{
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-05",
    "license": "CC-BY-4.0",
    "method": "https://www.anchorterminal.com/benchmark/",
    "methodology": "0.3",
    "openapi": "https://www.anchorterminal.com/openapi.json",
    "preview": false,
    "run": "2026-10-01",
    "runLabel": "October 2026 research run"
  },
  "tool": {
    "category": "",
    "endpoint": "https://mcp.pcrzero.com/mcp",
    "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/pcrzero-mcp.json",
    "kind": "mcp",
    "listed": "indexed",
    "liveUrl": "https://www.anchorterminal.com/api/v1/live/pcrzero-mcp.json",
    "markdownUrl": "https://www.anchorterminal.com/tools/pcrzero-mcp.md",
    "mcpTools": {
      "check": {
        "checker": "anchor-check/1.0",
        "totalTokens": 758,
        "counts": {
          "error": 0,
          "note": 1,
          "warn": 5
        },
        "findings": [
          {
            "rule": "TC11",
            "severity": "warn",
            "tool": "issue_receipt",
            "message": "1 parameter without a description: nonce",
            "fix": "Describe each one: format, units, an example, and what happens when it's left out."
          },
          {
            "rule": "TC11",
            "severity": "warn",
            "tool": "verify_receipt",
            "message": "1 parameter without a description: conformance",
            "fix": "Describe each one: format, units, an example, and what happens when it's left out."
          },
          {
            "rule": "TC16",
            "severity": "warn",
            "tool": "get_keyset",
            "message": "no readOnlyHint or destructiveHint",
            "fix": "Its name starts with \"get\"; if it only reads, set readOnlyHint: true so harnesses can run it without asking."
          },
          {
            "rule": "TC16",
            "severity": "warn",
            "tool": "issue_receipt",
            "message": "no readOnlyHint or destructiveHint",
            "fix": "Set readOnlyHint: true if it only reads; otherwise set destructiveHint and idempotentHint."
          },
          {
            "rule": "TC16",
            "severity": "warn",
            "tool": "verify_receipt",
            "message": "no readOnlyHint or destructiveHint",
            "fix": "Set readOnlyHint: true if it only reads; otherwise set destructiveHint and idempotentHint."
          },
          {
            "rule": "TC24",
            "severity": "note",
            "message": "3 of 3 tools have no outputSchema",
            "fix": "Declare outputSchema for tools that return structured data, and return structuredContent that matches it."
          }
        ]
      },
      "checkedAt": "2026-10-04T22:23:33Z",
      "count": 3,
      "note": "last answer error: initialize: HTTP 404; tools as last listed",
      "schemaTokens": 758,
      "status": "ok",
      "tools": [
        {
          "name": "issue_receipt",
          "description": "Adjudicates an attestation document against a policy and returns the verdict together with a signed receipt pair — the durable, independently checkable proof that this decision was made, by these keys, over this document. **Metered: every call bills one `receipt_verifications` unit against the API key configured for this server, and a `fail` verdict bills exactly like a `pass`. You are paying for the adjudication, not for the answer you wanted.** This is the only tool here that spends. If you already hold a receipt and want to know whether it is genuine, that is `verify_receipt`, which is free and needs no key.",
          "inputSchema": {
            "$schema": "http://json-schema.org/draft-07/schema#",
            "additionalProperties": false,
            "properties": {
              "document": {
                "description": "Base64 attestation document (single-document form).",
                "type": "string"
              },
              "documents": {
                "description": "Base64 attestation documents (batch form).",
                "items": {
                  "type": "string"
                },
                "type": "array"
              },
              "nonce": {
                "type": "string"
              },
              "policy": {
                "additionalProperties": {},
                "description": "Inline policy object (API wire shape).",
                "type": "object"
              },
              "policy_id": {
                "description": "Stored policy id (pol_…).",
                "type": "string"
              },
              "receipt": {
                "description": "Request a signed receipt (default true).",
                "type": "boolean"
              }
            },
            "type": "object"
          }
        },
        {
          "name": "verify_receipt",
          "description": "Checks a PCRZERO receipt pair against the signing keyset: whether the signature holds, and whether the receipt says what it appears to say. **Free, with no API key and no account, and it stays free.** Offline by default — supply `keyset` and this call touches the network not at all; omit it and the server fetches the public keyset from api.pcrzero.com once. The result field `keyset_source` tells you which of the two happened, every time. This tool issues nothing, bills nothing, and cannot spend. It is the half of PCRZERO you never pay for.",
          "inputSchema": {
            "$schema": "http://json-schema.org/draft-07/schema#",
            "additionalProperties": false,
            "properties": {
              "conformance": {
                "enum": [
                  "full",
                  "classical-only"
                ],
                "type": "string"
              },
              "keyset": {
                "additionalProperties": false,
                "description": "Optional keyset in GET /v1/keys shape. When supplied, no network is used.",
                "properties": {
                  "keys": {
                    "items": {
                      "additionalProperties": {},
                      "type": "object"
                    },
                    "type": "array"
                  }
                },
                "required": [
                  "keys"
                ],
                "type": "object"
              },
              "receipt": {
                "description": "Base64url receipt envelope from issue_receipt / the API.",
                "type": "string"
              }
            },
            "required": [
              "receipt"
            ],
            "type": "object"
          }
        },
        {
          "name": "get_keyset",
          "description": "Returns the current PCRZERO signing keyset — key ids, public halves, and each key's status. Public and unauthenticated: no API key, no cost, no account. This is the same document an outside party fetches to check a PCRZERO receipt without trusting us, and fetching it is how you stop taking our word for anything.",
          "inputSchema": {
            "$schema": "http://json-schema.org/draft-07/schema#",
            "properties": {},
            "type": "object"
          }
        }
      ]
    },
    "name": "pcrzero.com MCP server",
    "note": "Indexed from the official MCP registry: facts and our own checks, not reviewed, so no score, grade or rank.",
    "packages": [
      {
        "registryType": "npm",
        "identifier": "@scytalex-llc/pcrzero-mcp",
        "version": "0.2.0",
        "transport": "stdio"
      },
      {
        "registryType": "npm",
        "identifier": "@scytalex-llc/pcrzero-mcp",
        "version": "0.2.0",
        "transport": "streamable-http"
      }
    ],
    "pageJsonUrl": "https://www.anchorterminal.com/tools/pcrzero-mcp.json",
    "popularity": {
      "npmWeekly": 46
    },
    "registryName": "com.pcrzero/mcp",
    "remotes": [
      {
        "type": "streamable-http",
        "url": "https://mcp.pcrzero.com/mcp"
      }
    ],
    "repository": "https://github.com/Scytalex-LLC/pcrzero-mcp",
    "reviewed": false,
    "slug": "pcrzero-mcp",
    "source": "the official MCP registry",
    "sourceUrl": "https://registry.modelcontextprotocol.io/v0.1/servers?search=com.pcrzero/mcp",
    "summary": "Issue signed receipts for AI agent actions; verify any receipt offline - free, no account.",
    "updatedAt": "2026-08-13T04:37:31Z",
    "url": "https://www.anchorterminal.com/tools/pcrzero-mcp",
    "vendor": "pcrzero.com",
    "vendorUrl": "https://pcrzero.com/mcp",
    "version": "0.2.0",
    "websiteUrl": "https://pcrzero.com/mcp",
    "where": "both",
    "why": [
      "vendor"
    ]
  }
}