implement

name	implement
description	Implement a piece of work from a spec or tickets. Use when the user asks to implement, build, code, or ship a feature/ticket — especially feature UI, navigation, or data layers. Mandates /structure-feature-code for screen shape.
disable-model-invocation	true

Implement

Implement the work described by the user in the spec or tickets.

Mandatory before coding feature UI / navigation

Open and follow structure-feature-code end-to-end. For busy screens also open docs/agents/screen-context.md. Do not invent a different screen shape.

Presentation non-negotiables (do these first; do not “fix later”)

1. Package layout — ViewModel (state-only) · Screen · ui/ · logic/ · presentation/preview/*Previews.kt. Busy screens add *ScreenContext (see screen-context doc).
2. No logic bodies in @Composable screens — observe/map/menu/delete/install/navigate live in logic/ as top-level (or context-extension) functions. The Screen only wires resources and calls them. Reference: BuildProgressScreen + progress/logic/, BuildHistoryListScreen / BuildHistoryDetailScreen + history/logic/.
3. Inner-screen host = thin NavHost — list ↔ detail ↔ progress (or similar) is AnimatedContent + route enum + child screen calls only — same shape as ProjectsNavHost / SettingsScreen / BuildHistoryScreen. No observe/menu/install code in the host file.
4. Flat *UiState data class — isLoading, loadError (or equivalent flags), plus content fields. Same shape as EditorUiState / BuildHistoryDetailUiState. Never sealed Loading / Ready / Failed for screen UI state. Content: when { state.isLoading → …; state.loadError != null → …; else → … }.
5. Load + error are first-class — async screens show Loading, a user-safe load error (with retry when useful), and not-found/empty when the resource is gone. Do not leave a blank composable or silently pop on first null from collectAsState(initial = null).
6. No nested fun — project-wide (AGENTS.md → Coding rules). No mega *Content(…onA, onB, onC…) callback tables.
7. Previews — multi-state cases in presentation/preview/ only; call the real Screen/Content.

Data / ports (when the ticket adds seams)

1. Logic owns ports (interfaces + domain types); Room / network / filesystem are *Adapter types with that word in the name (e.g. RoomBuildJobRepositoryAdapter).
2. Feature services wire adapters; history/list stores must not depend on services they don’t need.
3. Cross-feature hooks: producer-owned registry in :api — consumers register themselves (no Koin getAll() multi-bind for listeners).

Ticket / UX gates

Before coding UI/navigation work, read the ticket’s acceptance criteria against docs/agents/writing-acceptance-criteria.md. If the ticket is thin (e.g. missing system Back or designed primary affordances), add those criteria to the issue (comment or edit) before treating them as optional — do not silently ship toolbar-only behaviour.

UI source of truth is :designsystem + Compose (docs/design-system.md). Do not sync to Figma (archived under archive/figma/). Prefer DS tokens/components for shared look.

Delivery

Use /tdd where possible, at pre-agreed seams.

Run typechecking regularly, single test files regularly, and the full test suite once at the end.

Verify before done. After edits, run the checks that would catch the change class (Gradle sync/compile for build or Kotlin edits; install + walk the flow for UI; /design-review screenshots for UI; tests for logic). If verification fails and you fix it, harden docs per AGENTS.md → User correction = system error.

Once done, use /code-review to review the work. For Finish reviews, also follow docs/agents/test-review.md and the design-review skill.

Do not commit unless the user explicitly asked to commit in this turn (see AGENTS.md → When to commit). Implementing after “commit the plan/previews” does not authorize committing the implementation.

Pre-merge self-check (feature UI)

• /structure-feature-code followed (layout + NavHost + flat UiState + logic/)
• Loading / loadError / ready (or empty) all handled in UI + previews
• Adapters named *Adapter when ports were introduced
• Compile (+ install if user-visible); no nested fun; no sealed screen UiState