javascript

Work on Mosaic UI: styling a component with slot recipes (`defineSlotRecipe` / `useRecipe` / slots / variants), or building a flow — authoring a state machine (`setup`, states/guards/`invoke`, wiring to React with `useMachine`/`useActor`/ `useSelector`), writing the controller (Clerk adapter) or view (rendering) layer, testing any of those layers, or migrating a legacy / pre-Mosaic component into the machine / controller / view split. Use when building, styling, debugging, testing, or migrating anything Mosaic. `references/mosaic-architecture.md` (repo root) holds the design-system contract; this skill is the how-to layer.

Work effectively in the clerk/javascript SDK monorepo. Use when setting up the repo, building / testing / running a package, deciding which of the @clerk/* packages to change, writing changesets, conventional commits, or PRs, or checking whether a change is a breaking change to clerk-js or ui. Covers the pnpm + turbo dev loop, the package map, and the repo's hard rules. AGENTS.md is the authority on the rules; this skill is the how-to layer that points back to it.