentHitRate = last?.tokens.input > 0 + ? ((last.tokens.cache.read / last.tokens.input) * 100) + : 0 + + // Calculate historical cache hit rates for graphing (last 20 messages) + const history = assistantMessages.slice(-20).map((msg, idx) => { + const hitRate = msg.tokens.input > 0 + ? ((msg.tokens.cache.read / msg.tokens.input) * 100) + : 0 + return { + index: idx, + hitRate: hitRate, + cachedTokens: msg.tokens.cache.read, + totalInputTokens: msg.tokens.input, + } + }) + + // Calculate average hit rate across all messages + const avgHitRate = assistantMessages.length > 0 + ? assistantMessages.reduce((sum, msg) => { + const rate = msg.tokens.input > 0 ? ((msg.tokens.cache.read / msg.tokens.input) * 100) : 0 + return sum + rate + }, 0) / assistantMessages.length + : 0 + + return { + current: currentHitRate, + average: avgHitRate, + history, + lastCached: last?.tokens.cache.read ?? 0, + lastTotal: last?.tokens.input ?? 0, + } + }) + const keybind = useKeybind() const directory = useDirectory() @@ -64,6 +104,18 @@ export function Sidebar(props: { sessionID: string }) { sync.data.provider.some((x) => x.id !== "opencode" || Object.values(x.models).some((y) => y.cost?.input !== 0)), ) + // Generate a sparkline graph for cache hit rates + const createSparkline = (history: Array<{ hitRate: number }>) => { + if (history.length === 0) return "" + const bars = ["▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"] + const max = Math.max(...history.map(h => h.hitRate), 1) + return history.map(h => { + const normalized = h.hitRate / max + const index = Math.min(Math.floor(normalized * bars.length), bars.length - 1) + return bars[index] + }).join("") + } + return (