MCP Verification Gate

Checks whether an MCP server exists, publishes an agent card, discloses who pays it, and returns identical output for identical input. Free. Conformance and disclosure only; this gate does not verify that any price returned by a checked server is correct.

Skills

• Conformance check
  POST /check with an MCP endpoint URL, or call the check_conformance tool over MCP at /mcp. Returns a verdict with a recomputable SHA-256. Over A2A (SendMessage at /a2a), a text part carrying an MCP endpoint URL returns this gate's current register reading for it (the same bytes as GET /is-verified): verified true only on a full pass, null otherwise, never false.
  mcpverificationconformancedisclosure
• Verdict verification
  Recompute the SHA-256 of a verdict this gate issued, so you do not have to trust the issuer. Available as the verify_verdict tool over MCP.
  verificationtamper-evidentrecomputable
• Verification conditions
  Return the exact conditions this gate measures (MCP reachability, agent card, compensation disclosure, deterministic output) and how each verdict is recomputed. The get_conditions tool over MCP and GET /spec serve the same methodology.
  methodologytransparencyspec
• Verification status
  Report whether an endpoint's latest measurement passed all measured conditions. Returns true or null (state: verified, pending, held, watched, absent), never false. Available as the is_verified tool over MCP.
  verificationstatushonest-null
• Register lookup
  Look up an endpoint's record on the public register: its latest verdict, state, and record SHA-256, with a recompute URL. Available as the lookup_server tool over MCP.
  registerlookuprecomputable

How to call

https://gate.horizonshield.dev/a2a

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