UX UI Mastery is a large-scale plugin that ships 19 distinct skills, 55 reference documents, and 10 slash commands focused on design system work. It is built for teams that maintain component libraries and need Claude Code to understand the rules governing their system.
What makes it different
Most design skills teach Claude about general UX principles. This one goes deeper into the mechanical side of design systems. It understands type scales, spacing tokens, colour ramps with perceptual uniformity, component API contracts, and the relationship between design tokens and their CSS custom property outputs.
When you ask Claude to add a new component to your library, it will follow your existing naming conventions, use your token vocabulary, and generate variants that are consistent with the rest of the system. It does not invent new patterns when existing ones apply.
WCAG coverage
The plugin includes full WCAG 2.2 coverage along with an early preview of WCAG 3.0 criteria. This is useful for teams that want to stay ahead of evolving standards. The accessibility skills check contrast ratios against both the current and draft algorithms, flag target size issues, and verify focus management in complex widgets.
Scope and tradeoffs
This is a large plugin. The 55 reference documents add meaningful context to Claude’s responses but also consume token budget. Teams working on small projects may prefer a lighter skill. Teams maintaining production design systems with strict governance will find the depth worthwhile.