This synthesis records claims and practices from the cited sources; reported outcomes and product capabilities have not been independently verified.
Design with Claude operates through skills (Impeccable, Emil Kowalski, Interface Design), agent canvases (Paper with code-native HTML/CSS, Pencil with 6-agent swarm mode), and inspiration tools (Variant Style Dropper, Mobbin). Claude Design (Anthropic Labs, Opus 4.7 vision) generates prototypes, slides, and one-pagers conversationally. The markdown design-spec pattern consolidates: Google's Design.md captures typography, colors, spacing; extract existing brands' (Linear, Stripe, Vercel) design language, reference it across modular skills for unified touchpoints. Refero's 2,000 DESIGN.md files fix agent-generated UI ugliness—agents lacked exposure to good design. Multimodal input (video of target UI) outperforms text prompts by capturing interaction patterns. Skills controlling output format represent a new agent-customization category. AI design agents readily over-add elements without questioning constraints, and prototype gravity creates inertia toward refinement rather than exploration; iterate in dedicated design tools generating variants first. Google's Design.md format applied across landing pages, apps, pitch decks, and videos creates unified brand experience.