Plain Plain is a collaborative document editor built for focused writing and team collaboration. It's used by writers, editors, and content teams to create and refine documents together in real-time. Official docs: https://www.plain.com/docs/ Plain Overview - Note - Attachment - Notebook Use action names and parameters as needed. Working with Plain This skill uses the Membrane CLI to interact with Plain. Membrane handles authentication and credentials refresh automatically — so you can focus on the integration logic rather than auth plumbing. Install the CLI Install the Membrane CLI so you ca…