{"name":"Agent Card Validator MCP","description":"Pay-per-call MCP that audits + lints any x402/A2A service's discovery surfaces (agent-card.json, ai-plugin.json, openapi.yaml, mcp.json, agent-discovery). Returns a 0-100 quality score plus an improvement TODO list and a strict JSON-schema lint report. Helps agents and developers grade x402 services on completeness/quality before integration. USDC on Base via x402 — no signup, no API key.","url":"https://agent-card-validator-mcp.mtree.workers.dev","version":"0.1.0","documentationUrl":"https://agent-card-validator-mcp.mtree.workers.dev/agent-discovery","capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"authentication":{"schemes":["x402"],"credentials":"Pay-per-call via x402 USDC on Base — no signup, no API key. Each call returns 402 with an EXACT-scheme requirement; agents pay 0x1664530DC2A1CA350B1dbaD1Fc1F1a70c90fe4de in Base USDC and retry with X-PAYMENT."},"defaultInputModes":["application/json"],"defaultOutputModes":["application/json"],"skills":[{"id":"wellknowns-audit","name":"Audit ($0.05)","description":"Audit any x402/A2A service's discovery surfaces (agent-card, ai-plugin, openapi, agent-discovery, mcp). Fetches all 5 surfaces in parallel, scores them 0-100 across presence + completeness + recommended fields, returns sub-scores + structured improvement TODO list. Use for portfolio quality monitoring, CI gating, or pre-integration vetting. Pay-per-call USDC on Base via x402 — no signup, no API key.","tags":["x402","a2a","agent-card","audit","scoring","discovery","openapi","well-known","validator","ci"],"examples":["Audit https://procure-mcp.mtree.workers.dev — what's its score?","Score the discovery surfaces of evm-tx-toolkit and tell me the top fixes.","Run an audit on my-new-service.workers.dev before I list it on awesome-x402.","Compare the audit scores of two competing x402 services."],"inputModes":["application/json"],"outputModes":["application/json"]},{"id":"wellknowns-lint","name":"Lint ($0.03)","description":"Strict JSON-schema validation of agent-card.json against the Google A2A AgentCard spec subset. Returns valid:bool + structured errors at fatal/error/warn severities with JSONPath-style locations. Use for CI gating before service deploy or for blocking integration if the agent-card is malformed. Pay-per-call USDC on Base via x402 — no signup, no API key.","tags":["x402","a2a","agent-card","lint","schema-validation","json-schema","ci","well-known","validator","google-a2a"],"examples":["Lint the agent-card.json at https://procure-mcp.mtree.workers.dev — is it valid?","Check whether https://my-svc.workers.dev/.well-known/agent-card.json passes the A2A spec.","Run a strict lint and show me only fatal/error issues for CI gating.","Validate the agent-card before I publish — what fields am I missing?"],"inputModes":["application/json"],"outputModes":["application/json"]}]}