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8 clients · secrets stay placeholders

JSON (mcpServers)Claude CodeCodexOpenCodeCursorVS CodeGemini CLIGoose

{
  "mcpServers": {
    "pcrzero": {
      "type": "http",
      "url": "https://mcp.pcrzero.com/mcp",
      "headers": {
        "Authorization": "Bearer ${PCRZERO_TOKEN}"
      }
    }
  }
}

claude mcp add --transport http pcrzero https://mcp.pcrzero.com/mcp --header "Authorization: Bearer ${PCRZERO_TOKEN}"

[mcp_servers.pcrzero]
url = "https://mcp.pcrzero.com/mcp"
bearer_token_env_var = "PCRZERO_TOKEN"

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pcrzero": {
      "type": "remote",
      "url": "https://mcp.pcrzero.com/mcp",
      "enabled": true,
      "headers": {
        "Authorization": "Bearer {env:PCRZERO_TOKEN}"
      }
    }
  }
}

{
  "mcpServers": {
    "pcrzero": {
      "type": "http",
      "url": "https://mcp.pcrzero.com/mcp",
      "headers": {
        "Authorization": "Bearer ${PCRZERO_TOKEN}"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=pcrzero&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vbWNwLnBjcnplcm8uY29tL21jcCIsImhlYWRlcnMiOnsiQXV0aG9yaXphdGlvbiI6IkJlYXJlciAke1BDUlpFUk9fVE9LRU59In19"
}

{
  "servers": {
    "pcrzero": {
      "type": "http",
      "url": "https://mcp.pcrzero.com/mcp",
      "headers": {
        "Authorization": "Bearer ${PCRZERO_TOKEN}"
      }
    }
  }
}

{
  "mcpServers": {
    "pcrzero": {
      "httpUrl": "https://mcp.pcrzero.com/mcp",
      "headers": {
        "Authorization": "Bearer ${PCRZERO_TOKEN}"
      }
    }
  }
}

extensions:
  "pcrzero":
    enabled: true
    name: "pcrzero"
    type: streamable_http
    uri: "https://mcp.pcrzero.com/mcp"
    headers:
      "Authorization": "Bearer ${PCRZERO_TOKEN}"
    timeout: 300

Placeholders to fill from your own secret store: ${PCRZERO_TOKEN}. The registry never accepts secret values.

Quality 77 / 100good

protocol75 · weight 25

warn
protocol.modernnewest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
n/a
protocol.statelessonly applies to 2026-07-28 servers
pass
protocol.transportstreamable HTTP
n/a
protocol.list_ttlonly applies to 2026-07-28 servers

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygiene71 · weight 30

pass
tools.descriptionsevery tool has a description
pass
tools.description_lengthdescriptions are concise
pass
tools.schemasevery tool has an object input schema
fail
tools.annotationsno tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
fail
tools.directory_hintsno tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: verify_receipt (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_keyset (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); issue_receipt (readOnlyHint, destructiveHint, idempotentHint, openWorldHint)
pass
tools.token_costabout 697 tokens to load every tool
pass
tools.api_dumptools are not a one-to-one API dump

stability100 · weight 15

pass
stability.changesno tool changes in 30 days
pass
stability.rug_pullno tool changed its meaning under the same name

dependencies67 · weight 15

pass
deps.known_vulnsno known advisory in 196 resolved packages
fail
deps.mcp_sdk_version@modelcontextprotocol/sdk 1.30.1 has 1 known advisory (GHSA-6qxp-vccf-f47h); update @modelcontextprotocol/sdk to 1.31.0 or later
pass
deps.resolvable@scytalex-llc/[email protected], @scytalex-llc/[email protected] resolved: 196 packages

3 tools, about 697 tokens to load them all · tool set 411a743fbec5 · checked 2026-10-20 09:31 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 63 / 100

provenance85

liveness0

freshness85

hygiene100

+repository +dns-namespace +website -unreachable(7 failures) ~updated-68d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

@scytalex-llc/[email protected] npm97 dependencies, resolved · MCP SDK @modelcontextprotocol/sdk 1.30.1 · advisories checked 2026-10-19

advisory	severity	package	fixed in
GHSA-6qxp-vccf-f47hMCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server	high	`@modelcontextprotocol/[email protected]`MCP SDK, direct	fixed in `1.31.0`

@scytalex-llc/[email protected] npm97 dependencies, resolved · MCP SDK @modelcontextprotocol/sdk 1.30.1 · advisories checked 2026-10-19

advisory	severity	package	fixed in
GHSA-6qxp-vccf-f47hMCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server	high	`@modelcontextprotocol/[email protected]`MCP SDK, direct	fixed in `1.31.0`

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

remote	auth	reachable	uptime 30d	p50	protocol	last ok
`https://mcp.pcrzero.com/mcp` streamable-http	none	no (7 failures)	88%	190 ms	2025-11-25	2026-10-04

package	registry	version	runtime	secrets
`@scytalex-llc/pcrzero-mcp`	npm	0.2.0	–	`PCRZERO_API_KEY`
`@scytalex-llc/pcrzero-mcp`	npm	0.2.0	–	`PCRZERO_API_KEY`

Tools (3)

`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 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.
`issue_receipt`	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.
`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 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.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "com.pcrzero/mcp",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "remotes": [
    {
      "url": "https://mcp.pcrzero.com/mcp",
      "type": "streamable-http",
      "headers": [
        {
          "name": "Authorization",
          "format": "string",
          "isSecret": true,
          "description": "Bearer ak_live_… / ak_test_…. Required only for issue_receipt. verify_receipt and get_keyset work without it."
        }
      ]
    }
  ],
  "version": "0.2.0",
  "packages": [
    {
      "version": "0.2.0",
      "transport": {
        "type": "stdio"
      },
      "identifier": "@scytalex-llc/pcrzero-mcp",
      "registryType": "npm",
      "environmentVariables": [
        {
          "name": "PCRZERO_API_KEY",
          "format": "string",
          "isSecret": true,
          "description": "PCRZERO API key (ak_live_… / ak_test_…). Optional for stdio free tools; required for issue_receipt. In streamable-http client_key mode, prefer per-request Authorization header instead."
        }
      ]
    },
    {
      "version": "0.2.0",
      "transport": {
        "url": "http://127.0.0.1:3333/mcp",
        "type": "streamable-http"
      },
      "identifier": "@scytalex-llc/pcrzero-mcp",
      "registryType": "npm",
      "environmentVariables": [
        {
          "name": "PCRZERO_MCP_TRANSPORT",
          "format": "string",
          "description": "Set to http to enable streamable-http transport (default stdio)."
        },
        {
          "name": "PCRZERO_MCP_AUTH_MODE",
          "format": "string",
          "description": "HTTP auth mode: client_key (default, per-request API key header — required for remote/Bazaar) or env_key (loopback sidecar only)."
        },
        {
          "name": "PCRZERO_API_KEY",
          "format": "string",
          "isSecret": true,
          "description": "Optional process env API key for env_key (loopback) mode only. Never used as a shared multi-client key in client_key mode. issue_receipt always requires a key."
        }
      ]
    }
  ],
  "repository": {
    "url": "https://github.com/Scytalex-LLC/pcrzero-mcp",
    "source": "github"
  },
  "websiteUrl": "https://pcrzero.com/mcp",
  "description": "Issue signed receipts for AI agent actions; verify any receipt offline - free, no account."
}

Pcrzero