Two design skills · both proven

frontend-design vs web-design-guidelines

Both skills were run through Claude twice: once on a fixed brief without the skill, once with it. The briefs differ because each is written for the job the skill claims to do, so compare each skill against its own baseline, then decide which difference matters for your work.

frontend-design

Guidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with aesthetic direction, typography, and making choices that don't read as templated defaults.

Category: Design
Source: anthropics/skills · 181,998 stars
License: Not stated
Proof model: claude-opus-5-5
Brief: “Build the marketing landing page for Halcyon, a calm AI calendar app for busy founders. Include a hero with a product mockup of the app, a short row of customer logos, three feature sections that each show the product, a customer quote, a pricing teaser, and a footer. Draw any illustrations or product shots with inline SVG and CSS.”
Skill commit: dbd4588

web-design-guidelines

Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".

Category: Design
Source: vercel-labs/agent-skills · 32,607 stars
License: Not stated
Proof model: claude-sonnet-5-5
Brief: “Build a sign-up form for a newsletter with name, email, a topics checklist, and clear error and success states.”
Skill commit: 063bee9

We don’t pick a winner for you: the pages are the evidence. Both proofs can be repeated with the brief, model and commit shown above. See alternatives to frontend-design or alternatives to web-design-guidelines.