# Mixlar SDK > Build plugins and device widgets for the Mixlar M1X control surface. Covers the MixlarPlugin API, the mixlar-sdk CLI, the widget spec and serial protocol, packaging/signing, and the headless device emulator. Install with: pip install mixlar-sdk These docs are for developers building Mixlar plugins in Python with the mixlar-sdk package (PyPI: mixlar-sdk). A plugin is a folder with a plugin.json manifest and a MixlarPlugin subclass; it can ship device widgets (mixw JSON specs) that render on the M1X screen. Use the CLI to scaffold (create), validate, emulate without hardware, and package/sign. ## Documentation Sets - [Abridged documentation](https://docs.mixlar.net/llms-small.txt): a compact version of the documentation for Mixlar SDK, with non-essential content removed - [Complete documentation](https://docs.mixlar.net/llms-full.txt): the full documentation for Mixlar SDK ## Notes - The complete documentation includes all content from the official documentation - The content is automatically generated from the same source as the official documentation