What changed: Internal tool execution system migrated from function-based approach to a class-based queue system with better concurrent execution support.
Technical details:
- New
Qr1class manages tool execution queue with status tracking ("queued" → "executing" → "completed" → "yielded") - Intelligent concurrency: Tools marked as concurrency-safe can execute in parallel, while non-concurrent-safe tools block subsequent processing
- Feature-flag controlled: Uses
tengu_streaming_tool_executionflag to gradually roll out new architecture - Backward compatible: Falls back to renamed legacy functions (
Ev5()at line 429788) when feature flag is disabled
User impact:
- Better responsiveness when Claude uses multiple tools simultaneously
- More efficient parallel processing of independent operations
- Improved result streaming as tools complete
Evidence
Qr1 class definition at line 429311, feature flag check at line 429499
Strings lifted out of the shipped bundle, so the claim above can be checked against them.