diff --git a/AGENTS.md b/AGENTS.md
index b9a67ce17..77e8dbbb7 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -1,7 +1,7 @@
# AGENTS.md
## Project overview
-- BandScope is a local-first desktop app for rehearsal prep: a practical song view with likely harmony by section and by instrument or vocal role, form and groove cues, stems, playable ranges, simplification guidance, transposition or setup cues, part-overlap cues, visible confidence, and rehearsal priorities.
+- BandScope is a local-first desktop app for rehearsal prep: a practical song view with likely harmony by section and by instrument or vocal role, form and groove cues, stems, playable ranges, simplification guidance, transposition or setup cues, part-overlap cues, visible confidence, and rehearsal priorities. The ready workspace names tonight's first playable range and the first count-out so the band leaves the section together.
- Authoritative delivery rules live in `ARCHITECTURE.md`, `docs/plans/`, and the root verification scripts.
- Brand, tone, UX copy, and prioritization rules live in `docs/brand-story.md` and must be applied to PRDs, TRDs, UI copy, onboarding, empty states, and error messages.
- App security rules live in `docs/security/app-security.md` and must be applied to file handling, URL intake, subprocesses, IPC, WebView usage, model loading, updates, logging, cache handling, and export behavior.
diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index ca0df5ac4..45b3791ef 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -82,7 +82,7 @@ Last updated: 2026-03-11
- likely harmony by section and by role
- section roadmap with entries, dropouts, pickups, stops, tags, and handoffs
- groove and timing cues relevant to locking the band together
- - playable ranges and density or overlap warnings, with the ready workspace naming tonight's first span and the next instrument check
+ - playable ranges and density or overlap warnings, with the ready workspace naming tonight's first span, the next instrument check, and the first count-out so the band leaves the section together
- simplification, transposition, capo, tuning, or setup cues where applicable
- role-specific rehearsal priorities and confidence flags
- cue-sheet or chart-style exports that summarize the analysis in rehearsal-friendly form
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b6f7e784..9781f44ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
### Added
- Name tonight's first playable range on the ready rehearsal map and tell the player to check that span on their instrument before the section.
+- Name tonight's first count-out on the ready rehearsal map and tell the player to leave the section together.
- Display the analyzed song tempo (BPM) as a badge in the rehearsal workspace.
- 각 합주 역할(Role)별 개인 연습 진행도를 0~100% 범위로 기록 및 시각화할 수 있는 연습 진척도(`practiceProgress`) 트래커 기능 추가. UI 컨트롤(슬라이더 및 +/- 버튼)과 한/영 다국어 지원 포함.
diff --git a/CLAUDE.md b/CLAUDE.md
index b5a34c1fa..ad14b2677 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -51,7 +51,7 @@ BandScope is a local-first desktop app for rehearsal prep: it turns a song into
Three layers, decoupled through shared contracts:
-- `apps/desktop` — Tauri 2 + Vite + React 19 shell (Tailwind 4, Base UI, Storybook). Feature screens live in `src/features/` (home, workspace, chords, ranges, player, settings). The ready workspace names tonight's first playable range and the next instrument check. `src/lib/analysis.ts` and `src/lib/job_runner.ts` call typed Tauri IPC commands, with a browser fallback that serves demo data when not running inside Tauri.
+- `apps/desktop` — Tauri 2 + Vite + React 19 shell (Tailwind 4, Base UI, Storybook). Feature screens live in `src/features/` (home, workspace, chords, ranges, player, settings). The ready workspace names tonight's first playable range, the next instrument check, and the first count-out so the band leaves the section together. `src/lib/analysis.ts` and `src/lib/job_runner.ts` call typed Tauri IPC commands, with a browser fallback that serves demo data when not running inside Tauri.
- `apps/desktop/src-tauri/src/main.rs` — the Rust orchestration boundary. Tauri commands (`start_analysis_job`, `get_analysis_job_status`, `select_local_audio_source`, `import_youtube_url`) validate untrusted input (project IDs, file paths, URLs) and spawn the Python engine as a subprocess. There is no loopback HTTP listener and no network path for local analysis.
- `services/analysis-engine` — Python package `bandscope_analysis` (librosa/numpy). Entry point `cli.py` reads a JSON job request on stdin and prints a structured job-status JSON envelope on stdout (`--progress-jsonl` streams progress lines). `api.py` orchestrates the pipeline across the `separation`, `sections`, `roles`, `chords`, `ranges`, `temporal`, `transcription`, and `youtube` modules.
diff --git a/apps/desktop/src/features/workspace/Workspace.test.tsx b/apps/desktop/src/features/workspace/Workspace.test.tsx
index 7837bf80e..840f83b5b 100644
--- a/apps/desktop/src/features/workspace/Workspace.test.tsx
+++ b/apps/desktop/src/features/workspace/Workspace.test.tsx
@@ -196,6 +196,47 @@ describe("Workspace", () => {
);
});
+ it("names tonight's first count-out and the next leave-together", () => {
+ setNavigatorLanguage("en-US");
+ const song = createDemoRehearsalSong();
+
+ render();
+
+ const callout = screen.getByTestId("first-count-out");
+ expect(callout).toHaveTextContent("Tonight's first count-out");
+ expect(callout).toHaveTextContent("verse ends at 0:30. Count out that last bar before you leave the verse.");
+ });
+
+ it("keeps the selected active part on tonight's first count-out", () => {
+ setNavigatorLanguage("en-US");
+ const song = createDemoRehearsalSong();
+
+ render();
+ fireEvent.click(screen.getByRole("tab", { name: "Lead Vocal" }));
+
+ expect(screen.getByTestId("first-count-out")).toHaveTextContent(
+ "verse ends at 0:30. Count out that last bar before you leave the verse."
+ );
+ });
+
+ it("asks the player to confirm the end when the selected part sits out", () => {
+ setNavigatorLanguage("en-US");
+ const song = createDemoRehearsalSong();
+ song.sections[0] = {
+ ...song.sections[0]!,
+ partGraph: song.sections[0]!.partGraph.map((node) =>
+ node.role_id === "keys-right" ? { ...node, is_active: false } : node
+ )
+ };
+
+ render();
+ fireEvent.click(screen.getByRole("tab", { name: "Keyboard 1 Right Hand" }));
+
+ expect(screen.getByTestId("first-count-out")).toHaveTextContent(
+ "Tonight's first count-out still needs an end time. Confirm where the first section ends before you leave it."
+ );
+ });
+
it("falls back from blank planning copy and tolerates partial collaboration payloads", () => {
setNavigatorLanguage("en-US");
const song = createDemoRehearsalSong();
@@ -325,5 +366,6 @@ describe("Workspace", () => {
expect(screen.getByText("스템")).toBeTruthy();
expect(screen.getByText("합주 우선순위")).toBeTruthy();
expect(screen.getByText("역할과 화성")).toBeTruthy();
+ expect(screen.getByText("오늘 먼저 맞출 끝 박")).toBeTruthy();
});
});
diff --git a/apps/desktop/src/features/workspace/Workspace.tsx b/apps/desktop/src/features/workspace/Workspace.tsx
index d44e20777..3f732ba56 100644
--- a/apps/desktop/src/features/workspace/Workspace.tsx
+++ b/apps/desktop/src/features/workspace/Workspace.tsx
@@ -5,6 +5,7 @@ import { SectionRoadmap } from "./SectionRoadmap";
import { GrooveMap } from "./GrooveMap";
import { PracticeProgress } from "./PracticeProgress";
import { fillRangeCopy, firstRangeSqueeze } from "./firstRangeSqueeze";
+import { firstCountOut } from "./firstCountOut";
import { createTranslator, detectPreferredLocale } from "../../i18n";
import { generateCueSheetCsv, generateChartSummaryJson, generateMetadataHandoffJson, sanitizeFilename } from "../../lib/export";
import { Button } from "@/components/ui/button";
@@ -163,6 +164,13 @@ export function Workspace({ song, sourceBootstrap = null, onSongUpdate }: Worksp
}
)
: t("workspaceFirstRangeMissing");
+ const namedCountOut = useMemo(() => firstCountOut(song, activeRole), [activeRole, song]);
+ const firstCountOutCopy = namedCountOut
+ ? fillRangeCopy(t("workspaceFirstCountOutNamed"), {
+ sectionLabel: namedCountOut.sectionLabel,
+ endTime: namedCountOut.endTime
+ })
+ : t("workspaceFirstCountOutMissing");
/** Handle the practice progress change internally by immutably updating the song state. */
const handlePracticeProgressChange = (newProgress: number) => {
@@ -309,6 +317,14 @@ export function Workspace({ song, sourceBootstrap = null, onSongUpdate }: Worksp
{t("workspaceFirstRangeTitle")}
{firstRangeCopy}
+
+ {t("workspaceFirstCountOutTitle")}
+ {firstCountOutCopy}
+
diff --git a/apps/desktop/src/features/workspace/firstCountOut.test.ts b/apps/desktop/src/features/workspace/firstCountOut.test.ts
new file mode 100644
index 000000000..daf37a098
--- /dev/null
+++ b/apps/desktop/src/features/workspace/firstCountOut.test.ts
@@ -0,0 +1,110 @@
+import {
+ createDemoRehearsalSong,
+ parseRehearsalSong,
+ type RehearsalSong
+} from "@bandscope/shared-types";
+import { describe, expect, it } from "vitest";
+import { fillRangeCopy } from "./firstRangeSqueeze";
+import { firstCountOut, formatCountOutTime } from "./firstCountOut";
+
+function withSectionTime(
+ song: RehearsalSong,
+ timeRange: RehearsalSong["sections"][number]["timeRange"],
+ label: string = song.sections[0]!.label
+): RehearsalSong {
+ return {
+ ...song,
+ sections: song.sections.map((section, index) =>
+ index === 0
+ ? { ...section, label: label as RehearsalSong["sections"][number]["label"], timeRange }
+ : section
+ )
+ };
+}
+
+describe("formatCountOutTime", () => {
+ it("formats bounded whole seconds as m:ss", () => {
+ expect(formatCountOutTime(0)).toBe("0:00");
+ expect(formatCountOutTime(30)).toBe("0:30");
+ expect(formatCountOutTime(30.9)).toBe("0:30");
+ expect(formatCountOutTime(90)).toBe("1:30");
+ });
+
+ it("fails closed on non-finite, negative, non-number, or oversized ends", () => {
+ for (const value of [Number.NaN, Number.POSITIVE_INFINITY, -1, "30", 4_294_967_296]) {
+ expect(formatCountOutTime(value)).toBeNull();
+ }
+ });
+});
+
+describe("firstCountOut", () => {
+ it("names the first section end from existing time-range evidence", () => {
+ expect(firstCountOut(createDemoRehearsalSong())).toEqual({
+ sectionLabel: "verse",
+ endTime: "0:30"
+ });
+ });
+
+ it("does not turn migrated legacy timing placeholders into count-out evidence", () => {
+ const seed = createDemoRehearsalSong();
+ const legacySong = {
+ ...seed,
+ sections: seed.sections.map(({ timeRange: _timeRange, ...section }) => section)
+ };
+ const migrated = parseRehearsalSong(legacySong);
+
+ expect(migrated.sections[0]!.timeRange).toEqual({ start: 0, end: 1 });
+ expect(firstCountOut(migrated)).toBeNull();
+ });
+
+ it("skips blank labels until a named section end exists", () => {
+ const song = withSectionTime(createDemoRehearsalSong(), { start: 10, end: 30 }, "none");
+ expect(firstCountOut(song)).toBeNull();
+ });
+
+ it("skips inverted, inherited, or malformed time ranges", () => {
+ const inherited = Object.create({ start: 10, end: 30 }) as RehearsalSong["sections"][number]["timeRange"];
+ expect(firstCountOut(withSectionTime(createDemoRehearsalSong(), { start: 30, end: 10 }))).toBeNull();
+ expect(firstCountOut(withSectionTime(createDemoRehearsalSong(), inherited))).toBeNull();
+ expect(
+ firstCountOut(withSectionTime(createDemoRehearsalSong(), { start: Number.NaN, end: 30 }))
+ ).toBeNull();
+ });
+
+ it("keeps the selected active part on tonight's first count-out", () => {
+ expect(firstCountOut(createDemoRehearsalSong(), "lead-vocal")).toEqual({
+ sectionLabel: "verse",
+ endTime: "0:30"
+ });
+ });
+
+ it("returns null when the selected part sits out of the only named end", () => {
+ const song = createDemoRehearsalSong();
+ song.sections[0] = {
+ ...song.sections[0]!,
+ partGraph: song.sections[0]!.partGraph.map((node) =>
+ node.role_id === "keys-right" ? { ...node, is_active: false } : node
+ )
+ };
+
+ expect(firstCountOut(song, "keys-right")).toBeNull();
+ expect(firstCountOut(song, "missing-role")).toBeNull();
+ });
+
+ it("fails closed on malformed runtime roots", () => {
+ for (const malformed of [null, {}, { sections: {} }, { sections: [null] }]) {
+ expect(firstCountOut(malformed as unknown as RehearsalSong)).toBeNull();
+ }
+ });
+});
+
+describe("count-out copy filling", () => {
+ it("keeps rehearsal values literal", () => {
+ expect(
+ fillRangeCopy("{sectionLabel} ends at {endTime}.", {
+ sectionLabel: "verse {endTime}",
+ endTime: "0:30"
+ })
+ ).toBe("verse {endTime} ends at 0:30.");
+ });
+});
diff --git a/apps/desktop/src/features/workspace/firstCountOut.ts b/apps/desktop/src/features/workspace/firstCountOut.ts
new file mode 100644
index 000000000..c1095c8c9
--- /dev/null
+++ b/apps/desktop/src/features/workspace/firstCountOut.ts
@@ -0,0 +1,137 @@
+import type { RehearsalSong } from "@bandscope/shared-types";
+import { meaningfulRangeText } from "./firstRangeSqueeze";
+
+/** Tonight's first named section end the band should count out together. */
+export type FirstCountOut = {
+ sectionLabel: string;
+ endTime: string;
+};
+
+const MAX_SECTION_TIME_SECONDS = 4_294_967_295;
+
+/** Return whether an untrusted runtime value is a plain object record. */
+function isRuntimeObject(value: unknown): value is Record {
+ return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+/**
+ * Format a bounded section end as `m:ss`, or fail closed.
+ *
+ * Rejects non-numbers, non-finite values, negatives, and ends above the
+ * shared section-time ceiling so a malformed payload cannot become a
+ * rehearsal count-out.
+ */
+export function formatCountOutTime(totalSeconds: unknown): string | null {
+ if (typeof totalSeconds !== "number" || !Number.isFinite(totalSeconds) || totalSeconds < 0) {
+ return null;
+ }
+ if (totalSeconds > MAX_SECTION_TIME_SECONDS) {
+ return null;
+ }
+ const whole = Math.floor(totalSeconds);
+ const minutes = Math.floor(whole / 60);
+ const seconds = (whole % 60).toString().padStart(2, "0");
+ return `${minutes}:${seconds}`;
+}
+
+/** Admit an own-property boolean `is_active` flag. Inherited evidence is isolated. */
+function isOwnActive(value: Record): boolean {
+ return Object.prototype.hasOwnProperty.call(value, "is_active") && value.is_active === true;
+}
+
+/**
+ * Return whether the selected part is on this section's count-out.
+ *
+ * Prefers own-property `partGraph` activity so a rest is not sold as a
+ * leave-together cue. Falls back to a named role on the section when no
+ * graph node exists.
+ */
+function sectionIncludesActiveRole(
+ sectionValue: Record,
+ activeRole: string
+): boolean {
+ if (Array.isArray(sectionValue.partGraph)) {
+ let sawSelectedNode = false;
+ for (const nodeValue of sectionValue.partGraph) {
+ if (
+ !isRuntimeObject(nodeValue) ||
+ !Object.prototype.hasOwnProperty.call(nodeValue, "role_id")
+ ) {
+ continue;
+ }
+ const roleId = meaningfulRangeText(nodeValue.role_id);
+ if (roleId !== activeRole) {
+ continue;
+ }
+ sawSelectedNode = true;
+ if (isOwnActive(nodeValue)) {
+ return true;
+ }
+ }
+ if (sawSelectedNode) {
+ return false;
+ }
+ }
+
+ if (!Array.isArray(sectionValue.roles)) {
+ return false;
+ }
+ for (const roleValue of sectionValue.roles) {
+ if (!isRuntimeObject(roleValue) || !Object.prototype.hasOwnProperty.call(roleValue, "id")) {
+ continue;
+ }
+ if (meaningfulRangeText(roleValue.id) === activeRole) {
+ return true;
+ }
+ }
+ return false;
+}
+
+/**
+ * Pick the first named section end a player should count out before leaving.
+ *
+ * Uses existing `timeRange.end` authority already produced by analysis.
+ * Blank labels, inverted spans, inherited time fields, inactive selected
+ * parts, and malformed roots fail closed. When a role is selected, only a
+ * section that includes that part as active is named.
+ */
+export function firstCountOut(
+ song: RehearsalSong | unknown,
+ activeRole: string | null = null
+): FirstCountOut | null {
+ if (!isRuntimeObject(song) || !Array.isArray(song.sections)) {
+ return null;
+ }
+
+ for (const sectionValue of song.sections) {
+ if (!isRuntimeObject(sectionValue)) {
+ continue;
+ }
+ const sectionLabel = meaningfulRangeText(sectionValue.label);
+ if (!sectionLabel) {
+ continue;
+ }
+ if (activeRole && !sectionIncludesActiveRole(sectionValue, activeRole)) {
+ continue;
+ }
+ if (
+ !isRuntimeObject(sectionValue.timeRange) ||
+ !Object.prototype.hasOwnProperty.call(sectionValue.timeRange, "start") ||
+ !Object.prototype.hasOwnProperty.call(sectionValue.timeRange, "end")
+ ) {
+ continue;
+ }
+ const start = sectionValue.timeRange.start;
+ const end = sectionValue.timeRange.end;
+ if (typeof start !== "number" || !Number.isFinite(start) || start < 0) {
+ continue;
+ }
+ const endTime = formatCountOutTime(end);
+ if (!endTime || typeof end !== "number" || end < start) {
+ continue;
+ }
+ return { sectionLabel, endTime };
+ }
+
+ return null;
+}
diff --git a/apps/desktop/src/i18n/index.test.ts b/apps/desktop/src/i18n/index.test.ts
index dc49a0a25..f3c88434c 100644
--- a/apps/desktop/src/i18n/index.test.ts
+++ b/apps/desktop/src/i18n/index.test.ts
@@ -60,6 +60,7 @@ describe("i18n", () => {
const t = createTranslator("ko");
expect(t("appTitle")).toBe("BandScope");
expect(t("appSubtitle")).toBe("합주 준비를 위한 로컬-퍼스트 분석 도구");
+ expect(t("workspaceFirstCountOutTitle")).toBe("오늘 먼저 맞출 끝 박");
});
it("falls back to English when a Korean translation is missing", () => {
diff --git a/apps/desktop/src/locales/en/common.json b/apps/desktop/src/locales/en/common.json
index d803a765e..3c1cf3c11 100644
--- a/apps/desktop/src/locales/en/common.json
+++ b/apps/desktop/src/locales/en/common.json
@@ -153,6 +153,9 @@
"workspaceFirstRangeCheck": "{roleName} sits {lowestNote}–{highestNote} in {sectionLabel}. Check that span on your instrument before the {sectionLabel}.",
"workspaceFirstRangeClash": "{roleName} sits {lowestNote}–{highestNote} in {sectionLabel}. Hear that clash on your instrument before the {sectionLabel}.",
"workspaceFirstRangeMissing": "Tonight's first range still needs an ear check. Confirm the high and low notes on the selected part before the first section.",
+ "workspaceFirstCountOutTitle": "Tonight's first count-out",
+ "workspaceFirstCountOutNamed": "{sectionLabel} ends at {endTime}. Count out that last bar before you leave the {sectionLabel}.",
+ "workspaceFirstCountOutMissing": "Tonight's first count-out still needs an end time. Confirm where the first section ends before you leave it.",
"sectionRangeLabel": "Range",
"sectionRangeNextAction": "Check this span on your instrument before {sectionLabel}."
}
diff --git a/apps/desktop/src/locales/ko/common.json b/apps/desktop/src/locales/ko/common.json
index 0f6c6c66d..a9768de50 100644
--- a/apps/desktop/src/locales/ko/common.json
+++ b/apps/desktop/src/locales/ko/common.json
@@ -153,6 +153,9 @@
"workspaceFirstRangeCheck": "{sectionLabel}의 {roleName}은 {lowestNote}–{highestNote}입니다. {sectionLabel} 들어가기 전에 그 음역을 악기로 확인해 보세요.",
"workspaceFirstRangeClash": "{sectionLabel}의 {roleName}은 {lowestNote}–{highestNote}이고 다른 파트와 겹칩니다. {sectionLabel} 들어가기 전에 그 충돌을 악기로 들어 보세요.",
"workspaceFirstRangeMissing": "오늘 먼저 볼 음역은 아직 귀로 확인이 필요합니다. 선택한 파트의 최저·최고음을 첫 구간 전에 확인해 보세요.",
+ "workspaceFirstCountOutTitle": "오늘 먼저 맞출 끝 박",
+ "workspaceFirstCountOutNamed": "{sectionLabel}은 {endTime}에 끝납니다. {sectionLabel}을 나가기 전에 마지막 마디를 맞춰 보세요.",
+ "workspaceFirstCountOutMissing": "오늘 먼저 맞출 끝 박은 아직 없습니다. 첫 구간이 어디서 끝나는지 확인하고 나가기 전에 맞춰 보세요.",
"sectionRangeLabel": "음역",
"sectionRangeNextAction": "{sectionLabel} 들어가기 전에 이 음역을 악기로 확인해 보세요."
}
diff --git a/docs/design-system/component-contract.md b/docs/design-system/component-contract.md
index 22602c313..3d8a6ac98 100644
--- a/docs/design-system/component-contract.md
+++ b/docs/design-system/component-contract.md
@@ -80,6 +80,7 @@ The authoritative Figma view is `31 Component Contract Catalog`. This file mirro
- `LoadingState` keeps `role="status"`, `aria-live="polite"`, `aria-atomic="true"`, and `aria-busy="true"`.
- `ErrorState` keeps `role="alert"`, `aria-live="assertive"`, and visible safe error detail copy.
- `EmptyState` must remain an actionable state card, not a blank placeholder panel.
+- Ready `Workspace` names tonight's first playable range and tonight's first count-out so the map enables the next rehearsal action without opening files or export paths.
- If a new workspace state is added in code, update Figma page 34 and page 33 audit evidence before merging.
## Pattern Backlog
diff --git a/docs/doctoring/first-count-out.md b/docs/doctoring/first-count-out.md
new file mode 100644
index 000000000..eaf452c0a
--- /dev/null
+++ b/docs/doctoring/first-count-out.md
@@ -0,0 +1,17 @@
+# Tonight's first count-out
+
+The ready rehearsal map names the first named section end from existing `timeRange.end` evidence. This is the last bar a player should count out so the band leaves together. It is not a count-in, click, chart bar, or Fine.
+
+## Next action
+
+- Named: count out that last bar before leaving the named section.
+- Missing: confirm where the first section ends before you leave it.
+
+## Security Notes
+
+- Untrusted inputs: `RehearsalSong` JSON, section labels, `timeRange.start` / `timeRange.end`, `partGraph` nodes, `is_active`, and role ids from analysis or a reopened project.
+- Trust boundary: this helper never opens files, URLs, IPC, WebView, subprocesses, model artifacts, or export paths. It only admits own-property finite non-negative section ends at or after the matching start.
+- Allowlist: section labels must be meaningful text. Ends must format as `m:ss` at or below the shared section-time ceiling. When a role is selected, only an own-property active `partGraph` node (or a named role when no graph node exists) can own the count-out.
+- Safe failure: inherited time fields, inverted spans, inactive selected parts, and malformed roots return `null` so the workspace shows the missing-copy next action instead of crashing or inventing an end.
+- Logging/privacy: rejected or accepted times are not logged. Copy interpolation keeps rehearsal values literal.
+- Tests: `firstCountOut.test.ts` and the Workspace callout cover the demo verse end, inverted/inherited times, selected-role scoping, sit-out isolation, and literal copy filling.