ThornGuard

ThornGuard is a security proxy for AI agents that use MCP (Model Context Protocol) to connect to external tools. It sits between the AI client and the MCP servers it talks to, inspecting every tool response before the model sees it. Most MCP setups today pass tool responses straight into the model’s context window with nothing in between. That means a compromised or malicious MCP server can hide instructions inside what looks like ordinary data and quietly steer the agent. ThornGuard closes that gap. What it does: • Parses every tool response with tree-sitter (AST-level, not regex) to detect…