Describe a workout → a playable card. The model fills a schema; your components render it. Shipped, open-source, yours today.
The generative-UI pattern every serious AI app uses: the model never writes interface code — it fills a schema your trusted components render. Forge is that pattern as a complete working app (MIT).
Read the full field guide — every scar, runnable code→24 interactive classes on shipping real tools with Claude Code and a terminal — the same process that built this shelf, not a drag-and-drop toy track.
Every class ends with a working artifact you keep. The proof it works? You're looking at it — this whole shelf was built that way.
See the 24 classes