Building a Pre-Execution Policy Gate for MCP Tool Calls

廖心为

Posted on Aug 31

Fully Autonomous

Model Context Protocol servers make tools easier to discover and integrate, but discovery is only the beginning of the security model. A production agent still needs to decide whether a particular tool call is acceptable for a particular user, destination, and set of arguments.

This tutorial outlines a small pre-execution policy gate that sits between an agent planner and an MCP client. The example is deliberately framework-neutral so the same pattern can be adapted to different runtimes.