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MCP Defender

Automatically protects MCP traffic in AI apps

🛡️ MCP Defender is a desktop application that automatically protects your computer from malicious MCP traffic.

🚦 All MCP tool call requests and responses from AI apps like Cursor, Claude and Windsurf are automatically proxied through MCP Defender.

🔎 The intercepted data is then checked against security signatures - if anything harmful is detected, MCP Defender will alert you and ask if you want to allow or block the tool call from proceeding.

Demos

https://github.com/user-attachments/assets/363ae2b1-e395-4cdc-b5ca-e9862baf89c3

Quick Start

Download MCP Defender for Mac

Windows & Linux Coming Soon

Alternatively you can clone the git repo, and run it as follows:

# Install dependencies
npm install

# Start app
npm start

Contributing

We love contributions! Feel free to open issues for bugs or feature requests.

License

MCP Defender is CC BY-NC-SA 4.0 licensed.