---
phase: 23-brainstormer-flow
plan: "01"
subsystem: api, chat-service
tags: [express, drizzle, chat, handoff, issue-creation, system-messages]
dependency_graph:
  requires:
    - phase: 23-00
      provides: messageType column in chat_messages, handoffSchema validator
    - phase: 21-chat-foundation
      provides: chatService, chatRoutes, addMessage, getConversation
  provides:
    - addSystemMessage helper in chatService
    - messageType support in addMessage
    - POST /conversations/:id/handoff route
    - POST /conversations/:id/status-update route
  affects:
    - server/src/services/chat.ts
    - server/src/routes/chat.ts
tech_stack:
  added: []
  patterns:
    - addSystemMessage encapsulates system-role message insertion with typed messageType
    - handoff route creates 3 artifacts atomically (handoff msg, issue, task_created msg)
    - companyId resolved from conversation row — not passed in request body
key_files:
  created:
    - server/src/services/chat.ts
    - server/src/routes/chat.ts
  modified: []
decisions:
  - "Import issueService from ../services/issues.js directly (not via index.js) — matches plan guidance and local instantiation pattern used in heartbeat.ts"
  - "issueSvc instantiated inside chatRoutes(db) — option (a) from plan, simplest approach"
  - "Handoff content uses arrow character (→) in system message; spec fields assembled into markdown description"
requirements-completed: [AGENT-03, AGENT-06, AGENT-07, CHAT-09]
metrics:
  duration: "8 minutes"
  completed_date: "2026-04-01"
  tasks_completed: 2
  files_changed: 2
---

# Phase 23 Plan 01: Chat Service Extension — handoff + status-update Routes Summary

**Extended chatService with addSystemMessage helper and messageType support, and added POST handoff and status-update routes that insert typed system messages and create issues from brainstormer specs.**

## Tasks Completed

| Task | Name | Commit | Files |
|------|------|--------|-------|
| 1 | Extend chat service with messageType support and addSystemMessage | 0a1b3dc0 | server/src/services/chat.ts |
| 2 | Add handoff and status-update routes | 241e418a | server/src/routes/chat.ts |

## Verification

- `pnpm exec tsc --noEmit -p server/tsconfig.json` passes for chat files (pre-existing plugin-sdk errors unrelated)
- `pnpm vitest run` — same failures as baseline (6 pre-existing, none new)
- All 5 acceptance criteria pass for both tasks

## Deviations from Plan

None — plan executed exactly as written.

## Known Stubs

None — both routes are fully implemented. The `streamEcho` stub in chatService is pre-existing from Phase 22 (to be replaced with real LLM adapter in a future phase).

## Self-Check: PASSED