Agent Contract Proof

{'type': 'object', 'required': ['url'], 'properties': {'url': {'type': 'string', 'maxLength': 2048, 'description': 'Public HTTP or HTTPS agent/API URL. An origin URL may be resolved through discovery metadata.'}, 'method': {'enum': ['GET', 'POST', 'PUT', 'PATCH', 'DELETE'], 'type': 'string', 'description': 'Optional method to probe. If omitted, the advertised method is used, then GET as a fallback.'}, 'expected_hash': {'type': 'string', 'pattern': '^[a-fA-F0-9]{64}$', 'description': 'Optional previous contract_hash. A mismatch proves the public contract changed.'}}, 'additionalProperties': False}