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Evan Mattson 3ae86f098e Python: Propagate thread_id and forwarded_props through AG-UI to A2A context_id (#5383 )

* Propagate session.service_session_id as A2A context_id

When A2AAgent is used behind the AG-UI protocol, the client thread_id is
stored in session.service_session_id but was never forwarded as the A2A
context_id. This broke session continuity across the AG-UI → A2A boundary.

Add an optional context_id keyword argument to _prepare_message_for_a2a()
and pass session.service_session_id from run(). The explicit
message.additional_properties["context_id"] still takes precedence.

Fixes #5345

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add integration tests for session context_id wiring in run() (#5345)

- Enhance MockA2AClient.send_message to capture last_message for assertions
- Add test_run_passes_session_service_session_id_as_context_id: verifies
  run() passes session.service_session_id through to A2A message context_id
- Add test_run_message_context_id_takes_precedence_over_session: verifies
  explicit message context_id wins over session fallback
- Update _prepare_message_for_a2a docstring to document context_id param
  and its precedence rules

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address review feedback for #5345: Python: [Bug]: Inconvenient passing of context_id / thread_id in A2A/AG-UI implementations

---------

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

3ae86f098e · 2026-04-22 17:44:41 +00:00

History

agent_framework_a2a

Python: Propagate thread_id and forwarded_props through AG-UI to A2A context_id (#5383 )

2026-04-22 17:44:41 +00:00

tests

Python: Propagate thread_id and forwarded_props through AG-UI to A2A context_id (#5383 )

2026-04-22 17:44:41 +00:00

AGENTS.md

.NET: Python: Add AGENTS.md files and update coding standards (#3644 )

2026-02-05 10:27:46 +00:00

LICENSE

Python: basic python a2a support (#906 )

2025-09-29 17:53:45 +00:00

pyproject.toml

Python: Bump versions for a release. Update CHANGELOG (#5385 )

2026-04-21 15:14:42 +09:00

README.md

Python: restructure: Python samples into progressive 01-05 layout (#3862 )

2026-02-12 17:36:36 +00:00

README.md

Get Started with Microsoft Agent Framework A2A

Please install this package via pip:

pip install agent-framework-a2a --pre

A2A Agent Integration

The A2A agent integration enables communication with remote A2A-compliant agents using the standardized A2A protocol. This allows your Agent Framework applications to connect to agents running on different platforms, languages, or services.

Basic Usage Example

See the A2A agent examples which demonstrate:

Connecting to remote A2A agents
Sending messages and receiving responses
Handling different content types (text, files, data)
Streaming responses and real-time interaction