## QA Verification: PASSED ✅ **Verification Date:** 2026-01-03 **Full Report:** /tmp/qa-CLIAPI-17.md ### Summary All 5 QA criteria verified and passing. Implementation is complete, well-tested, and ready for merge. ### Test Results - **New Tests:** 17 total (14 added in CLIAPI-17 + 3 pre-existing message tests) - **Pass Rate:** 17/17 (100%) ✅ - **Pre-existing Failures:** 55 unrelated failures in mock_claude/websocket tests ### QA Criteria Verification ✅ /messages sends content to running session ✅ /messages returns 409 if session not running ✅ /resume restarts completed session with new prompt ✅ /continue re-runs last context ✅ fork_session creates new session from existing ### Code Quality - Comprehensive error handling (404, 409, 500) - Proper state validation and transitions - Clean integration with CLIAPI-16 dependencies - Excellent documentation and docstrings - No security concerns identified ### Recommendation **APPROVE** and merge to CLIAPI-1 ### Files Modified - src/cli_agent_api/models/session.py (+45 lines) - src/cli_agent_api/routers/sessions.py (+185 lines) - src/cli_agent_api/services/session_manager.py (+205 lines) - tests/unit/test_sessions_router.py (+520 lines) **Total:** +955 lines

## Implementation Complete ### Changes Made: **New Endpoints:** 1. `POST /sessions/{id}/messages` - Send a message to a running session - Validates session is running (status: running or waiting_permission) - Validates session accepts stdin input (input_format='stream-json') - Returns 409 if session not running or doesn't accept input 2. `POST /sessions/{id}/resume` - Resume a completed session with new prompt - Accepts `prompt` and optional `fork_session` flag - If fork_session=true, creates new session from context - Validates session is in completed/failed/cancelled state 3. `POST /sessions/{id}/continue` - Continue session without new prompt - Re-runs last context of a completed session - Useful for retrying after failures **New Models:** - `SendMessageRequest`: Request with `content` field - `ResumeSessionRequest`: Request with `prompt` and `fork_session` fields - `ContinueSessionRequest`: Empty request (signals intent) - `SessionActionResponse`: Unified response with session_id, status, message_id, forked_session_id **Session Manager Methods:** - `resume_session(session_id, prompt, fork)`: Restart or fork completed session - `continue_session(session_id)`: Re-run last context - `SessionNotRunningError`: New exception for state validation ### Testing: - Added 14 new unit tests covering: - All success cases for each endpoint - Session not found (404) - Session not in valid state (409) - Session doesn't accept input (409) - Write failures (500) - fork_session option for resume - Failed and cancelled session continuation All 14 new tests pass. Pre-existing test failures are unrelated to these changes. ### Files Modified: - `src/cli_agent_api/models/session.py`: +45 lines (new models) - `src/cli_agent_api/routers/sessions.py`: +185 lines (new endpoints) - `src/cli_agent_api/services/session_manager.py`: +205 lines (new methods) - `tests/unit/test_sessions_router.py`: +520 lines (new tests)

## Feature Triage Complete **Status:** PARTIALLY IMPLEMENTED ### Summary The core infrastructure for multi-turn sessions is already fully implemented (CLIAPI-16): - `SessionManager.write_to_stdin()` - working - `ClaudeProcess.send_user_message()` - working - `input_format='stream-json'` support - working - `MessageSendResult` model - exists ### What's Missing (Router Endpoints Only) 1. `POST /sessions/{id}/messages` - Send message to running session 2. `POST /sessions/{id}/resume` - Resume completed session with new prompt 3. `POST /sessions/{id}/continue` - Continue session without new prompt ### Complexity: Medium ~200-300 lines of new code to wire up existing functionality. ### Implementation Order 1. `/messages` endpoint (most impactful, enables multi-turn) 2. `/resume` endpoint (session resumption) 3. `/continue` endpoint (specialized use case) See full triage report at /tmp/triage-CLIAPI-17.md