Agentic Firewall
An intelligent firewall system with agent-based decision making
Agentic Firewall is a lightweight security wrapper that intercepts and validates Model Context Protocol (MCP) tool calls before they reach AI agents like Claude. Think of it as a firewall for your AI coding environment—providing granular access control and visibility into what your AI agents are doing.
The Problem
Recent security research revealed a critical vulnerability in AI coding environments: autonomous AI agents can be compromised when they’re allowed to connect to unverified tools and execute thousands of requests without human oversight. The attack succeeded because there was no “human-in-the-loop” to verify intent before execution.
The Solution
Agentic Firewall prevents these attacks by acting as a security checkpoint. It provides the governance layer needed to safely leverage AI assistance without sacrificing control over your development environment.
Key Features
- Tool Whitelisting: Only approved tools can be executed
- Sandbox Enforcement: Restrict file operations to specific directories
- Path Traversal Protection: Blocks
../and absolute path attacks - Audit Logging: Complete visibility into allowed/blocked requests
- Zero Latency: Transparent proxying with minimal overhead
- Policy-Driven: Configure security rules via simple JSON
Architecture
┌─────────────────┐
│ Claude Desktop │
└────────┬────────┘
│ JSON-RPC
▼
┌─────────────────────────┐
│ Agentic Firewall │
│ (mcp_governor.py) │
│ │
│ ┌─────────────────┐ │
│ │ Policy Engine │ │
│ │ - Whitelist │ │
│ │ - Validation │ │
│ │ - Sandbox Check │ │
│ └─────────────────┘ │
│ │ │
│ ┌─────────────────┐ │
│ │ Audit Logger │────┼──► threat_log.txt
│ └─────────────────┘ │
└────────┬────────────────┘
│ Filtered Requests
▼
┌─────────────────────────┐
│ MCP Server │
│ (filesystem/weather) │
└─────────────────────────┘
Technologies Used
- Language: Python
- Protocol: Model Context Protocol (MCP), JSON-RPC
- Core Concepts: Agent-based Systems, Network Security, Sandboxing