Agent skill · design visual · sundial-org
ui-skills
Opinionated constraints for building better interfaces with agents.
Why this skill is useful
Provides specific design constraints and best practices for UI development that the AI wouldn't reliably generate on its own.
What it needs
About 2k tokens when loaded. Last updated 2026-03-07. 639 stars on the source repository.
What this skill does
UI Skills Opinionated constraints for building better interfaces with agents. Stack MUST use Tailwind CSS defaults (spacing, radius, shadows) before custom values MUST use motion/react (formerly framer-motion) when JavaScript animation is required SHOULD use tw-animate-css for entrance and micro-animations in Tailwind CSS MUST use cn utility (clsx + tailwind-merge) for class logic Components MUST use accessible component primitives for anything with keyboard or focus behavior (Base UI, React Aria, Radix) MUST use the project’s existing component primitives first NEVER mix primitive systems within the same interaction surface SHOULD prefer Base UI for new primitives if compatible with the stack MUST add an aria-label to icon-only buttons NEVER rebuild keyboard or focus behavior by hand unless explicitly requested Interaction MUST use an AlertDialog for destructive or irreversible actions SHOULD use structural skeletons for loading states NEVER use h-screen, use h-dvh MUST respect safe-area-inset for fixed elements MUST show errors next to where the action happens NEVER block paste in input or textarea elements Animation NEVER add animation unless it is explicitly requested MUST animate only compositor props (transform, opacity) NEVER animate layout properties (width, height, top, left, margin, padding) SHOULD avoid animating paint properties (background, color) except for small, local UI (text, icons) SHOULD use ease-out on entrance NEVER exceed 200ms for interaction feedback MUST pause looping animations when off-screen MUST respect prefers-reduced-motion NEVER introduce custom easing curves unless explicitly requested SHOULD avoid animating large images or full-screen surfaces Typography MUST use text-balance for headings and text-pretty for body/paragraphs MUST use tabular-nums for data SHOULD use truncate or line-clamp for dense UI NEVER modify letter-spacing (tracking-) unless explicitly requested Layout MUST use a fixed z-index scale (no arbitrary z-x) SHOULD u …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sundial-org/ui-skills