Fetter MCP MCP server

A remote MCP server that provides AI coding agents with real-time access to Python package vulnerability data. It queries PyPI and OSV to surface known CVEs, CVSS scores, and safe versions, enabling agents to make informed dependency decisions during code writing and auditing.

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 Fetter IO

MCP endpoint (Streamable HTTP)

https://mcp.fetter.io/mcp

Vendor documentation

What you can do with it

Find the latest release of a package that is free of known vulnerabilities
Check whether a specific pinned version has known CVEs
Find available versions and their vulnerabilities for any package or specifier

Tools advertised by the last live check:

lookup
is_vulnerable
most_recent_not_vulnerable

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 fetter-mcp https://mcp.fetter.io/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 fetter-mcp --url https://mcp.fetter.io/mcp

Cursor

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

Cursor configuration

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

VS Code

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

VS Code configuration

{
  "servers": {
    "fetter-mcp": {
      "type": "http",
      "url": "https://mcp.fetter.io/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 fetter-mcp https://mcp.fetter.io/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": {
    "fetter-mcp": {
      "url": "https://mcp.fetter.io/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": {
    "fetter-mcp": {
      "serverUrl": "https://mcp.fetter.io/mcp"
    }
  }
}

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