This guide demonstrates how to load test hosted MCP servers using a reusable Python and Locust harness that faithfully models the MCP lifecycle, including initialization, tool discovery, tool calls, authentication, and session cleanup. The framework supports stateful and stateless MCP servers, multiple authentication patterns, and seamless execution both locally and in Azure Load Testing, enabling teams to measure latency, concurrency behavior, and failure characteristics of production MCP endpoints under realistic AI agent workloads.