# pcrzero.com MCP server (slim)

> 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.

- Full: https://www.anchorterminal.com/tools/pcrzero-mcp.md (~800 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/tools/pcrzero-mcp.json · canonical https://www.anchorterminal.com/tools/pcrzero-mcp
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

# pcrzero.com MCP server

> 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/

- Kind: MCP server, by pcrzero.com (https://pcrzero.com/mcp)
- Listed because: It's published in the registry under pcrzero.com, a namespace the registry only gives to whoever proves they control that domain.
- What the official MCP registry says: Issue signed receipts for AI agent actions; verify any receipt offline - free, no account.

## Facts

- MCP registry: `com.pcrzero/mcp` 0.2.0
- Endpoint: https://mcp.pcrzero.com/mcp (streamable HTTP)
- Package: npm `@scytalex-llc/pcrzero-mcp` (stdio)
- Package: npm `@scytalex-llc/pcrzero-mcp` (streamable-http)
- Source: https://github.com/Scytalex-LLC/pcrzero-mcp
- Website: https://pcrzero.com/mcp
- npm downloads a week: 46
- Registry entry updated: 2026-08-13

## Tools

- 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):
  - `issue_receipt`: Adjudicates an attestation document against a policy and returns the verdict together with a signed receipt pair — the durable, independently checkable proof…
  - `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…
  - `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…
- 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):
  - warn TC11 issue_receipt: 1 parameter without a description: nonce
  - warn TC11 verify_receipt: 1 parameter without a description: conformance
  - warn TC16 get_keyset: no readOnlyHint or destructiveHint
  - warn TC16 issue_receipt: no readOnlyHint or destructiveHint
  - warn TC16 verify_receipt: no readOnlyHint or destructiveHint
  - note TC24 server: 3 of 3 tools have no outputSchema

- JSON: https://www.anchorterminal.com/api/v1/tools/pcrzero-mcp.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming