mcp-cli is a command-line interface (CLI) checker for the Model Context Protocol (MCP). It allows users to run MCP servers, list tools, resources, and prompts, and invoke tools, read resources, and access prompts. This tool is crucial for developers as it simplifies the development and interaction processes with MCP servers, enabling more efficient management and debugging. mcp-cli is written in JavaScript, fully open-source, and its source code can be found on GitHub.