{
  "data": {
    "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"
      ]
    }
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/tools/pcrzero-mcp",
    "json": "https://www.anchorterminal.com/tools/pcrzero-mcp.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
    "markdown": "https://www.anchorterminal.com/tools/pcrzero-mcp.md",
    "slim": "https://www.anchorterminal.com/tools/pcrzero-mcp.min.md"
  },
  "markdown": "# pcrzero.com MCP server\n\n\u003e Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/\n\n- Kind: MCP server, by pcrzero.com (https://pcrzero.com/mcp)\n- Listed because: It's published in the registry under pcrzero.com, a namespace the registry only gives to whoever proves they control that domain.\n- What the official MCP registry says: Issue signed receipts for AI agent actions; verify any receipt offline - free, no account.\n\n## Facts\n\n- MCP registry: `com.pcrzero/mcp` 0.2.0\n- Endpoint: https://mcp.pcrzero.com/mcp (streamable HTTP)\n- Package: npm `@scytalex-llc/pcrzero-mcp` (stdio)\n- Package: npm `@scytalex-llc/pcrzero-mcp` (streamable-http)\n- Source: https://github.com/Scytalex-LLC/pcrzero-mcp\n- Website: https://pcrzero.com/mcp\n- npm downloads a week: 46\n- Registry entry updated: 2026-08-13\n\n## Tools\n\n- Tools it lists (3, about 758 tokens of context, `tools/list` without credentials over MCP 2025-11-25, checked 2026-10-04 22:23 UTC):\n  - `issue_receipt`: Adjudicates an attestation document against a policy and returns the verdict together with a signed receipt pair — the durable, independently checkable proof…\n  - `verify_receipt`: 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…\n  - `get_keyset`: 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…\n- How its tools read to an agent (0 errors, 5 warnings, 1 note, about 758 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):\n  - warn TC11 issue_receipt: 1 parameter without a description: nonce\n  - warn TC11 verify_receipt: 1 parameter without a description: conformance\n  - warn TC16 get_keyset: no readOnlyHint or destructiveHint\n  - warn TC16 issue_receipt: no readOnlyHint or destructiveHint\n  - warn TC16 verify_receipt: no readOnlyHint or destructiveHint\n  - note TC24 server: 3 of 3 tools have no outputSchema\n\n- JSON: https://www.anchorterminal.com/api/v1/tools/pcrzero-mcp.json\n- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming\n",
  "meta": {
    "attribution": "Anchor Terminal (https://www.anchorterminal.com)",
    "docs": "https://www.anchorterminal.com/docs/",
    "generatedAt": "2026-10-04",
    "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"
  },
  "page": {
    "breadcrumbs": [
      {
        "name": "Home",
        "url": "https://www.anchorterminal.com/"
      },
      {
        "name": "Terminal",
        "url": "https://www.anchorterminal.com/tools/"
      },
      {
        "name": "Indexed",
        "url": "https://www.anchorterminal.com/indexed/"
      },
      {
        "name": "pcrzero.com MCP server",
        "url": ""
      }
    ],
    "description": "pcrzero.com MCP server, an MCP server by pcrzero.com, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Issue signed receipts for AI agent actions; verify any receipt offline - free, no account.",
    "facts": [
      "not reviewed",
      "not ranked",
      "facts only"
    ],
    "h1": "pcrzero.com MCP server",
    "image": "https://www.anchorterminal.com/assets/og/indexed.png",
    "path": "/tools/pcrzero-mcp",
    "published": "",
    "section": "indexed",
    "title": "pcrzero.com MCP server, indexed from the official MCP registry",
    "toc": null,
    "updated": "2026-10-04",
    "url": "https://www.anchorterminal.com/tools/pcrzero-mcp"
  },
  "tokens": {
    "markdown": 800,
    "slim": 730
  },
  "version": 1
}