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MCP Tool Surface Digest & Attestation
x402
MCP Tool Surface Digest & Attestation is a paid API for AI agents from witness.holoweave.org, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Computes a stable, signed digest over an MCP server's tools/list (tool names, descriptions, and inputSchemas) and returns a cryptographically signed attestation as a baseline for future integrity comparisons.
Price / call$0.01
Success—
StatusDown
How this service works
Web bot auth debugging for AI agents, priced per check at $0.01. RFC 7638 keyid thumbprint verification, RFC 9421 Ed25519 signature verification, and per-verifier acceptance rules. Signed attestations, published fixtures, sources with dates.
Output
Returns a JSON object containing an ed25519-signed attestation with a verdict ('pass'), the overall surface_digest (sha256 over all tools), per-tool digests keyed by tool name, the tool count, and a key_id identifying the signing key. This signed attestation can be stored as a trusted baseline and compared against future snapshots to detect drift or tampering.
Example use cases
Pin MCP server before deployment
“Before I deploy this MCP server to production, compute a signed attestation of its full tools/list — all the tool names, descriptions, and inputSchemas — so I have a trusted baseline I can verify against later.”
Detect tool description rug pull
“I want to make sure nobody has silently rewritten any of my MCP tool descriptions since I last checked. Pin the current tools/list now so I can diff it against the signed digest I stored last week.”
Compliance audit of agent tool surface
“For our security audit, I need a cryptographically signed record of exactly what tools our MCP server exposes right now — every tool name, description, and schema — with an ed25519 attestation I can hand to the auditors.”
Technical details
Endpoint
POSThttps://witness.holoweave.org/v1/mcp-digestWhen to prefer
Use this endpoint when you need a cryptographically signed, tamper-evident snapshot of an MCP server's tool surface at a point in time — especially before deployment, before and after updates, or when establishing a baseline for ongoing drift detection. Prefer this over the companion drift-detection endpoint when you want to CREATE the baseline rather than compare against one. Choose this over ad-hoc hashing because the ed25519 attestation is independently verifiable and externally signed.
Side effects
- Empty or malformed tools array returns an error or digest with tool_count 0
- Missing required 'name' field on any tool item causes a validation error
- Network/payment failure (x402 micropayment not completed) blocks the response
- Malformed inputSchema objects may be excluded or cause serialization errors
- If the signing key is rotated, old attestations will reference a deprecated key_id
Output
Schema · Response
{
"example": {
"signature": {
"alg": "ed25519",
"value": "base64...",
"key_id": "aw-attest-2026-08"
},
"attestation": {
"verdict": "pass",
"endpoint": "mcp-digest",
"evidence": {
"tools": {
"search": "3ac1…"
},
"digest_alg": "sha256",
"tool_count": 1,
"surface_digest": "9f2b…"
}
}
}
}Tags
x402
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