diff --git a/AGENTS.md b/AGENTS.md
index fca448ce9..92cee4ff4 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -83,6 +83,7 @@ This section applies to any agent (Claude, Codex, Cursor, opencode, ...) working
- Keep UI and analysis engine decoupled through shared contracts.
- Prefer minimal, test-first changes for production code.
- Prefer practical, friendly, rehearsal-first wording over academic or authority-heavy language.
+- After a part is selected, Loop must name tonight's practice window (section + time, tempo when known) and open that section. Do not leave Loop as coming soon while Play stem stays unavailable.
- Do not reduce the product to a chord analyzer when form, timing, player coordination, simplification, and setup cues are the real rehearsal blockers.
- Do not frame usability as a reason to accept weak analysis quality; BandScope should aim for both easy use and high accuracy.
diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index 3302a6fc3..0d467f6c2 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -68,6 +68,7 @@ Last updated: 2026-03-11
- BandScope is not only a shell around chord labels, stems, and ranges.
- The technical scope includes rehearsal-facing outputs for harmony, section roadmap, groove cues, role entry and dropout cues, simplification guidance, transposition or setup guidance, confidence flags, and rehearsal priority.
- These outputs must stay aligned with `docs/brand-story.md` rather than drifting back to a song-summary-only analyzer.
+- After a part is selected, the stem-player Loop control must name tonight's practice window and open that section on the roadmap. Play stem stays unavailable until Stem Lab exists.
## Analysis target model
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eea696893..5c4c8f399 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
### Added
+- After a part is selected, Loop names tonight's practice window (section, time range, tempo when known) and opens that section. Timeline cells and section cards do the same instead of sitting as dead descriptions; section navigation also honors the system reduced-motion preference instead of forcing smooth scrolling.
- 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.
@@ -65,4 +66,4 @@
- `ChordsFeature` (코드 분석) 화면에서 각 파트(Role)의 `transpositionPlan`(이조/조옮김 계획)을 표시하는 기능을 추가했습니다.
- `RangesFeature` (음역대 분석) 화면에서 겹침 경고(Overlap warning) 외에 해당 파트의 채보(Transcription) 가능 노드 수를 요약하여 보여주는 기능을 추가했습니다.
-- 신규 UI 요소에 대한 100% 테스트 커버리지를 보장하는 단위 테스트를 추가했습니다 (`apps/desktop/src/features/chords/index.test.tsx`, `apps/desktop/src/features/ranges/index.test.tsx`).
+- 신규 UI 요소에 대한 100% 테스트 커버리지를 보장하는 단위 테스트를 추가했습니다 (`apps/desktop/src/features/chords/index.test.tsx`, `apps/desktop/src/features/ranges/index.test.tsx`).
\ No newline at end of file
diff --git a/CLAUDE.md b/CLAUDE.md
index 82c2c704a..71fbacbe6 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -6,6 +6,8 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
`AGENTS.md` is the canonical agent operating guide — read and follow it before making changes. It defines the security workflow (`Security Notes`), supply-chain workflow, cross-platform build rules, GitHub bootstrap rules, code style, and safety guardrails. This file complements it with commands and architecture; when in doubt, `AGENTS.md` and the docs it references win.
+After a part is selected, Loop must name tonight's practice window and open that section. Do not leave that control as a coming-soon dead end.
+
Agent execution and delegation rules live in `docs/agents/README.md`. PR canonicalization rules live in `docs/workflow/pr-continuity.md`.
## Common commands
diff --git a/apps/desktop/src/features/workspace/SectionRoadmap.test.tsx b/apps/desktop/src/features/workspace/SectionRoadmap.test.tsx
index 75a199246..fd11dc332 100644
--- a/apps/desktop/src/features/workspace/SectionRoadmap.test.tsx
+++ b/apps/desktop/src/features/workspace/SectionRoadmap.test.tsx
@@ -60,4 +60,16 @@ describe("SectionRoadmap", () => {
expect(onSongUpdate).not.toHaveBeenCalled();
});
+
+ it("names a focusable practice window on each section card", () => {
+ setNavigatorLanguage("en-US");
+ const song = createDemoRehearsalSong();
+
+ render();
+
+ const card = document.getElementById("workspace-section-verse-1");
+ expect(card).toBeTruthy();
+ expect(card?.getAttribute("tabindex")).toBe("-1");
+ expect(screen.getByRole("button", { name: "Practice verse 0:10–0:30" })).toBeTruthy();
+ });
});
diff --git a/apps/desktop/src/features/workspace/SectionRoadmap.tsx b/apps/desktop/src/features/workspace/SectionRoadmap.tsx
index 6f27c2509..6e45710fb 100644
--- a/apps/desktop/src/features/workspace/SectionRoadmap.tsx
+++ b/apps/desktop/src/features/workspace/SectionRoadmap.tsx
@@ -6,6 +6,7 @@ import { Card, CardContent, CardHeader } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Separator } from "@/components/ui/separator";
import { AlertCircle, CheckCircle2, Music2, Wand2, Lightbulb, Info } from "lucide-react";
+import { Button } from "@/components/ui/button";
interface SectionRoadmapProps {
song: RehearsalSong;
@@ -13,6 +14,16 @@ interface SectionRoadmapProps {
onSongUpdate?: (song: RehearsalSong) => void;
}
+/** Documented. */
+function formatTimelineTime(totalSeconds: number): string {
+ const safeSeconds = Number.isFinite(totalSeconds) && totalSeconds >= 0 ? totalSeconds : 0;
+ const minutes = Math.floor(safeSeconds / 60);
+ const seconds = Math.floor(safeSeconds % 60)
+ .toString()
+ .padStart(2, "0");
+ return `${minutes}:${seconds}`;
+}
+
/** Documented. */
export function SectionRoadmap({ song, activeRole, onSongUpdate }: SectionRoadmapProps) {
const sectionRoadmapTitleId = useId();
@@ -103,10 +114,17 @@ export function SectionRoadmap({ song, activeRole, onSongUpdate }: SectionRoadma
tabIndex={0}
aria-labelledby={sectionRoadmapTitleId}
>
- {song.sections.map((section) => (
+ {song.sections.map((section) => {
+ const window = `${formatTimelineTime(section.timeRange.start)}–${formatTimelineTime(section.timeRange.end)}`;
+ const practiceLabel = t("workspacePracticeWindowAction")
+ .replaceAll("{section}", section.label)
+ .replaceAll("{window}", window);
+ return (
@@ -119,6 +137,22 @@ export function SectionRoadmap({ song, activeRole, onSongUpdate }: SectionRoadma
{t("sectionGrooveLabel")}
{section.groove}
+