MCP Defender

MCP Defender is a desktop application designed to automatically secure AI apps like Cursor, Claude, Visual Studio Code, and Windsurf from various attacks. It functions as an AI Firewall, monitoring and protecting Model Context Protocol (MCP) communications by intercepting tool calls and responses. It verifies these against security signatures and alerts the user if it detects any malicious activity, allowing them to block or allow the action. It provides intelligent LLM-powered threat detection and acts as a secure proxy, analyzing communications in real-time.

How to Use

MCP Defender is a desktop application that users download and install. Once active, it automatically acts as a secure proxy between your AI applications and MCP servers. It analyzes all communications for potential threats in real-time. If malicious activity is detected, it alerts the user, who can then choose to block or allow the action. It supports managing security signatures used during scanning.

MCP Defender's

Key Features

• AI Firewall for AI apps
• Intelligent LLM-powered Threat Detection
• Scan Control for managing security signatures
• Automatic real-time protection of MCP tool calls
• Intercepts and verifies tool calls and responses
• Supports multiple AI applications (Cursor, Claude, VS Code, Windsurf)
• Open Source

Use Cases

• Protecting AI applications from malicious instructions or actions.
• Blocking common AI security threats such as Prompt Injection, Credential Theft, Arbitrary Code Execution, and Remote Command Injection.
• Monitoring and verifying Model Context Protocol (MCP) communications for security breaches.
• Securing development environments that utilize AI tools like VS Code.