Use when creating or scaffolding a new Fylgja UI component doc (an MDX file under src/content/ui/**), or when writing or reviewing any Fylgja UI example markup, to keep the structure and house style consistent. Covers the content template, ComponentPreview usage, classless HTML, the native-element-first rule, and Fylgja utility idioms (alignment via .align / --align, never invented justify-* or items-* classes).
Use when building a modal or confirmation dialog in a Fylgja project, including requests to "add a modal", "popup", "confirm dialog", "are you sure prompt", or "cookie consent". Ensures a native <dialog> opened with invoker commands, closedby for dismissal control, a form for confirmations, and classless markup, never a div-and-overlay reimplementation.
Use when building an offcanvas, drawer, slide-in panel, side sheet, or mobile nav panel in a Fylgja project. Ensures it is a native <dialog> styled with the small .offcanvas rule on top of Fylgja's base dialog styles, opened via invoker commands, never a bespoke div plus overlay and never redeclaring base defaults.
Reconciles content between this site's library docs (src/content/library/**) and the corresponding package repo's README.md under ~/Developer/fylgja/. Use whenever a package README.md changes and the site docs might be stale, whenever a site library doc changes and the package README might need the same update, or whenever explicitly asked to sync/check doc drift between the site and the package repos.