APIMatic CLI is a command line tool that serves as a wrapper over the Python SDK of APIMatic, allowing users to generate SDKs or transform API descriptions with ease. It supports various authentication methods and features such as SDK generation, API validation, and API transformation. The tool can be installed using pip or by downloading a small executable file, and its usage is straightforward, requiring only a command to be typed on the CLI. Users can provide an API description in multiple ways, including from APIMatic integration keys, URLs, or uploaded files. The APIMatic CLI allows for customization of commands with various options, making it a convenient tool for developers who prefer using command line interfaces.