Lazaretto MCP MCP server

Lazaretto MCP provides deterministic pre-install verification for npm packages, AI agent skills, and MCP tools. It checks dependencies against malicious-package advisories and offers paid behavioral scans for credential theft, exfiltration, and prompt injection. The server returns signed attestations that agents can verify offline, ensuring security without requiring local installation or account creation for basic checks.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Lazaretto

MCP endpoint (Streamable HTTP)

https://lazaretto.dev/mcp

Vendor documentation

What you can do with it

Check npm lockfiles for known malware advisories
Scan MCP servers for poisoning and shadowing risks
Verify signed attestations offline
Get behavioral analysis of agent skills

Tools advertised by the last live check:

known_bad_lookup
check_lockfile
scan_artifact
scan_lockfile_deep
scan_mcp_server
check_mcp_tools
find_attestation
verify_attestation
get_free_key

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http lazaretto-mcp https://lazaretto.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add lazaretto-mcp --url https://lazaretto.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable lazaretto-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "lazaretto-mcp": {
      "url": "https://lazaretto.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "lazaretto-mcp": {
      "type": "streamableHttp",
      "url": "https://lazaretto.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start lazaretto-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "lazaretto-mcp": {
      "type": "http",
      "url": "https://lazaretto.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http lazaretto-mcp https://lazaretto.dev/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "lazaretto-mcp": {
      "url": "https://lazaretto.dev/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "lazaretto-mcp": {
      "serverUrl": "https://lazaretto.dev/mcp"
    }
  }
}

See all 957

Do you run Lazaretto MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing