{ "name": "MCP Verification Gate", "description": "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.", "supportedInterfaces": [ { "url": "https://gate.horizonshield.dev/a2a", "protocolBinding": "JSONRPC", "protocolVersion": "1.0" }, { "url": "https://gate.horizonshield.dev/a2a", "protocolBinding": "JSONRPC", "protocolVersion": "0.3" } ], "url": "https://gate.horizonshield.dev/a2a", "provider": { "organization": "The HORIZ音s Co., Ltd.", "url": "https://shield.the-horizons-innovation.com", "legalEntity": { "registry": "JP", "scheme": "houjin-bango", "id": "7021001075279", "name": "The HORIZ音s Co., Ltd." } }, "version": "0.4.20", "protocolVersion": "1.0", "capabilities": { "streaming": false, "pushNotifications": false, "extensions": [ { "uri": "https://gate.horizonshield.dev/ext/conduct/v1", "description": "Who pays this agent, where its measured conduct record lives, and where to file a witness walk. The specification is served at the URI.", "required": false, "params": { "compensation": { "paid_by": "buyer", "referral_fee": false, "listing_fee": false, "success_fee_pct": 0, "disclosure_url": "https://shield.the-horizons-innovation.com/yakumo/plans/" }, "measured_endpoints": [ "https://gate.horizonshield.dev/mcp" ], "conduct_record": "https://gate.horizonshield.dev/history?endpoint=https%3A%2F%2Fgate.horizonshield.dev%2Fmcp", "verdict_recipe": "https://gate.horizonshield.dev/spec", "witness_intake": "https://ledger.horizonshield.dev/witness", "register": "https://gate.horizonshield.dev/register", "identity": { "kind": "did", "ref": "did:web:gate.horizonshield.dev" }, "witness_policy": { "reciprocal": true }, "witness_reply": { "transport": "a2a", "answers": "https://gate.horizonshield.dev/a2a", "request_schema": "nenrin-witness-request-v1", "reply_schema": "nenrin-witness-observation-v1", "key_url": "https://gate.horizonshield.dev/keys/witness.json", "surfaces": [ "health.gate_commit", "agent-card.signature", "well-known.jwks", "well-known.openai-apps-challenge", "ext.conduct-v1.spec", "keys.agreement", "keys.witness", "keys.operator", "well-known.did" ], "note": "When drawn, this gate measures the listed public surfaces of the requested endpoint from its own vantage and returns one Ed25519-signed nenrin-witness-observation-v1 (the key served at key_url, conduct-v1.1 section 11.4). It refuses to witness itself (self_witness) and refuses non-public targets. reciprocal here means it answers a draw; it does not initiate an unprompted caller_card walk-back." }, "rings": { "spec": "https://github.com/ogasurfproject-jpg/horizon-shield/blob/main/workers/hs-ledger/nenrin/NENRIN_SPEC_v1.md", "spec_sha256": "9ccba2e325fd2a555fcdb2dec519b8c6bf7a669064674846aea98ecfff824e3d", "base": "https://raw.githubusercontent.com/ogasurfproject-jpg/mcp-conduct-register/main/rings/", "path": "/.json", "slug": "endpoint URL without https://, lower case, every run of characters outside [a-z0-9] replaced by one hyphen, hyphens trimmed at both ends", "ledger": "https://ledger.horizonshield.dev/ledger" } } }, { "uri": "https://gate.horizonshield.dev/ext/legal-entity/v1", "description": "The legal entity that answers for this agent, declared inside the signed bytes. The specification is served at the URI.", "required": false, "params": { "registry": "JP", "scheme": "houjin-bango", "id": "7021001075279", "name": "The HORIZ音s Co., Ltd.", "lookup_url": "https://www.houjin-bangou.nta.go.jp/henkorireki-johoto.html?selHouzinNo=7021001075279" } } ] }, "defaultInputModes": [ "text/plain" ], "defaultOutputModes": [ "application/json", "text/plain" ], "securitySchemes": { "operator": { "apiKeySecurityScheme": { "location": "header", "name": "x-sweep-token", "description": "Operator-only routes (POST /sweep, POST /register/quarantine, POST /mould, DELETE /watch, the paid tier of POST /watch). No skill on this card requires it: the A2A interface at /a2a and the MCP interface at /mcp are public and unauthenticated." } } }, "securityRequirements": [ {} ], "compensation": { "paid_by": "buyer", "referral_fee": false, "listing_fee": false, "success_fee_pct": 0, "disclosure_url": "https://shield.the-horizons-innovation.com/yakumo/plans/" }, "preferredTransport": "JSONRPC", "skills": [ { "id": "check", "name": "Conformance check", "description": "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.", "tags": [ "mcp", "verification", "conformance", "disclosure" ], "examples": [ "Check https://example.com/mcp for conformance", "Does this server exist, publish an agent card, and return identical output for identical input?" ], "inputModes": [ "text/plain", "application/json" ], "outputModes": [ "application/json" ] }, { "id": "verify", "name": "Verdict verification", "description": "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.", "tags": [ "verification", "tamper-evident", "recomputable" ], "examples": [ "Verify this verdict hashes to its own record_sha256", "Recompute the digest of a verdict returned by check" ], "inputModes": [ "application/json" ], "outputModes": [ "application/json" ] }, { "id": "conditions", "name": "Verification conditions", "description": "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.", "tags": [ "methodology", "transparency", "spec" ], "examples": [ "What does this gate actually check?", "How is a verdict recomputed independently?" ], "inputModes": [ "text/plain" ], "outputModes": [ "application/json" ] }, { "id": "is-verified", "name": "Verification status", "description": "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.", "tags": [ "verification", "status", "honest-null" ], "examples": [ "Is https://example.com/mcp currently verified?", "What is this endpoint's latest state on the register?" ], "inputModes": [ "text/plain" ], "outputModes": [ "application/json" ] }, { "id": "lookup", "name": "Register lookup", "description": "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.", "tags": [ "register", "lookup", "recomputable" ], "examples": [ "Look up the record for https://example.com/mcp", "Find the latest verdict hash for this endpoint" ], "inputModes": [ "text/plain" ], "outputModes": [ "application/json" ] } ], "signatures": [ { "protected": "eyJhbGciOiJFUzI1NiIsInR5cCI6IkpPU0UiLCJraWQiOiJocy0yMDI2LTA5Iiwiamt1IjoiaHR0cHM6Ly9nYXRlLmhvcml6b25zaGllbGQuZGV2Ly53ZWxsLWtub3duL2p3a3MuanNvbiJ9", "signature": "CgmLoZvgbKudOsXmzFNpUZgZ-BMwsOdB6jE_8SzGU3NG-G0ylT8mF85xgVIYIuQLH9ONjKYumfe8kfkz_j3oHA" }, { "protected": "eyJhbGciOiJFUzI1NiIsInR5cCI6IkpPU0UiLCJraWQiOiJocy0yMDI2LTA5Iiwiamt1IjoiaHR0cHM6Ly9nYXRlLmhvcml6b25zaGllbGQuZGV2Ly53ZWxsLWtub3duL2p3a3MuanNvbiJ9", "signature": "PUMhZ7gYpLhuQARiVqbNrCwzOn7CEQxkmLvzkz5so87sZIscApMdFu8rHfETZHOFhWpsTECq8Aq2SJuy_duY2w" } ] }