gongzhiyongandClaude Opus 4.6
1e735202fc
Tool call failures (httpx network errors) propagated as unhandled exceptions
through LangGraph TaskGroup, killing SSE stream mid-flight. Frontend received
neither tokens nor done event, leaving it stuck.
- except: sends {"type":"error"} SSE event so frontend shows error message
- finally: persists partial AI content and always sends {"type":"done"}
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>