## AUDIT DECISION: PASS **Ticket:** #166 - Bug: Worker marked busy but no session created **PR:** #90 **Reviewer:** tinker-reviewer **Priority:** HIGH ### Decision: PASS AUDIT ✅ This PR fixes a critical bug where agents could be marked "busy" via the `mark_busy` MCP tool without having an active AgentSession, causing terminal logs to have nowhere to attach. ### What Was Fixed **Root Cause:** The `mark_busy` tool only updated `availability_status` but didn't verify a running session existed. **Solution:** - ✅ `mark_busy` now requires an active running session - ✅ Returns helpful error if no session exists - ✅ Added zombie detection scope (`busy_without_session`) - ✅ Added auto-cleanup method (`mark_idle_if_no_session!`) ### Implementation Quality **Fail-Fast Approach:** Prevents zombie state at the source by checking for running session before allowing busy status. **Helpful Error Messages:** Clear guidance on how sessions are created externally. **Zombie Detection:** Can find and cleanup agents stuck in "busy but no session" state. **Well-Tested:** 12 new test examples covering all code paths. ### Test Results - Agent specs: 38/38 passed ✅ - Full suite: 688 passed, 2 pre-existing failures (unrelated) ### Ready to Merge This is a high-priority bug fix with solid implementation. No issues found. Ready to merge immediately. See code review comment #162 for detailed findings.