{"ok":true,"service":"a2a-callback-receiver","label":"A2A Callback Receiver","version":"1.0.0","public_path":"/a2a-callback-receiver/","api_path":"/api/a2a-callback-receiver","alias_api_path":"/api/agent-callback-receiver","schema":"/schemas/a2a-callback-receiver.schema.json","modes":["read_callback_receiver","register_callback_target","build_completion_callback","receive_a2a_callback","acknowledge_callback","read_recent_callbacks"],"mcp_tool":"build_a2a_callback_envelope","summary":"Receive external agent completion, receipt, and verification callback packets.","accepted_event_types":["rail.completed","receipt.recorded","receipt.verified","return_package.ready","regression.passed","regression.failed"],"runtime_env":"ready","timestamp":"2026-06-17T06:53:51.653Z"}