---
phase: 06-coordination
plan: 02
subsystem: coordination
tags: [adapter, merge-queue, dependency-ordering, conflict-handling]

# Dependency graph
requires:
  - phase: 06-coordination
    plan: 01
    provides: CoordinationManager port interface, merge events
  - phase: 05-dispatch
    provides: DispatchManager pattern, task events
  - phase: 03-git
    provides: WorktreeManager, MergeResult type
provides:
  - DefaultCoordinationManager adapter implementation
  - Dependency-ordered merge processing
  - Conflict bounce-back task creation with agent messaging
affects: [06-03, future-coordination-cli]

# Tech tracking
tech-stack:
  added: []
  patterns: [in-memory queue, dependency graph resolution, conflict bounce-back]

key-files:
  created: [src/coordination/manager.ts, src/coordination/manager.test.ts]
  modified: [src/coordination/index.ts]

key-decisions:
  - "MessageRepository is optional - conflict messages only sent if configured"
  - "In-memory queue same pattern as DispatchManager (no persistence for v1)"

patterns-established:
  - "Conflict resolution creates high-priority task + info message to agent"
  - "Merge queue state exposes queued/inProgress/merged/conflicted categories"

# Metrics
duration: 4min
completed: 2026-01-30
---

# Phase 6 Plan 2: DefaultCoordinationManager Adapter Summary

**Implements CoordinationManager with dependency-ordered merging and conflict bounce-back.**

## Performance

- **Duration:** 4 min
- **Started:** 2026-01-30T21:05:00Z
- **Completed:** 2026-01-30T21:09:00Z
- **Tasks:** 3
- **Files modified:** 3
- **Tests added:** 18

## Accomplishments
- Implemented DefaultCoordinationManager adapter with in-memory merge queue
- Dependency-ordered merging via getNextMergeable() and processMerges()
- Priority ordering (high > medium > low) with FIFO within same priority
- Conflict detection and bounce-back task creation
- Agent messaging on conflict via optional MessageRepository
- Comprehensive test coverage (18 tests)

## Task Commits

Each task was committed atomically:

1. **Task 1: Implement DefaultCoordinationManager** - `6d7894b` (feat)
2. **Task 2: Enhance conflict bounce-back** - `4535707` (feat)
3. **Task 3: Add comprehensive tests** - `37a90db` (test)

## Files Created/Modified
- `src/coordination/manager.ts` - DefaultCoordinationManager adapter implementation
- `src/coordination/manager.test.ts` - 18 tests covering queue, dependencies, conflicts
- `src/coordination/index.ts` - Exports DefaultCoordinationManager

## Decisions Made
- MessageRepository is optional in constructor - conflict messages only created if available
- In-memory queue (same pattern as DispatchManager) - no persistence needed for v1
- System-generated messages use senderType='user' with null senderId

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- DefaultCoordinationManager ready for integration
- All four merge lifecycle events emitted at correct points
- Ready for 06-03-PLAN.md (CLI commands and tRPC procedures for coordination)

---
*Phase: 06-coordination*
*Completed: 2026-01-30*
