Description

The current implementation of A2AAgent handles the context_id of messages sent to A2AServer in an unreasonable way.
At present, it extracts the context_id from additional_properties.
The proper approach should be to use AgentSession.service_session_id as the context_id.
This aligns with the intended purpose of service_session_id and ensures session consistency across the entire system.

Code Sample

Error Messages / Stack Traces

Package Versions

agent-framework: 1.0.1

Python Version

Python 3.13

Additional Context

No response