---
phase: 01.1-hexagonal-architecture
plan: 06
subsystem: api
tags: [trpc, http-adapter, cli-client, integration-tests, type-safety]

# Dependency graph
requires:
  - phase: 01.1-02
    provides: tRPC router with health/status procedures
  - phase: 01.1-05
    provides: Server lifecycle event emission via EventBus
provides:
  - tRPC HTTP adapter for CoordinationServer
  - Type-safe CLI client for server communication
  - Integration tests proving full CLI-server tRPC flow
affects: [02-agent-detection, future-webui]

# Tech tracking
tech-stack:
  added: []
  patterns: [fetch-adapter-for-node-http, typed-client-factory]

key-files:
  created:
    - src/server/trpc-adapter.ts
    - src/cli/trpc-client.ts
    - tests/integration/cli-server.test.ts
  modified:
    - src/server/index.ts
    - src/cli/index.ts
    - package.json

key-decisions:
  - "Use @trpc/server/adapters/fetch for HTTP handling"
  - "Keep /health and /status HTTP endpoints for curl/debugging"
  - "CLI status command uses tRPC for type-safe communication"

patterns-established:
  - "tRPC adapter pattern for node:http servers"
  - "Client factory with environment variable defaults"
  - "Integration tests using real server with random ports"

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

# Phase 1.1 Plan 06: CLI-tRPC Integration Summary

**Type-safe CLI-server communication via tRPC with HTTP adapter and comprehensive integration tests**

## Performance

- **Duration:** 4 min
- **Started:** 2026-01-30T13:04:00Z
- **Completed:** 2026-01-30T13:08:50Z
- **Tasks:** 2
- **Files modified:** 6

## Accomplishments

- tRPC HTTP adapter integrated into CoordinationServer via fetch adapter
- Type-safe CLI client with factory functions for creating clients
- CLI status command displays server health via tRPC
- 7 integration tests proving full CLI-server tRPC flow
- HTTP endpoints (/health, /status) preserved for backwards compatibility

## Task Commits

Each task was committed atomically:

1. **Task 1: Add tRPC HTTP adapter to server and create CLI client** - `9da12a8` (feat)
2. **Task 2: Update CLI status command and write integration tests** - `d893fc5` (feat)

**Plan metadata:** (this commit)

## Files Created/Modified

- `src/server/trpc-adapter.ts` - Fetch adapter for routing /trpc/* requests
- `src/cli/trpc-client.ts` - Typed client with createTrpcClient() and createDefaultTrpcClient()
- `src/server/index.ts` - Added tRPC routing alongside existing HTTP endpoints
- `src/cli/index.ts` - Status command uses tRPC client for server communication
- `tests/integration/cli-server.test.ts` - 7 tests covering health, status, and error handling
- `package.json` - Moved @trpc/client from devDeps to regular deps

## Decisions Made

1. **Use @trpc/server/adapters/fetch** - Converts IncomingMessage/ServerResponse to fetch Request/Response for clean tRPC integration
2. **Keep HTTP endpoints** - /health and /status remain for curl/debugging alongside /trpc/* endpoints
3. **Graceful error handling** - CLI shows helpful message when server is unreachable

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Phase 1.1 complete: hexagonal architecture retrofitted
- Event-driven patterns established for all modules
- Type-safe tRPC contract between CLI and server
- 131 tests covering all components
- Ready for Phase 2: Agent Detection

---
*Phase: 01.1-hexagonal-architecture*
*Completed: 2026-01-30*
