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Eduard van Valkenburg 4b21f38650 Python: Fix A2AAgent to invoke context providers before and after run (#4757 )

* Fix A2AAgent to invoke context providers before and after run

A2AAgent.run() bypassed the context provider lifecycle (before_run/after_run)
that BaseAgent defines as a contract for all agents. This caused A2AAgent to
violate the semantic definition of BaseAgent, resulting in inconsistency with
other agent implementations.

The fix follows the same pattern used by WorkflowAgent:
- Create SessionContext and run before_run on all context providers before
  processing the A2A stream
- Collect response updates and run after_run on all context providers after
  the stream is fully consumed
- Auto-create a session when context providers are configured but no session
  is explicitly passed

Fixes #4754

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

* Apply pre-commit auto-fixes

* Remove reproduction report from repository

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

* Address PR review feedback for #4754

- Validate messages when no continuation_token: raise ValueError if
  normalized_messages is empty, preventing IndexError on messages[-1]
- Import BaseContextProvider/SessionContext from public agent_framework
  package instead of internal agent_framework._sessions module
- Add test for ValueError on run(None) without continuation_token

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

* Improve test coverage for empty-messages guard in A2AAgent.run (#4754)

- Parameterize test to cover both messages=None and messages=[] inputs
- Add test verifying run(None, continuation_token=...) does not raise

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

---------

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

4b21f38650 · 2026-03-19 10:45:42 +00:00

History

agent_framework_a2a

Python: Fix A2AAgent to invoke context providers before and after run (#4757 )

2026-03-19 10:45:42 +00:00

tests

Python: Fix A2AAgent to invoke context providers before and after run (#4757 )

2026-03-19 10:45:42 +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: Simplify Python Poe tasks and unify package selectors (#4722 )

2026-03-18 18:39:11 +00:00

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