ONCE — Exactly-Once Reliability for AI Agent Actions

{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'Any stable demo id. Reuse the SAME id on the second call to prove duplicate suppression.'}}, 'additionalProperties': False}

{'type': 'object', 'required': ['idempotencyKey', 'action', 'verify'], 'properties': {'action': {'type': 'object', 'required': ['method', 'url'], 'properties': {'url': {'type': 'string'}, 'body': {}, 'method': {'type': 'string'}, 'headers': {'type': 'object'}}, 'additionalProperties': True}, 'verify': {'type': 'object', 'required': ['url', 'path'], 'properties': {'url': {'type': 'string'}, 'path': {'type': 'string'}, 'equals': {}}, 'additionalProperties': True}, 'idempotencyKey': {'type': 'string', 'description': 'Stable key representing this one intended real-world action. Reuse it for retries.'}}, 'additionalProperties': False}