---
phase: 01-core-infrastructure
plan: 03
subsystem: infra
tags: [process-management, execa, child-process, lifecycle]

# Dependency graph
requires:
  - phase: 01-01
    provides: TypeScript project with ESM configuration
provides:
  - ProcessRegistry class for tracking process metadata
  - ProcessManager class for spawning/stopping child processes
  - Process lifecycle management infrastructure
affects: [04-agent-lifecycle]

# Tech tracking
tech-stack:
  added: [execa]
  patterns: [registry-pattern, detached-processes]

key-files:
  created:
    - src/process/types.ts
    - src/process/registry.ts
    - src/process/manager.ts
    - src/process/index.ts
  modified: []

key-decisions:
  - "In-memory registry for now (SQLite persistence in Phase 2)"
  - "Detached processes with stdio: ignore for background operation"
  - "5-second graceful shutdown with SIGTERM before SIGKILL"

patterns-established:
  - "Registry pattern: Map-based storage with typed CRUD operations"
  - "Process lifecycle: spawn → track → stop with exit event handling"

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

# Phase 1 Plan 3: Process Management Summary

**ProcessRegistry and ProcessManager classes for spawning, tracking, and stopping detached child processes using execa**

## Performance

- **Duration:** 4 min
- **Started:** 2026-01-30T12:12:31Z
- **Completed:** 2026-01-30T12:16:06Z
- **Tasks:** 2/2
- **Files modified:** 4

## Accomplishments

- ProcessRegistry class with Map-based storage for process metadata tracking
- ProcessManager class using execa for spawning detached background processes
- Full process lifecycle support: spawn, stop, stopAll, restart, isRunning
- Proper exit event handling to update registry status automatically

## Task Commits

Each task was committed atomically:

1. **Task 1: Create process types and registry** - `40a6617` (feat)
2. **Task 2: Create process manager with spawn/stop** - `2f3df1d` (feat)

## Files Created/Modified

- `src/process/types.ts` - ProcessInfo, SpawnOptions, ProcessStatus type definitions
- `src/process/registry.ts` - In-memory process registry with CRUD operations
- `src/process/manager.ts` - Process lifecycle manager using execa
- `src/process/index.ts` - Module barrel exports

## Decisions Made

| Decision | Rationale |
|----------|-----------|
| In-memory Map storage | Simple for now, Phase 2 adds SQLite persistence |
| Detached mode with stdio: ignore | Background processes shouldn't block parent or inherit stdio |
| 5-second graceful timeout | Industry standard for graceful shutdown before force kill |
| execa over child_process | Better promise-based API, cleaner signal handling |

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Process infrastructure complete, ready for Phase 4 (Agent Lifecycle)
- ProcessManager can spawn, track, and stop child processes
- Registry provides metadata tracking foundation for agent management

---
*Phase: 01-core-infrastructure*
*Completed: 2026-01-30*
