diff --git a/AGENTS.md b/AGENTS.md
index b9a67ce17..887811c57 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, leftover sit-out cues after a partial return, simplification guidance, transposition or setup cues, part-overlap cues, visible confidence, and rehearsal priorities.
- 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..5f1ef4555 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 and tonight's first leftover sit-out after a partial return
- 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..fc3fdfb3f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
### Added
+- Name tonight's first leftover sit-out on the ready rehearsal map and tell returning parts to play without waiting, or the leftover part to stay out.
- 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.
- 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..964b0a6f8 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 and tonight's first leftover sit-out after a partial return. `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..4ed4e013a 100644
--- a/apps/desktop/src/features/workspace/Workspace.test.tsx
+++ b/apps/desktop/src/features/workspace/Workspace.test.tsx
@@ -196,6 +196,82 @@ describe("Workspace", () => {
);
});
+ it("names tonight's first leftover sit-out after a partial return", () => {
+ setNavigatorLanguage("en-US");
+ const song = createDemoRehearsalSong();
+ const verse = song.sections[0]!;
+ song.sections = [
+ {
+ ...verse,
+ partGraph: verse.partGraph.map((node) =>
+ node.role_id === "bass-guitar" || node.role_id === "keys-right"
+ ? { ...node, is_active: false }
+ : node
+ )
+ },
+ {
+ ...verse,
+ id: "chorus-1",
+ label: "chorus",
+ timeRange: { start: verse.timeRange.end, end: verse.timeRange.end + 20 },
+ partGraph: verse.partGraph.map((node) =>
+ node.role_id === "keys-right" ? { ...node, is_active: false } : node
+ )
+ }
+ ];
+
+ render();
+
+ const callout = screen.getByTestId("first-leftover");
+ expect(callout).toHaveTextContent("Tonight's first leftover sit-out");
+ expect(callout).toHaveTextContent(
+ "Keyboard 1 Right Hand stays tacet in chorus after verse. Play chorus without waiting for Keyboard 1 Right Hand."
+ );
+ });
+
+ it("tells the leftover part to stay out of the partial return", () => {
+ setNavigatorLanguage("en-US");
+ const song = createDemoRehearsalSong();
+ const verse = song.sections[0]!;
+ song.sections = [
+ {
+ ...verse,
+ partGraph: verse.partGraph.map((node) =>
+ node.role_id === "bass-guitar" || node.role_id === "keys-right"
+ ? { ...node, is_active: false }
+ : node
+ )
+ },
+ {
+ ...verse,
+ id: "chorus-1",
+ label: "chorus",
+ timeRange: { start: verse.timeRange.end, end: verse.timeRange.end + 20 },
+ partGraph: verse.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-leftover")).toHaveTextContent(
+ "Keyboard 1 Right Hand stays tacet in chorus after verse. Stay out of chorus."
+ );
+ });
+
+ it("asks the player to confirm the leftover sit-out when every part stays active", () => {
+ setNavigatorLanguage("en-US");
+ const song = createDemoRehearsalSong();
+
+ render();
+
+ expect(screen.getByTestId("first-leftover")).toHaveTextContent(
+ "Tonight's first leftover sit-out still needs a named part that stays out after others return. Confirm who stays tacet before the first section."
+ );
+ });
+
it("falls back from blank planning copy and tolerates partial collaboration payloads", () => {
setNavigatorLanguage("en-US");
const song = createDemoRehearsalSong();
diff --git a/apps/desktop/src/features/workspace/Workspace.tsx b/apps/desktop/src/features/workspace/Workspace.tsx
index d44e20777..aafe5a93e 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 { firstLeftover } from "./firstLeftover";
import { createTranslator, detectPreferredLocale } from "../../i18n";
import { generateCueSheetCsv, generateChartSummaryJson, generateMetadataHandoffJson, sanitizeFilename } from "../../lib/export";
import { Button } from "@/components/ui/button";
@@ -163,6 +164,21 @@ export function Workspace({ song, sourceBootstrap = null, onSongUpdate }: Worksp
}
)
: t("workspaceFirstRangeMissing");
+ const namedLeftover = useMemo(() => firstLeftover(song, activeRole), [activeRole, song]);
+ const firstLeftoverCopy = namedLeftover
+ ? fillRangeCopy(
+ t(
+ activeRole && activeRole === namedLeftover.leftoverRoleId
+ ? "workspaceFirstLeftoverStayOut"
+ : "workspaceFirstLeftoverNamed"
+ ),
+ {
+ leftoverRoleName: namedLeftover.leftoverRoleName,
+ sectionLabel: namedLeftover.sectionLabel,
+ fromSectionLabel: namedLeftover.fromSectionLabel
+ }
+ )
+ : t("workspaceFirstLeftoverMissing");
/** Handle the practice progress change internally by immutably updating the song state. */
const handlePracticeProgressChange = (newProgress: number) => {
@@ -309,6 +325,14 @@ export function Workspace({ song, sourceBootstrap = null, onSongUpdate }: Worksp
{t("workspaceFirstRangeTitle")}
{firstRangeCopy}
+
+ {t("workspaceFirstLeftoverTitle")}
+ {firstLeftoverCopy}
+
diff --git a/apps/desktop/src/features/workspace/firstLeftover.selected-role.test.ts b/apps/desktop/src/features/workspace/firstLeftover.selected-role.test.ts
new file mode 100644
index 000000000..d200a77b2
--- /dev/null
+++ b/apps/desktop/src/features/workspace/firstLeftover.selected-role.test.ts
@@ -0,0 +1,51 @@
+import { createDemoRehearsalSong, type RehearsalSong } from "@bandscope/shared-types";
+import { describe, expect, it } from "vitest";
+import { firstLeftover } from "./firstLeftover";
+
+function sectionWithInactiveRoles(
+ template: RehearsalSong["sections"][number],
+ id: string,
+ label: RehearsalSong["sections"][number]["label"],
+ start: number,
+ inactiveRoleIds: readonly string[]
+): RehearsalSong["sections"][number] {
+ const inactive = new Set(inactiveRoleIds);
+ return {
+ ...template,
+ id,
+ label,
+ timeRange: { start, end: start + 20 },
+ partGraph: template.partGraph.map((node) => ({
+ ...node,
+ is_active: !inactive.has(node.role_id)
+ }))
+ };
+}
+
+describe("firstLeftover selected-role search", () => {
+ it("keeps searching after the selected part newly drops out during an earlier partial return", () => {
+ const seed = createDemoRehearsalSong();
+ const template = seed.sections[0]!;
+ const song: RehearsalSong = {
+ ...seed,
+ sections: [
+ sectionWithInactiveRoles(template, "verse-1", "verse", 0, [
+ "bass-guitar",
+ "keys-right"
+ ]),
+ sectionWithInactiveRoles(template, "chorus-1", "chorus", 20, [
+ "lead-vocal",
+ "keys-right"
+ ]),
+ sectionWithInactiveRoles(template, "bridge-1", "bridge", 40, ["keys-right"])
+ ]
+ };
+
+ expect(firstLeftover(song, "lead-vocal")).toEqual({
+ sectionLabel: "bridge",
+ fromSectionLabel: "verse",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+ });
+});
diff --git a/apps/desktop/src/features/workspace/firstLeftover.test.ts b/apps/desktop/src/features/workspace/firstLeftover.test.ts
new file mode 100644
index 000000000..4d3392f84
--- /dev/null
+++ b/apps/desktop/src/features/workspace/firstLeftover.test.ts
@@ -0,0 +1,355 @@
+import { createDemoRehearsalSong, type RehearsalSong } from "@bandscope/shared-types";
+import { describe, expect, it } from "vitest";
+import { fillRangeCopy } from "./firstRangeSqueeze";
+import { firstLeftover } from "./firstLeftover";
+
+function withChorus(song: RehearsalSong): RehearsalSong {
+ const verse = song.sections[0]!;
+ const chorus = {
+ ...verse,
+ id: "chorus-1",
+ label: "chorus" as RehearsalSong["sections"][number]["label"],
+ timeRange: {
+ start: verse.timeRange.end,
+ end: verse.timeRange.end + 20
+ }
+ };
+ return { ...song, sections: [verse, chorus] };
+}
+
+function withPartialReturn(
+ song: RehearsalSong,
+ returningRoleId: string,
+ leftoverRoleId: string,
+ leftoverActive: boolean | "omit" = false
+): RehearsalSong {
+ const twoSection = withChorus(song);
+ return {
+ ...twoSection,
+ sections: twoSection.sections.map((section, index) => ({
+ ...section,
+ partGraph: section.partGraph.map((node) => {
+ if (index === 0) {
+ if (node.role_id === returningRoleId || node.role_id === leftoverRoleId) {
+ return { ...node, is_active: false };
+ }
+ return node;
+ }
+ if (node.role_id === leftoverRoleId) {
+ if (leftoverActive === "omit") {
+ const rest: Record = {
+ role_id: node.role_id,
+ handoff_to: node.handoff_to,
+ handoff_from: node.handoff_from
+ };
+ return rest as RehearsalSong["sections"][number]["partGraph"][number];
+ }
+ return { ...node, is_active: leftoverActive };
+ }
+ return node;
+ })
+ }))
+ };
+}
+
+function sectionWithInactiveRoles(
+ template: RehearsalSong["sections"][number],
+ id: string,
+ label: string,
+ start: number,
+ inactiveRoleIds: readonly string[],
+ activeOnlyRoles = false
+): RehearsalSong["sections"][number] {
+ const inactive = new Set(inactiveRoleIds);
+ const partGraph = template.partGraph.map((node) => ({
+ ...node,
+ is_active: !inactive.has(node.role_id)
+ }));
+ return {
+ ...template,
+ id,
+ label: label as RehearsalSong["sections"][number]["label"],
+ timeRange: { start, end: start + 20 },
+ partGraph,
+ roles: activeOnlyRoles
+ ? template.roles.filter((role) => !inactive.has(role.id))
+ : template.roles
+ };
+}
+
+describe("firstLeftover", () => {
+ it("returns null on the demo song where every graph node is active", () => {
+ expect(firstLeftover(createDemoRehearsalSong())).toBeNull();
+ expect(firstLeftover(withChorus(createDemoRehearsalSong()))).toBeNull();
+ });
+
+ it("names the leftover sit-out after a partial return", () => {
+ expect(
+ firstLeftover(withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right"))
+ ).toEqual({
+ sectionLabel: "chorus",
+ fromSectionLabel: "verse",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+ });
+
+ it("uses song-wide role names when inactive analysis roles are omitted from section roles", () => {
+ const seed = createDemoRehearsalSong();
+ const template = seed.sections[0]!;
+ const song: RehearsalSong = {
+ ...seed,
+ sections: [
+ sectionWithInactiveRoles(template, "opening-1", "opening", 0, []),
+ sectionWithInactiveRoles(
+ template,
+ "bridge-1",
+ "bridge",
+ 20,
+ ["bass-guitar", "keys-right"],
+ true
+ ),
+ sectionWithInactiveRoles(template, "chorus-1", "chorus", 40, ["keys-right"], true)
+ ]
+ };
+
+ expect(firstLeftover(song)).toEqual({
+ sectionLabel: "chorus",
+ fromSectionLabel: "bridge",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+ });
+
+ it("treats repeated form labels as distinct timeline sections", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right");
+ song.sections[1] = {
+ ...song.sections[1]!,
+ label: song.sections[0]!.label
+ };
+
+ expect(firstLeftover(song)).toEqual({
+ sectionLabel: "verse",
+ fromSectionLabel: "verse",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+ });
+
+ it("starts a new reduction baseline after the prior sit-outs fully return", () => {
+ const seed = createDemoRehearsalSong();
+ const template = seed.sections[0]!;
+ const song: RehearsalSong = {
+ ...seed,
+ sections: [
+ sectionWithInactiveRoles(template, "verse-1", "verse", 0, ["lead-vocal"]),
+ sectionWithInactiveRoles(template, "chorus-1", "chorus", 20, []),
+ sectionWithInactiveRoles(template, "bridge-1", "bridge", 40, ["bass-guitar", "keys-right"]),
+ sectionWithInactiveRoles(template, "outro-1", "outro", 60, ["keys-right"])
+ ]
+ };
+
+ expect(firstLeftover(song)).toEqual({
+ sectionLabel: "outro",
+ fromSectionLabel: "bridge",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+ });
+
+ it("fails closed on contradictory duplicate graph identities", () => {
+ for (const reverse of [false, true]) {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right");
+ const section = song.sections[1]!;
+ const keysNode = section.partGraph.find((node) => node.role_id === "keys-right")!;
+ const withoutKeys = section.partGraph.filter((node) => node.role_id !== "keys-right");
+ const inactiveKeys = { ...keysNode, is_active: false };
+ const activeKeys = { ...keysNode, is_active: true };
+ song.sections[1] = {
+ ...section,
+ partGraph: [
+ ...withoutKeys,
+ ...(reverse ? [activeKeys, inactiveKeys] : [inactiveKeys, activeKeys])
+ ]
+ };
+
+ expect(firstLeftover(song)).toBeNull();
+ }
+ });
+
+ it("skips blank leftover labels until a named partial return exists", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right");
+ song.sections[1] = {
+ ...song.sections[1]!,
+ label: "none" as RehearsalSong["sections"][number]["label"]
+ };
+ expect(firstLeftover(song)).toBeNull();
+ });
+
+ it("keeps the selected active part on tonight's first leftover", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right");
+ expect(firstLeftover(song, "keys-right")).toEqual({
+ sectionLabel: "chorus",
+ fromSectionLabel: "verse",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+ expect(firstLeftover(song, "bass-guitar")).toEqual({
+ sectionLabel: "chorus",
+ fromSectionLabel: "verse",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+ expect(firstLeftover(song, "missing-role")).toBeNull();
+ });
+
+ it("keeps a selected inactive part from receiving a play instruction", () => {
+ const seed = createDemoRehearsalSong();
+ const template = seed.sections[0]!;
+ const reduction = sectionWithInactiveRoles(
+ template,
+ "verse-1",
+ "verse",
+ 0,
+ ["bass-guitar", "lead-vocal", "keys-right"]
+ );
+ const partial = sectionWithInactiveRoles(
+ template,
+ "chorus-1",
+ "chorus",
+ 20,
+ ["lead-vocal", "keys-right"]
+ );
+ partial.partGraph = [
+ ...partial.partGraph.filter((node) => node.role_id === "lead-vocal"),
+ ...partial.partGraph.filter(
+ (node) => node.role_id !== "lead-vocal" && node.role_id !== "keys-right"
+ ),
+ ...partial.partGraph.filter((node) => node.role_id === "keys-right")
+ ];
+ const song: RehearsalSong = { ...seed, sections: [reduction, partial] };
+
+ expect(firstLeftover(song, "keys-right")).toEqual({
+ sectionLabel: "chorus",
+ fromSectionLabel: "verse",
+ leftoverRoleId: "keys-right",
+ leftoverRoleName: "Keyboard 1 Right Hand"
+ });
+
+ const newDropout: RehearsalSong = {
+ ...seed,
+ sections: [
+ sectionWithInactiveRoles(template, "verse-1", "verse", 0, ["bass-guitar", "keys-right"]),
+ sectionWithInactiveRoles(template, "chorus-1", "chorus", 20, ["lead-vocal", "keys-right"])
+ ]
+ };
+ expect(firstLeftover(newDropout, "lead-vocal")).toBeNull();
+ });
+
+ it("ignores inherited is_active evidence", () => {
+ const song = withChorus(createDemoRehearsalSong());
+ const inherited = Object.create({
+ is_active: false,
+ role_id: "keys-right"
+ }) as RehearsalSong["sections"][number]["partGraph"][number];
+ song.sections[0] = {
+ ...song.sections[0]!,
+ partGraph: [inherited, ...song.sections[0]!.partGraph]
+ };
+ expect(firstLeftover(song)).toBeNull();
+ });
+
+ it("does not treat a missing is_active flag as a leftover", () => {
+ expect(
+ firstLeftover(withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right", "omit"))
+ ).toBeNull();
+ });
+
+ it("does not treat a continued sit-out with nobody returning as a leftover", () => {
+ const song = withChorus(createDemoRehearsalSong());
+ song.sections = song.sections.map((section) => ({
+ ...section,
+ partGraph: section.partGraph.map((node) =>
+ node.role_id === "keys-right" ? { ...node, is_active: false } : node
+ )
+ }));
+ expect(firstLeftover(song)).toBeNull();
+ });
+
+ it("does not treat a full-band return as a leftover", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right", true);
+ expect(firstLeftover(song)).toBeNull();
+ });
+
+ it("does not treat a new dropout after every original sit-out returns as a leftover", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right", true);
+ song.sections[1] = {
+ ...song.sections[1]!,
+ partGraph: song.sections[1]!.partGraph.map((node) =>
+ node.role_id === "lead-vocal" ? { ...node, is_active: false } : node
+ )
+ };
+ expect(firstLeftover(song)).toBeNull();
+ });
+
+ it("fails closed when the later section has no named leftover role", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right");
+ song.sections[1] = {
+ ...song.sections[1]!,
+ roles: song.sections[1]!.roles.map((role) => ({ ...role, name: " " }))
+ };
+ expect(firstLeftover(song)).toBeNull();
+ });
+
+ it("fails closed when the later section has no named graph", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right");
+ song.sections[1] = {
+ ...song.sections[1]!,
+ partGraph: []
+ };
+ expect(firstLeftover(song)).toBeNull();
+ });
+
+ it("fails closed on malformed runtime roots", () => {
+ for (const malformed of [null, {}, { sections: {} }, { sections: [null] }]) {
+ expect(firstLeftover(malformed as unknown as RehearsalSong)).toBeNull();
+ }
+ });
+
+ it("isolates blank role ids, non-boolean flags, and unnamed graph members", () => {
+ const song = withPartialReturn(createDemoRehearsalSong(), "bass-guitar", "keys-right");
+ song.sections[0] = {
+ ...song.sections[0]!,
+ partGraph: [
+ { role_id: " ", is_active: false, handoff_to: [], handoff_from: [] },
+ { role_id: "ghost", is_active: false, handoff_to: [], handoff_from: [] },
+ { role_id: "keys-right", is_active: "no" as unknown as boolean, handoff_to: [], handoff_from: [] },
+ ...song.sections[0]!.partGraph
+ ]
+ };
+ const inheritedId = Object.create({ id: "keys-right", name: "Inherited Keys" });
+ song.sections[0] = {
+ ...song.sections[0]!,
+ roles: [inheritedId as RehearsalSong["sections"][number]["roles"][number], ...song.sections[0]!.roles]
+ };
+ expect(
+ firstLeftover({
+ ...song,
+ sections: [song.sections[0]!, { ...song.sections[1]!, roles: "broken" as unknown as RehearsalSong["sections"][number]["roles"] }]
+ })
+ ).toBeNull();
+ expect(firstLeftover({ ...song, sections: [song.sections[0]!, { ...song.sections[1]!, partGraph: null }] })).toBeNull();
+ });
+});
+
+describe("leftover copy filling", () => {
+ it("keeps rehearsal values literal", () => {
+ expect(
+ fillRangeCopy("{leftoverRoleName} stays tacet in {sectionLabel} after {fromSectionLabel}.", {
+ leftoverRoleName: "Keyboard 1 Right Hand {sectionLabel}",
+ sectionLabel: "chorus",
+ fromSectionLabel: "verse"
+ })
+ ).toBe("Keyboard 1 Right Hand {sectionLabel} stays tacet in chorus after verse.");
+ });
+});
diff --git a/apps/desktop/src/features/workspace/firstLeftover.ts b/apps/desktop/src/features/workspace/firstLeftover.ts
new file mode 100644
index 000000000..312c66c61
--- /dev/null
+++ b/apps/desktop/src/features/workspace/firstLeftover.ts
@@ -0,0 +1,220 @@
+import type { RehearsalSong } from "@bandscope/shared-types";
+import { meaningfulRangeText } from "./firstRangeSqueeze";
+
+/** Tonight's first named leftover sit-out after a partial return. */
+export type FirstLeftover = {
+ sectionLabel: string;
+ fromSectionLabel: string;
+ leftoverRoleId: string;
+ leftoverRoleName: string;
+};
+
+/** 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);
+}
+
+/** Admit an own-property boolean `is_active` flag. Inherited evidence is isolated. */
+function ownActiveFlag(value: Record): boolean | null {
+ if (!Object.prototype.hasOwnProperty.call(value, "is_active")) {
+ return null;
+ }
+ if (value.is_active === true) {
+ return true;
+ }
+ if (value.is_active === false) {
+ return false;
+ }
+ return null;
+}
+
+type NamedRoleCatalog = Map;
+
+/**
+ * Build trustworthy role identity evidence across the whole song.
+ *
+ * Production analysis emits active-only section `roles` while keeping inactive
+ * identities in `partGraph`. The song-wide catalog therefore lets a role keep
+ * its trustworthy display name across sections without treating inherited,
+ * blank, duplicate, or contradictory metadata as authority.
+ */
+function namedSongRoles(songValue: Record): NamedRoleCatalog | null {
+ if (!Array.isArray(songValue.sections)) {
+ return null;
+ }
+
+ const namedRoles: NamedRoleCatalog = new Map();
+ for (const sectionValue of songValue.sections) {
+ if (!isRuntimeObject(sectionValue) || !Array.isArray(sectionValue.roles)) {
+ return null;
+ }
+
+ const sectionRoleIds = new Set();
+ for (const roleValue of sectionValue.roles) {
+ if (
+ !isRuntimeObject(roleValue) ||
+ !Object.prototype.hasOwnProperty.call(roleValue, "id") ||
+ !Object.prototype.hasOwnProperty.call(roleValue, "name")
+ ) {
+ return null;
+ }
+
+ const roleId = meaningfulRangeText(roleValue.id);
+ const roleName = meaningfulRangeText(roleValue.name);
+ if (!roleId || !roleName || sectionRoleIds.has(roleId)) {
+ return null;
+ }
+ sectionRoleIds.add(roleId);
+
+ const knownName = namedRoles.get(roleId);
+ if (knownName && knownName !== roleName) {
+ return null;
+ }
+ namedRoles.set(roleId, roleName);
+ }
+ }
+
+ return namedRoles.size > 0 ? namedRoles : null;
+}
+
+type NamedGraphNode = {
+ roleId: string;
+ active: boolean;
+};
+
+/**
+ * Collect one complete, unique activity record for every song-wide named role.
+ *
+ * Missing, unknown, duplicate, inherited, or non-boolean graph evidence fails
+ * closed so one part can never satisfy both the returning and leftover sides of
+ * the same transition.
+ */
+function namedGraphNodes(
+ sectionValue: Record,
+ namedRoles: NamedRoleCatalog
+): NamedGraphNode[] | null {
+ if (!Array.isArray(sectionValue.partGraph)) {
+ return null;
+ }
+
+ const nodes: NamedGraphNode[] = [];
+ const seenRoleIds = new Set();
+ for (const nodeValue of sectionValue.partGraph) {
+ if (
+ !isRuntimeObject(nodeValue) ||
+ !Object.prototype.hasOwnProperty.call(nodeValue, "role_id")
+ ) {
+ return null;
+ }
+
+ const roleId = meaningfulRangeText(nodeValue.role_id);
+ if (!roleId || !namedRoles.has(roleId) || seenRoleIds.has(roleId)) {
+ return null;
+ }
+
+ const active = ownActiveFlag(nodeValue);
+ if (active === null) {
+ return null;
+ }
+
+ seenRoleIds.add(roleId);
+ nodes.push({ roleId, active });
+ }
+
+ return seenRoleIds.size === namedRoles.size ? nodes : null;
+}
+
+/**
+ * Pick the first leftover sit-out a player should honor after others return.
+ *
+ * Uses song-wide role identity plus complete `partGraph` activity evidence. A
+ * leftover is the first later named section where at least one member of the
+ * current reduced cohort has returned and at least one remains out. A complete
+ * return closes that cohort; a new sit-out in the same or a later section can
+ * establish the next reduction baseline. Section labels remain display data,
+ * so repeated form labels never collapse distinct timeline positions.
+ *
+ * Inherited/missing activity, incomplete or contradictory graphs, unnamed
+ * roles, and malformed runtime data fail closed. When a role is selected, a
+ * selected inactive part is shown only when it is itself a leftover from the
+ * tracked reduced cohort, so the workspace never tells a silent part to play.
+ */
+export function firstLeftover(
+ song: RehearsalSong | unknown,
+ activeRole: string | null = null
+): FirstLeftover | null {
+ if (!isRuntimeObject(song) || !Array.isArray(song.sections)) {
+ return null;
+ }
+
+ const namedRoles = namedSongRoles(song);
+ if (!namedRoles || (activeRole && !namedRoles.has(activeRole))) {
+ return null;
+ }
+
+ let reducedFrom: string | null = null;
+ let sittingOutIds: Set | null = null;
+
+ for (const sectionValue of song.sections) {
+ if (!isRuntimeObject(sectionValue)) {
+ return null;
+ }
+ const sectionLabel = meaningfulRangeText(sectionValue.label);
+ if (!sectionLabel) {
+ continue;
+ }
+
+ const nodes = namedGraphNodes(sectionValue, namedRoles);
+ if (!nodes) {
+ return null;
+ }
+
+ const sittingOut = nodes.filter((node) => node.active === false);
+ if (!sittingOutIds || !reducedFrom) {
+ if (sittingOut.length === 0) {
+ continue;
+ }
+ reducedFrom = sectionLabel;
+ sittingOutIds = new Set(sittingOut.map((node) => node.roleId));
+ continue;
+ }
+
+ const baselineIds = sittingOutIds;
+ const returning = nodes.filter(
+ (node) => node.active === true && baselineIds.has(node.roleId)
+ );
+ const leftovers = sittingOut.filter((node) => baselineIds.has(node.roleId));
+
+ if (returning.length > 0 && leftovers.length > 0) {
+ let leftover = leftovers[0]!;
+ if (activeRole) {
+ const activeRoleNode = nodes.find((node) => node.roleId === activeRole)!;
+ if (!activeRoleNode.active) {
+ const selectedLeftover = leftovers.find((node) => node.roleId === activeRole);
+ if (!selectedLeftover) {
+ continue;
+ }
+ leftover = selectedLeftover;
+ }
+ }
+ return {
+ sectionLabel,
+ fromSectionLabel: reducedFrom,
+ leftoverRoleId: leftover.roleId,
+ leftoverRoleName: namedRoles.get(leftover.roleId)!
+ };
+ }
+
+ if (returning.length === baselineIds.size && leftovers.length === 0) {
+ if (sittingOut.length === 0) {
+ reducedFrom = null;
+ sittingOutIds = null;
+ } else {
+ reducedFrom = sectionLabel;
+ sittingOutIds = new Set(sittingOut.map((node) => node.roleId));
+ }
+ }
+ }
+
+ return null;
+}
diff --git a/apps/desktop/src/i18n/index.test.ts b/apps/desktop/src/i18n/index.test.ts
index dc49a0a25..dbbd7d1f4 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("workspaceFirstLeftoverTitle")).toBe("오늘 먼저 남을 쉬는 자리");
});
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..6af5075b8 100644
--- a/apps/desktop/src/locales/en/common.json
+++ b/apps/desktop/src/locales/en/common.json
@@ -153,6 +153,10 @@
"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.",
+ "workspaceFirstLeftoverTitle": "Tonight's first leftover sit-out",
+ "workspaceFirstLeftoverNamed": "{leftoverRoleName} stays tacet in {sectionLabel} after {fromSectionLabel}. Play {sectionLabel} without waiting for {leftoverRoleName}.",
+ "workspaceFirstLeftoverStayOut": "{leftoverRoleName} stays tacet in {sectionLabel} after {fromSectionLabel}. Stay out of {sectionLabel}.",
+ "workspaceFirstLeftoverMissing": "Tonight's first leftover sit-out still needs a named part that stays out after others return. Confirm who stays tacet before the first section.",
"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..c6bf81c1b 100644
--- a/apps/desktop/src/locales/ko/common.json
+++ b/apps/desktop/src/locales/ko/common.json
@@ -153,6 +153,10 @@
"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.",
+ "workspaceFirstLeftoverTitle": "오늘 먼저 남을 쉬는 자리",
+ "workspaceFirstLeftoverNamed": "{leftoverRoleName}은 {fromSectionLabel} 다음 {sectionLabel}에서 그대로 쉽니다. 그 파트를 기다리지 말고 {sectionLabel}부터 연주하세요.",
+ "workspaceFirstLeftoverStayOut": "{leftoverRoleName}은 {fromSectionLabel} 다음 {sectionLabel}에서 그대로 쉽니다. {sectionLabel}에는 들어오지 마세요.",
+ "workspaceFirstLeftoverMissing": "오늘 먼저 남을 쉬는 자리는 아직 확인이 필요합니다. 다른 파트가 돌아온 뒤에도 쉬는 파트를 첫 구간 전에 확인하세요.",
"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..c755d9004 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 leftover sit-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-leftover.md b/docs/doctoring/first-leftover.md
new file mode 100644
index 000000000..eaecc2895
--- /dev/null
+++ b/docs/doctoring/first-leftover.md
@@ -0,0 +1,18 @@
+# Tonight's first leftover sit-out
+
+The ready rehearsal map names the first leftover sit-out from existing `partGraph` evidence: a named section where at least one previously sitting-out named part is own-property active and at least one previously sitting-out named part is still own-property tacet. This is where the returning parts should play without waiting, and the leftover part should stay out. It is not a come-in, tacet, dropout, tutti, handoff, Fine, last-line breath, a continued sit-out with nobody returning, or a new dropout after every original sit-out returns.
+
+## Next action
+
+- Named returning part: play the named section without waiting for the leftover part.
+- Named leftover part: stay tacet through the named section after the reduced earlier section.
+- Missing: confirm who stays tacet after others return before the first section.
+
+## Security Notes
+
+- Untrusted inputs: `RehearsalSong` JSON, section labels, `partGraph` nodes, `is_active`, role ids, and role names 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 an own-property sit-out on a named section followed by a later named section with a partial return and a leftover sit-out.
+- Allowlist: section labels and role names must be meaningful text. A missing graph node is not a leftover. Inherited `is_active` is isolated. Same-section false-then-true nodes are not a return. All-active later sections are tuttis, not leftovers. Continued sit-outs with nobody returning are not leftovers. A new dropout after every original sit-out returns is a dropout, not a leftover. When a role is selected, only a leftover section that includes that named part is shown.
+- Safe failure: inherited flags, blank labels, missing names, full-band returns, continued sit-outs, new dropouts after a full original return, and malformed roots return `null` so the workspace shows the missing-copy next action instead of crashing or inventing a leftover.
+- Logging/privacy: rejected or accepted leftovers are not logged. Copy interpolation keeps rehearsal values literal.
+- Tests: `firstLeftover.test.ts` and the Workspace callout cover the demo all-active case, an explicit bass return with keys leftover, selected-role scoping, inherited flags, missing `is_active`, continued sit-outs, full-band returns, new dropouts after a full original return, unnamed roles, empty graphs, and literal copy filling.