Tools

Design engineering skills by Emil Kowalski, author of Sonner and Vaul: choose animation easing and durations, review and improve motion, apply Apple design principles, make web apps feel native on phones, and help pick UI libraries and prototype multiple versions.

Reviews UI code against Vercel's Web Interface Guidelines, covering accessibility, focus, forms, animation, typography, dark mode and more, listing issues as file:line. Fetches the latest rules before each review. Maintained by Vercel.

Design engineer Jakub Krehel's 11 UI skills: targeted fixes for typography, color, layout, accessibility and UI copy, plus full interface reviews, animation teardowns, component state stress tests and multi-variant generation. Works on web project code; installing needs Node.js.

Polishes existing motion against the transitions.dev token scale for duration, distance, scale, blur and easing, matching each value by what the motion does rather than the nearest number, with rules for open/close asymmetry, hover in and out, stagger and intent delays.

Design engineer Jakub Krehel's UI polish skill covering animation, typography, icons, hover states, optical alignment, concentric radii, shadows and hit areas, with quick and full review modes, so agents get the details right when building or reviewing UI. Works on web code; needs Node.js.

Companion skill to the User Interface Wiki: 152 rules in 12 categories, from motion, easing and exit animations to UI sounds, interaction laws, prefetching and typography, for writing or reviewing web UI code, with issues listed by file:line. Needs an existing web project and Node.js to install.

Miro's official plugin with the Miro remote MCP and three skills: draw codebase explanations on a board, run visual code reviews on the board, and turn board docs, diagrams and prototypes into development specs. Needs OAuth with a Miro account.

Audits animation code against Disney's 12 principles adapted for the web, checking timing, easing, physics and staging rules such as user-initiated motion under 300ms and ease-out entrances, and reports findings as file:line.

Audits Web Audio API code for procedural UI sound synthesis: reusing one AudioContext, resuming when suspended, disconnecting nodes, exponential decay envelopes, noise for clicks and parameter choices, with findings reported as file:line.

Audits UI code for audio feedback: every sound needs a visual equivalent, an off switch and volume control, and should respect reduced motion. Sound is for confirmations and errors, not typing or decorative hovers. Also checks preloading, default volume and sound weight. Reports file:line findings.

Audits animation code for the right timing function: springs for gestures and interruptible motion, easing for system-driven state changes, linear for progress, and no animation for high-frequency interactions. Also checks spring parameters and durations. Reports file:line findings.