This is Anthropic's official frontend design skill, adapted for Open Design. It's what you use when you want Claude to build actual production interfaces, not generic SaaS templates with purple gradients and blob decorations. The workflow pushes you to pick a specific aesthetic direction first, then build working HTML/CSS/JS or framework code with real interaction states, honest content, and accessible markup. It enforces visual craft through typography, color, and layout rules, and integrates with Open Design's brand system when present. The self review checklist is particularly good: it catches responsive breakage, missing focus states, and AI slop patterns before you ship.
npx skills add https://github.com/nexu-io/open-design --skill frontend-design