MCP Server / Defender
Defender
Desktop app that automatically scans and blocks malicious MCP traffic in AI apps like Cursor, Claude, VS Code and Windsurf.
Installation
claude mcp add defender -- npx -y mcp-defender
npx -y mcp-defender
npm: mcp-defender
Transport
Dokumentation
🛡️ MCP Defender is a desktop app that protects AI apps like Cursor from a variety of attacks.
🚦 All MCP tool call requests and responses from AI apps are automatically proxied through MCP Defender.
🔎 The intercepted data is then checked against a set of signatures.
🔐 If anything harmful is detected, MCP Defender alerts you and asks if you want to allow or block the tool call.
Demos
https://github.com/user-attachments/assets/363ae2b1-e395-4cdc-b5ca-e9862baf89c3
Quick Start
Alternatively you can clone the git repo, and run it as follows:
# Install dependencies
npm install
# Start app
npm start
Which apps are automatically protected?
MCP Defender protects Cursor, Claude, Visual Studio Code and Windsurf.
License
MCP Defender is licensed under the AGPL-3.0 license. For more details, see the LICENSE.