MCP Hello World Server Simulator

mcp-hello-world is a minimalist Model Context Protocol (MCP) server simulation, primarily designed as a test double or mock server for client-side unit and integration testing. Implemented in TypeScript, it offers a lightweight, predictable, and isolated environment for verifying MCP client logic without relying on real, complex, or potentially slow AI backend services. It currently stands at version 1.1.2 (released April 2025) with a recent cadence of small patches. Key differentiators include its support for both STDIO and HTTP/SSE MCP transport protocols, enabling comprehensive client testing across different connection methods. It provides simple `echo` and `debug` tools for predictable behavior, ensuring fast and reliable test execution. This package is explicitly *not* intended for production deployments or as a general-purpose MCP server.