Python: [Bug]: [A2A] Correctly Handle task_id and message_id Returned by A2A

[lixiaoqiang]

Description

In bug#5263, I proposed assigning the task_id returned by A2A to AgentResponseUpdate.response_id, and assigning the message_id (or artifact_id) returned by A2A to AgentResponseUpdate.message_id.

This bug was fixed in fix#5288, but the latest code has reversed the previous fix.

The latest code assigns task_id to AgentResponseUpdate.response_id but ignores assigning a value to AgentResponseUpdate.message_id.

I am not sure whether this is an intentional design choice or an accidental mistake.

My personal opinion is:

• task_id corresponds to AgentResponseUpdate.response_id
• message_id corresponds to AgentResponseUpdate.message_id

I understand that message_id is the unique ID for each complete request/response message, and task_id is the ID for a single round of conversation.

Is my understanding incorrect?

If my understanding is wrong, how should we interpret the mapping relationship between A2A's task_id/message_id and MAF's response_id/message_id?

Code Sample

Error Messages / Stack Traces

Package Versions

agent-framework-a2a:1.0.0b260514

Python Version

python:3.13

Additional Context

No response

[github-actions]

🤖 Automated triage reproduction notes (agent-authored — trust but verify)

Agent analysis

Repro: A2Agent._updates_from_task_update_event() in python/packages/a2a/agent_framework_a2a/_agent.py (line ~587) omits message_id when constructing AgentResponseUpdate for TaskStatusUpdateEvent — the field message.message_id (where message = update_event.status.message) is available but not passed. Minimal repro: stream a TaskStatusUpdateEvent with a known message_id and assert AgentResponseUpdate.message_id equals it. The same omission exists in _updates_from_completed_task at line ~539 for in-progress status messages.

• Failing test: python/packages/a2a/tests/test_issue_5949_message_id.py::test_task_status_update_event_propagates_message_id
• Files examined: python/packages/a2a/agent_framework_a2a/_agent.py, python/packages/a2a/tests/test_a2a_agent.py, python/packages/core/agent_framework/_types.py, python/packages/a2a/pyproject.toml
• Tests run: python/packages/a2a/tests/test_issue_5949_message_id.py::test_task_status_update_event_propagates_message_id (FAILED), python/packages/a2a/tests/test_issue_5949_message_id.py::test_task_artifact_update_event_propagates_message_id (PASSED)
• Reported version: 1.0.0b260514
• Current version: 1.0.0b260514