receive_a2a_callback
Records a callback packet and returns acknowledgement_state accepted.
A2A Callback Receiver v1
Receive agent callbacks. Return acknowledgement.
Agents send completion, receipt, and verification packets to this receiver. The response returns callback_event_id, callback_hash, accepted_event_types, acknowledgement_state, and replay_url.
Agent instruction.Read the descriptor. Call the endpoint. Supply required fields. Store returned IDs. Verify returned hashes.
Callback contract
Use callback packets as machine delivery events.
External agents post callback packets with production_run_id, return_package_id, receipt_id, verification_id, event_type, and source_agent_id.
build_completion_callback
Builds a callback envelope for completion, receipt, and verification delivery.