https://github.com/MCP-Defender/MCP-Defender

Desktop app that automatically scans and blocks malicious MCP traffic in AI apps like Cursor, Claude, VS Code and Windsurf.
https://github.com/MCP-Defender/MCP-Defender

ai-tools mcp mcp-client mcp-client-security mcp-security mcp-server mcp-tools model-context-protocol

Last synced: 3 months ago
JSON representation

Desktop app that automatically scans and blocks malicious MCP traffic in AI apps like Cursor, Claude, VS Code and Windsurf.

• Host: GitHub
• URL: https://github.com/MCP-Defender/MCP-Defender
• Owner: MCP-Defender
• License: agpl-3.0
• Created: 2025-05-28T13:52:30.000Z (4 months ago)
• Default Branch: main
• Last Pushed: 2025-06-19T18:06:28.000Z (4 months ago)
• Last Synced: 2025-06-19T18:37:15.487Z (4 months ago)
• Topics: ai-tools, mcp, mcp-client, mcp-client-security, mcp-security, mcp-server, mcp-tools, model-context-protocol
• Language: TypeScript
• Homepage: https://mcpdefender.com
• Size: 1.58 MB
• Stars: 81
• Watchers: 0
• Forks: 10
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE
  • Codeowners: .github/CODEOWNERS

Awesome Lists containing this project

• awesome-mcp-security - MCP Defender - Blocks malicious MCP traffic

README

          


  

    

    

    

  



MCP Defender

Automatically protects MCP traffic in AI apps




  

  

  

  



🛡️  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](https://github.com/MCP-Defender/MCP-Defender/releases/latest)

Windows & Linux Coming Soon

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

```bash

# Install dependencies

npm install

# Start app

npm start

```

## Which apps are automatically protected?

MCP Defender protects Cursor, Claude, Visual Studio Code and Windsurf.

Protection for more apps coming soon!

## Contributing

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

## License

MCP Defender is licensed under the AGPL-3.0 license. For more details, see the [LICENSE](LICENSE).