The Pass-through Proxy is the foundational middleware layer that sits between AI assistants and MCP tools. It intercepts all communication, processes it through a configurable chain of hooks, and enables you to add custom logic without modifying the underlying MCP servers. This architecture powers our Guardrail Proxy and enables endless customization possibilities.Think of it as a smart router that can inspect, modify, filter, or enrich every request and response flowing between your AI and its tools.
This flask is currently distilling: The core proxy infrastructure is stable and powers our Guardrail system. We’re developing additional hook templates and improving the developer experience for creating custom hooks. The system handles thousands of requests in production environments. Contact us if you need help building custom middleware for your MCP tools.