agent_runtime_request_conflict· reason_code· applies to service_callA different stable runtime key binding was submitted while the same open pairing_request_id already has a pending runtime request. The service MUST return HTTP 409 and MUST NOT replace the current pending request, approval_request_id, or notification id. A retry with the same ak.agent.runtime_key_binding.v1 digest is idempotent and does not use this error. See zh/identity/key-management.md §3.6.2.