Fix A2A protocol chunk streaming and task completion states#1113
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This PR fixes issues where A2A endpoints would prematurely truncate streams or drop events during conversational handoffs. * Stream Persistence: RemoteA2AAgent no longer aborts streams prematurely on HTTP endpoints. It now properly waits for the formal TaskState.COMPLETED status update. * Artifact Chunking: Fixed flag assignments in AgentExecutor so the first chunk reliably sends append=false and lastChunk cleanly mimics the generated partial state. * Protocol Alignment: Removed the Message payload in the final success event to perfectly reflect the Go A2A reference implementation.
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Summary
This PR fixes issues where A2A endpoints would prematurely truncate streams or drop events during conversational handoffs.
Key Changes
RemoteA2AAgentno longer aborts streams prematurely on HTTP endpoints. It now properly waits for the formalTaskState.COMPLETEDstatus update.AgentExecutorso the first chunk reliably sendsappend=falseandlastChunkcleanly mimics the generatedpartialstate.Messagepayload in the final success event to perfectly reflect the Go A2A reference implementation.Testing: Validated against the
a2a_serverwith thea2a_basicclient, fully restoring end-to-end multi-agent evaluation output natively. All unit tests succeed.