- Make defensive copy of a2a_task_ids_by_endpoint dict to avoid in-place mutation
- Don't persist completed task IDs since A2A protocol rejects terminal state task IDs
- Update task_id_config locally for current loop only, not in shared dict
- Update tests to verify correct behavior:
- Completed task IDs are NOT persisted for reuse
- Each new delegation gets a fresh task_id (None)
- Completed task IDs are still tracked in reference_task_ids
Co-Authored-By: João <joao@crewai.com>
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