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MCP Defender

MCP-Defender/MCP-Defender · 255 stars · TypeScript · AGPL-3.0

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

Install

The repo has no one-line install. Follow its README.

Open the repo

Files

README.md

MCP Defender

Automatically protects MCP traffic in AI apps

GitHub License

MCP Defender has been acquired by Docker Inc.

🛡️ 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

MCP.Defender.Small.mp4

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.

Facts

Kind
MCP server
Repo
MCP-Defender/MCP-Defender
Group
Uncategorized
Stars
255
License
AGPL-3.0
Language
TypeScript
Last push
2026-06-05
Forks
44
Homepage
mcpdefender.com
Topics
ai-tools, mcp, mcp-security, mcp-tools, mcp-client, mcp-client-security, mcp-server, model-context-protocol

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