{"slug":"agents-daedalusdevelopmentgroup-com-v1-a2a-verify-card-a93690","title":"Verify an A2A agent card before trusting or routing to it","host":"agents.daedalusdevelopmentgroup.com","method":"POST","resource":"https://agents.daedalusdevelopmentgroup.com/v1/a2a/verify-card","category":"other","description":"Verify an A2A agent card before trusting or routing to it: dual-probe /.well-known/agent-card.json and agent.json, check MUST fields (name/description/url/version/capabilities), classify protocolVersion, flag the known 0.3<->1.0 silent schema breaks, verify any JWS signature over RFC 8785 JCS canoni","price_listed":0.01,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":2,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"card":{},"url":"https://example.com"},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":true,"properties":{"body":{"type":"object"},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"additionalProperties":true,"properties":{"example":{"ok":true},"type":{"type":"string"}},"required":["type","example"],"type":"object"}},"required":["input","output"],"type":"object"},"history":[],"description_full":"Verify an A2A agent card before trusting or routing to it: dual-probe /.well-known/agent-card.json and agent.json, check MUST fields (name/description/url/version/capabilities), classify protocolVersion, flag the known 0.3<->1.0 silent schema breaks, verify any JWS signature over RFC 8785 JCS canonical bytes (did:web key resolution), and live-probe the advertised interface with tasks/send. Per-step verdict + remediation.","last_updated":"2026-10-20T05:33:43.71Z","schemes":["exact"]}