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Giles Odigwe
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* feat(a2a): link follow-up messages via reference_task_ids Track the task_id from A2A responses (task, status_update, artifact_update, and message payloads) on session.state and include it as reference_task_ids on subsequent outgoing messages. This enables remote agents to correlate follow-up messages as task refinements per the A2A spec. Resolves #5938 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * feat(a2a): add A2AAgentSession for typed protocol state tracking Introduce A2AAgentSession (subclass of AgentSession) with context_id, task_id, and task_state properties. This follows the DurableAgentSession pattern and mirrors the .NET A2AAgentSession design. - Track task_id, context_id, and task_state from all response payload types - Validate context_id consistency (raise on mismatch) - Auto-assign server-generated context_id when not set - Only A2AAgentSession gets reference tracking (no state dict fallback) - Plain AgentSession continues to work without reference tracking - Add serialization support (to_dict/from_dict) - Export via agent_framework.a2a and agent_framework_a2a Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * style: remove unnecessary string annotation (pyupgrade) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: use AgentSession.from_dict for state deserialization Avoids importing private _deserialize_state, matching the DurableAgentSession pattern. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: track context_id from message payloads in A2AAgentSession Previously, context_id was only captured from task, status_update, and artifact_update payloads. Message-only responses (which carry context_id but may lack task_id) were silently lost. This fix: - Captures msg.context_id in the message handler - Persists session state when either last_task_id or last_context_id is present (not only when task_id is truthy) - Only updates task_id/task_state when a task_id was actually returned - Adds a test for message-only context_id tracking Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * addressed comments * Gate status content to INPUT_REQUIRED/terminal states (match .NET) Match .NET's GetUserInputRequests pattern: only emit TaskStatusUpdateEvent message content when state is INPUT_REQUIRED or terminal. Intermediate status text (WORKING, SUBMITTED) is no longer surfaced to callers. When state is INPUT_REQUIRED, set additional_properties['input_required'] = True so callers can distinguish input requests from final responses. Closes #5937 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Address review: remove message task_id tracking, defensive fallbacks, and input_required flag - Do not track task_id from Message payloads (simple interactions without task tracking) - Remove 'or last_task_id' fallback from status_update and artifact_update handlers (spec guarantees task_id is always set) - Remove additional_properties['input_required'] flag (content gating to INPUT_REQUIRED/terminal states is the signal itself) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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