prefab

Build interactive UIs with the Prefab component library. Covers PrefabApp, layout (Grid, Row, Card), actions, expressions, and all component imports. Use when building Prefab UI apps, MCP apps with Prefab, FastMCP apps, or generative UIs.

How to build and preview renderer/playground changes locally. Use this skill when modifying the renderer (themes, components, styles), the playground (theme picker, examples), or any Python source that needs to appear in the playground. Covers the build pipeline, common pitfalls, and how to iterate.