lazaretto-mcp

An MCP server that lets an agent verify a skill, tool, or package before it installs it. It is a thin front end for the Lazaretto API. It ships no detection logic and does nothing but make HTTPS requests, so it is easy to audit.

Tools

check_lockfile (free, no API key)

Checks every exactly-pinned dependency in your lockfile against published malicious-package advisories. Reads package-lock.json, yarn.lock, or pnpm-lock.yaml from the working directory, so the agent never has to paste a lockfile through its context. One call covers the whole tree.

An empty malicious list is an all-clear only when unverified is also empty.

• known_bad_lookup: free, no key. Is a sha256 content hash a known-bad artifact? Exact-hash match against an indicator store refreshed daily.
• scan_artifact: fetches a target (npm package, GitHub repo, ClawHub skill, raw URL, or inline text) without running it and returns a deterministic verdict (malicious, flagged, clear, error) with evidence. A full scan needs prepaid credits (set an X-API-Key header). Buy them at https://lazaretto.dev/#pricing.

Reports are signals with evidence, not a warranty. clear means no known-bad match and no rule fired. It is not a statement about risk.

Use it (hosted, zero install)

The server is hosted at https://lazaretto.dev/mcp. Add it to any MCP client that supports remote (Streamable HTTP) servers. Nothing to install, no local process.

{
  "mcpServers": {
    "lazaretto": {
      "url": "https://lazaretto.dev/mcp",
      "headers": {
        "X-API-Key": "your-prepaid-key (optional; known_bad_lookup is free)"
      }
    }
  }
}

known_bad_lookup works with no key. scan_artifact needs credits: buy a bundle at https://lazaretto.dev/#pricing (an agent can also do this itself over x402 at POST https://lazaretto.dev/v1/credits/topup).

Self-host the stdio server (optional)

If you would rather run it locally over stdio instead of the hosted URL:

git clone https://github.com/jamesdfinance-dev/lazaretto-mcp
cd lazaretto-mcp && npm install
LAZARETTO_API_KEY=your-key node index.mjs

LAZARETTO_BASE_URL overrides the API host (default https://lazaretto.dev).

License

MIT. The Lazaretto service and its detection engine are separate and proprietary.