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name: design-frontend description: > Create a new production-grade UI from scratch, not a polish pass. Use when "build this UI", "design this page", or "new dashboard layout". Polish → enhance-web-ui. Landing → enhance-web-landing. Redesign → enhance-web-redesign. license: MIT

Frontend Design Skill

Degree of freedom: MIXED. Visual composition [HIGH freedom]; design-system discovery [LOW freedom — run exactly].

Discover design systems, respect existing patterns, create beautiful interfaces.

How to reason

1. Discover — tokens, components/ui, forbidden patterns
2. Reuse — extend existing components; do not fork a second Button
3. Compose — new surface on those tokens
4. Check — type mins, 44px targets, reduced-motion, none of the named defaults in the Anti-Generic list

Worked example

Discover: components/ui/button.tsx + globals.css tokens; text-xs min; rounded-sm. Reuse: settings rows use existing Button / Input; no new primitive. Compose: new /settings page — token spacing, text-sm body, 44px save. Check: Anti-Generic list clear (no Inter, purple-on-white, or pill buttons); prefers-reduced-motion on any spinner.

Self-critique before reporting

• Discovery stated — token file, radius, and forbidden list were spoken before JSX
• Reuse first — no duplicate primitive next to components/ui
• Mins held — readable type ≥ text-xs; tap targets ≥44px
• Right owner — polish existing → enhance-web-ui; landing → enhance-web-landing; redesign existing → enhance-web-redesign

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Phase 1: Design System Discovery [LOW freedom — run exactly]

Before writing ANY frontend code:

1.1 Find Design System Files

Glob: **/*design-system*.{md,ts,css}
Glob: **/tokens*.{ts,json}
Glob: **/components/ui/**
Glob: **/_*README*

1.2 Extract & Document Tokens

Category	Find	Examples
Typography	Sizes, weights	text-xs, font-medium
Spacing	Padding, gaps	p-4, gap-2
Colors	Palette, semantic	bg-emerald-50
Borders	Radius, styles	rounded-sm
Animations	Durations	duration-200

1.3 Find Forbidden Patterns

grep -r "NEVER\|FORBIDDEN\|❌" docs/ README*

1.4 Verification Statement (REQUIRED)

"Design System Discovery:
├─ Found: [design system path]
├─ Typography min: [e.g., text-xs]
├─ Radius standard: [e.g., rounded-sm]
├─ Forbidden: [list patterns]
└─ Reusing: [existing components]"

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Phase 2: Implementation Standards [HIGH freedom]

Typography Minimums

Context	Minimum	Usage
Body	text-sm (14px)	Primary content
Captions	text-xs (12px)	Labels, hints
Compact	text-[10px]	Dense dashboards only

Never use text-[8px] or text-[9px] for readable content.

Accessibility Requirements

Check	Requirement
Touch targets	≥44×44px
Contrast	4.5:1 text, 3:1 UI
Keyboard	tabIndex, focus styles
Motion	prefers-reduced-motion

Quick Reference

Typography: text-xs=12px, text-sm=14px, text-base=16px
Spacing: 1=4px, 2=8px, 3=12px, 4=16px, 6=24px, 8=32px

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Phase 3: Quality Checklist [LOW freedom — do not skip]

[ ] Uses design system tokens (no hardcoded values)
[ ] Extends existing components (no duplicates)
[ ] Typography ≥ text-xs for readable content
[ ] Touch targets ≥ 44px
[ ] Focus states visible
[ ] prefers-reduced-motion respected

Common Fixes

Issue	Fix
Tiny text	text-[9px] → text-xs
Bold weights	font-bold → font-medium
Large radius	rounded-lg → rounded-sm
Spin animation	animate-spin → animate-pulse

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Anti-Generic Checklist

Undirected drafts land on the same few defaults; the check is concrete only when they are named:

• Inter / Roboto / Arial as the display or body face
• Purple (violet/indigo) gradient on white
• Cream / off-white page background
• Italic accent words inside headlines
• "01 / 02 / 03" numbered section labels
• Monospace eyebrow labels on a non-code product
• Pill-shaped (fully rounded) buttons as the house button
• Three equal cards in a row as the default section layout

Extend this list with whatever the first draft used instead.

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Remember: The codebase's design system is the source of truth. Search before creating. Reuse before reinventing.