MCP Defender
Supports UIby mcp-defender
Protects AI apps by scanning and blocking malicious MCP traffic in real-time.
What it does
MCP Defender acts as a security proxy for Model Context Protocol (MCP) traffic. It intercepts tool call requests and responses from AI applications, checking them against a set of known malicious signatures to prevent prompt injection, unauthorized file access, and command execution attacks.
Tools
- Traffic Proxy: Automatically intercepts all MCP communication for real-time analysis.
- Signature Matching: Checks intercepted data against deterministic signatures to identify harmful patterns.
- Interactive Alerts: Notifies the user when a potentially malicious call is detected and requests explicit permission to allow or block it.
Installation
Install the desktop application and configure your AI client to proxy traffic through MCP Defender. For Claude Desktop, add the proxy configuration to your claude_desktop_config.json.
Supported hosts
Confirmed support for Cursor, Claude, Visual Studio Code, and Windsurf.
Quick install
npm install -g mcp-defenderInformation
- Pricing
- free
- Published
- 4/13/2026
- stars
- 0
Categories
Choose your AI client and follow the steps below.
Cursor
Add the MCP Defender proxy to the MCP settings in Cursor.Windsurf
Configure mcp_config.json to route traffic through the defender proxy.Claude Desktop
Configure the MCP server to use the MCP Defender proxy executable.Related Apps
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