Agent Card Validator MCP

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.

Skills

• Audit ($0.05)
  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.
  x402a2aagent-cardauditscoringdiscoveryopenapiwell-knownvalidatorci
• Lint ($0.03)
  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.
  x402a2aagent-cardlintschema-validationjson-schemaciwell-knownvalidatorgoogle-a2a

How to call

https://agent-card-validator-mcp.mtree.workers.dev