MCP Defender

<p align="center"> <picture> <source media="(prefers-color-scheme: dark)" srcset="./src/assets/white_knight_icon.png"> <source media="(prefers-color-scheme: light)" srcset="./src/assets/black_knight_icon.png"> <img alt="Shows a black knight in light color mode and a white knight one in dark color mode." src="./src/assets/white_knight_icon.png" width="200" height="200"> </picture> </p> <h1 align="center">MCP Defender</h1> <h2 align="center">Automatically protects MCP traffic in AI apps</h2> <p align="center"> <a href="LICENSE"><img src="https://img.shields.io/github/license/MCP-Defender/MCP-Defender" alt="GitHub License"></a> </p> <h1 align="center"><a href="https://www.docker.com/blog/docker-acquires-mcp-defender-ai-agent-security/">MCP Defender has been acquired by Docker Inc.</a></h1>

🛡️ 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

Download MCP Defender for Mac

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.