Teach a desktop agent by doing a task once. Understudy learns the workflow, turns it into a reusable skill, and can later execute it for a new input across GUI apps, browsers, shell tools, files, and messaging. It’s open source, local-first, and designed for real cross-app work instead of brittle macro playback. Current state: macOS today, MIT licensed, with teach-by-demonstration working and route optimization still early.