The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
MCP Defender
Desktop app that automatically scans and blocks malicious MCP traffic in AI apps like Cursor, Claude, VS Code and Windsurf.
Install
$
git clone https://github.com/MCP-Defender/MCP-DefenderInstall command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →MCP Defender Automatically protects MCP traffic in AI apps
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
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.
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