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fosterrx-verify-mcp-server

by gfoster12
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fosterrx-verify-mcp-server

A read-only MCP server that verifies Foster Rx certificates using public material only: the world-readable certificate envelope and the Ed25519 trust anchor published at https://fosterrx.com/.well-known/angis-signing-key-v1.pub.

No credential exists anywhere in this codebase. That is not a deployment choice but the product's argument in server form: verification that required Foster Rx's permission would not be verification. This repository being public and auditable is part of the same argument.

Tools

Tool

What it does

fosterrx_verify_certificate

Real Ed25519 verification of the signed canonical bytes against the live trust anchor. Verdicts: verified / signature_invalid / not_found / tool_fault.

fosterrx_get_certificate_record

The full signed canonical, decoded verbatim. No verification performed; nothing renamed or improved on.

fosterrx_get_trust_anchor

The published public key, plus instructions for verifying with no Foster Rx software at all.

Related MCP server: VouchSpec Catalog MCP

Verdict discipline

  • not_found is not invalid. An unpublished certificate is a fact about the public register, never a claim about any artifact.

  • tool_fault is not invalid. A network failure or malformed input is a fact about this tool's run and says nothing about the certificate.

  • signature_invalid is asserted only after Ed25519 arithmetic failed over the signed bytes under the published key.

  • Both issued identifier shapes are accepted (FRXS-<16 hex> and FRXS-<uuid>); a pattern inferred from only one of them has previously rejected every real certificate.

Run

npm ci && npm run build
PORT=8080 node dist/index.js     # MCP endpoint at POST /mcp, health at /healthz

Deploy (Cloud Run)

gcloud run deploy fosterrx-verify-mcp --source . \
  --region us-east4 --project fosterrx-prod --allow-unauthenticated

Public, unauthenticated, by design: it can only read what the world can already read.

Verify with your own AI

This server is public. Anyone can register it and verify any published Foster Rx certificate — no account, no permission:

  1. In Claude (or any MCP client): add a custom connector with URL https://fosterrx-verify-mcp-630726936307.us-east4.run.app/mcp

  2. Ask: verify FRXS-5330F9E368BA4536

  3. The reader gets the cryptographic verdict — not the issuer's word.

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivityMaintained
ResponsivenessNo issues

Resources

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