---
phase: 02-lifecycle-command-safety
plan: 02
subsystem: ui
tags: [react, typescript, runtime, lifecycle, tauri]
requires:
  - phase: 02-lifecycle-command-safety
    provides: backend lifecycle snapshot metadata and conflict guards from plan 02-01
provides:
  - frontend lifecycle command and result types
  - manager-owned lifecycle progress and apply-impact state
  - RuntimeSurface regression coverage for lifecycle manager semantics
affects: [phase-02-03, runtime-status-card, runtime-settings-drawer]
tech-stack:
  added: []
  patterns: [manager-owned lifecycle state, apply-impact classification from saved-versus-draft config]
key-files:
  created: []
  modified:
    - tauri-app/src/features/runtime/types.ts
    - tauri-app/src/features/runtime/api.ts
    - tauri-app/src/features/runtime/runtime-utils.ts
    - tauri-app/src/features/runtime/useRuntimeManager.ts
    - tauri-app/src/features/runtime/components/RuntimeSurface.test.tsx
key-decisions:
  - "Mirror backend lifecycle metadata directly into the frontend RuntimeSnapshot so polling and command responses share one contract."
  - "Derive applyImpact from saved baseline versus draft config using the backend restart-required field list instead of UI-only heuristics."
  - "Expose activeLifecycleCommand, lastLifecycleResult, and lifecycleBusy from the manager so status-card and drawer copy can consume explicit state in plan 02-03."
patterns-established:
  - "Runtime manager normalizes lifecycle metadata on every snapshot before reconciling draft-safe state."
  - "Blocked duplicate lifecycle requests become manager-visible lifecycle results before UI surfaces render them."
requirements-completed: [CTRL-01, CTRL-02, CTRL-03]
duration: 14min
completed: 2026-03-29
---

# Phase 2 Plan 02: Lifecycle Command Safety Summary

**Frontend runtime state now tracks explicit lifecycle commands, completion messages, and restart/apply impact on top of the Phase 1 draft model**

## Performance

- **Duration:** 14 min
- **Started:** 2026-03-29T03:56:04Z
- **Completed:** 2026-03-29T04:10:22Z
- **Tasks:** 2
- **Files modified:** 5

## Accomplishments
- Added frontend lifecycle command, result, and apply-impact types plus fallback snapshot support in the runtime API layer.
- Refactored the runtime manager to expose `activeLifecycleCommand`, `lastLifecycleResult`, `lifecycleBusy`, and `applyImpact` while keeping dirty-draft polling safety intact.
- Expanded `RuntimeSurface` tests to cover lifecycle metadata mirroring, apply-impact classification, start/stop progress, and restart-required manager state.

## Task Commits

Each task was committed atomically:

1. **Task 1: Mirror backend lifecycle metadata and define frontend apply-impact contracts** - `a72c902` (test)
2. **Task 1: Mirror backend lifecycle metadata and define frontend apply-impact contracts** - `2cb6cad` (feat)
3. **Task 2: Replace generic busy handling with action-specific manager state** - `1d45342` (test)
4. **Task 2: Replace generic busy handling with action-specific manager state** - `1bcd4be` (feat)

## Files Created/Modified
- `tauri-app/src/features/runtime/types.ts` - mirrors backend lifecycle fields and apply-impact unions in the frontend contract.
- `tauri-app/src/features/runtime/api.ts` - preserves lifecycle result metadata in local fallback snapshots.
- `tauri-app/src/features/runtime/runtime-utils.ts` - classifies apply impact from the backend restart-required field list and provides lifecycle result defaults.
- `tauri-app/src/features/runtime/useRuntimeManager.ts` - owns explicit lifecycle progress and completion state alongside the existing draft/live split.
- `tauri-app/src/features/runtime/components/RuntimeSurface.test.tsx` - covers manager lifecycle semantics through the React runtime feature harness.

## Decisions Made
- Normalized snapshots inside the manager so older fallback payloads and fresh backend payloads both produce defined lifecycle fields.
- Kept `busy` available for brownfield consumers while adding explicit lifecycle state that plan 02-03 can render directly.
- Used the backend restart-required field list (`connection_mode`, `model_path`, `addr`, `gpu_layers`, `ctx_size`) as the only source of truth for `restart_required` apply impact.

## Deviations from Plan

None - plan executed as written.

## Issues Encountered
- None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- `RuntimeStatusCard` and `RuntimeSettingsDrawer` can now render explicit lifecycle progress and apply guidance from manager props instead of inferring from `busy`.
- Phase 2 UI work can show restart-required and save-before-apply messaging without re-implementing backend guard logic.

---
*Phase: 02-lifecycle-command-safety*
*Completed: 2026-03-29*