Frontend Design is Anthropic’s Skill for shaping new interfaces or reworking an existing visual direction. It asks an agent to ground design choices in the subject, audience, and purpose of a brief, then make a coherent plan before implementation. The guidance connects typography, color, spacing, motion, and content to that direction, with attention to responsive behavior and accessibility. It is useful for a landing page, dashboard, or product screen that needs an identifiable visual approach. Provide real content and any existing design constraints so the agent can develop the interface and critique its rendered result. The Skill supplies design instructions rather than a separate website builder.