The race condition occurred when overlapping stream() calls (e.g., during
message interrupt) corrupted shared instance-level flags:
- streamedAssistantTextThisTurn
- streamedReasoningThisTurn
This caused Turn 2 to reset flags while Turn 1 was still reading them,
leading to garbled text or suppressed responses.
Fix:
- Created TurnContext interface to track per-turn streaming state
- Moved flags from instance variables to turn-local context
- Pass TurnContext through translateMessageToEvents, mapBlocksToTimeline,
and mapPartialEvent call chains
Also fixed:
- session.ts interruptAgentIfRunning() now polls for agent to become
fully idle (not just cancelled) before starting new run, matching
the fix from MCP handler
Test:
- Added E2E test that sends overlapping messages and verifies Turn 2
responds with its own content, not Turn 1's
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
