ui-design-system – Design & UI skill for AI agents

UI Design System

Generate design tokens, create color palettes, calculate typography scales, build component systems, and prepare developer handoff documentation.

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Table of Contents

• [Trigger Terms](#trigger-terms)
• [Workflows](#workflows)
• [Workflow 1: Generate Design Tokens](#workflow-1-generate-design-tokens)
• [Workflow 2: Create Component System](#workflow-2-create-component-system)
• [Workflow 3: Responsive Design](#workflow-3-responsive-design)
• [Workflow 4: Developer Handoff](#workflow-4-developer-handoff)
• [Tool Reference](#tool-reference)
• [Quick Reference Tables](#quick-reference-tables)
• [Knowledge Base](#knowledge-base)

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Trigger Terms

Use this skill when you need to:

• "generate design tokens"
• "create color palette"
• "build typography scale"
• "calculate spacing system"
• "create design system"
• "generate CSS variables"
• "export SCSS tokens"
• "set up component architecture"
• "document component library"
• "calculate responsive breakpoints"
• "prepare developer handoff"
• "convert brand color to palette"
• "check WCAG contrast"
• "build 8pt grid system"

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Workflows

Workflow 1: Generate Design Tokens

Situation: You have a brand color and need a complete design token system.

Steps:

1. Identify brand color and style

• Brand primary color (hex format)
• Style preference: modern | classic | playful

2. Generate tokens using script

   python scripts/design_token_generator.py "#0066CC" modern json
   

3. Review generated categories

• Colors: primary, secondary, neutral, semantic, surface
• Typography: fontFamily, fontSize, fontWeight, lineHeight
• Spacing: 8pt grid-based scale (0-64)
• Borders: radius, width
• Shadows: none through 2xl
• Animation: duration, easing
• Breakpoints: xs through 2xl

4. Export in target format

   # CSS custom properties
   python scripts/design_token_generator.py "#0066CC" modern css > design-tokens.css

   # SCSS variables
   python scripts/design_token_generator.py "#0066CC" modern scss > _design-tokens.scss

   # JSON for Figma/tooling
   python scripts/design_token_generator.py "#0066CC" modern json > design-tokens.json
   

5. Validate accessibility

• Check color contrast meets WCAG AA (4.5:1 normal, 3:1 large text)
• Verify semantic colors have contrast colors defined

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Workflow 2: Create Component System

Situation: You need to structure a component library using design tokens.

Steps:

1. Define component hierarchy

• Atoms: Button, Input, Icon, Label, Badge
• Molecules: FormField, SearchBar, Card, ListItem
• Organisms: Header, Footer, DataTable, Modal
• Templates: DashboardLayout, AuthLayout

2. Map tokens to components

| Component | Tokens Used |

|-----------|-------------|

| Button | colors, sizing, borders, shadows, typography |

| Input | colors, sizing, borders, spacing |

| Card | colors, borders, shadows, spacing |

| Modal | colors, shadows, spacing, z-index, animation |

3. Define variant patterns

Size variants:

   sm: height 32px, paddingX 12px, fontSize 14px
   md: height 40px, paddingX 16px, fontSize 16px
   lg: height 48px, paddingX 20px, fontSize 18px
   

Color variants:

   primary: background primary-500, text white
   secondary: background neutral-100, text neutral-900
   ghost: background transparent, text neutral-700
   

4. Document component API

• Props interface with types
• Variant options
• State handling (hover, active, focus, disabled)
• Accessibility requirements

5. Reference: See references/component-architecture.md

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Workflow 3: Responsive Design

Situation: You need breakpoints, fluid typography, or responsive spacing.

Steps:

1. Define breakpoints

| Name | Width | Target |

|------|-------|--------|

| xs | 0 | Small phones |

| sm | 480px | Large phones |

| md | 640px | Tablets |

| lg | 768px | Small laptops |

| xl | 1024px | Desktops |

| 2xl | 1280px | Large screens |

2. Calculate fluid typography

Formula: clamp(min, preferred, max)

   /* 16px to 24px between 320px and 1200px viewport */
   font-size: clamp(1rem, 0.5rem + 2vw, 1.5rem);
   

Pre-calculated scales:

   --fluid-h1: clamp(2rem, 1rem + 3.6vw, 4rem);
   --fluid-h2: clamp(1.75rem, 1rem + 2.3vw, 3rem);
   --fluid-h3: clamp(1.5rem, 1rem + 1.4vw, 2.25rem);
   --fluid-body: clamp(1rem, 0.95rem + 0.2vw, 1.125rem);
   

3. Set up responsive spacing

| Token | Mobile | Tablet | Desktop |

|-------|--------|--------|---------|

| --space-md | 12px | 16px | 16px |

| --space-lg | 16px | 24px | 32px |

| --space-xl | 24px | 32px | 48px |

| --space-section | 48px | 80px | 120px |

4. Reference: See references/responsive-calculations.md

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Workflow 4: Developer Handoff

Situation: You need to hand off design tokens to development team.

Steps:

1. Export tokens in required formats

   # For CSS projects
   python scripts/design_token_generator.py "#0066CC" modern css

   # For SCSS projects
   python scripts/design_token_generator.py "#0066CC" modern scss

   # For JavaScript/TypeScript
   python scripts/design_token_generator.py "#0066CC" modern json
   

2. Prepare framework integration

React + CSS Variables:

   import './design-tokens.css';

   <button className="btn btn-primary">Click</button>
   

Tailwind Config:

   const tokens = require('./design-tokens.json');

   module.exports = {
     theme: {
       colors: tokens.colors,
       fontFamily: tokens.typography.fontFamily
     }
   };
   

styled-components:

   import tokens from './design-tokens.json';

   const Button = styled.button`
     background: ${tokens.colors.primary['500']};
     padding: ${tokens.spacing['2']} ${tokens.spacing['4']};
   `;
   

3. Sync with Figma

• Install Tokens Studio plugin
• Import design-tokens.json
• Tokens sync automatically with Figma styles

4. Handoff checklist

• [ ] Token files added to project
• [ ] Build pipeline configured
• [ ] Theme/CSS variables imported
• [ ] Component library aligned
• [ ] Documentation generated

5. Reference: See references/developer-handoff.md

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Tool Reference

design_token_generator.py

Generates complete design token system from brand color.

| Argument | Values | Default | Description |

|----------|--------|---------|-------------|

| brand_color | Hex color | #0066CC | Primary brand color |

| style | modern, classic, playful | modern | Design style preset |

| format | json, css, scss, summary | json | Output format |

Examples:

# Generate JSON tokens (default)
python scripts/design_token_generator.py "#0066CC"

# Classic style with CSS output
python scripts/design_token_generator.py "#8B4513" classic css

# Playful style summary view
python scripts/design_token_generator.py "#FF6B6B" playful summary

Output Categories:

| Category | Description | Key Values |

|----------|-------------|------------|

| colors | Color palettes | primary, secondary, neutral, semantic, surface |

| typography | Font system | fontFamily, fontSize, fontWeight, lineHeight |

| spacing | 8pt grid | 0-64 scale, semantic (xs-3xl) |

| sizing | Component sizes | container, button, input, icon |

| borders | Border values | radius (per style), width |

| shadows | Shadow styles | none through 2xl, inner |

| animation | Motion tokens | duration, easing, keyframes |

| breakpoints | Responsive | xs, sm, md, lg, xl, 2xl |

| z-index | Layer system | base through notification |

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Quick Reference Tables

Color Scale Generation

| Step | Brightness | Saturation | Use Case |

|------|------------|------------|----------|

| 50 | 95% fixed | 30% | Subtle backgrounds |

| 100 | 95% fixed | 38% | Light backgrounds |

| 200 | 95% fixed | 46% | Hover states |

| 300 | 95% fixed | 54% | Borders |

| 400 | 95% fixed | 62% | Disabled states |

| 500 | Original | 70% | Base/default color |

| 600 | Original × 0.8 | 78% | Hover (dark) |

| 700 | Original × 0.6 | 86% | Active states |

| 800 | Original × 0.4 | 94% | Text |

| 900 | Original × 0.2 | 100% | Headings |

Typography Scale (1.25x Ratio)

| Size | Value | Calculation |

|------|-------|-------------|

| xs | 10px | 16 ÷ 1.25² |

| sm | 13px | 16 ÷ 1.25¹ |

| base | 16px | Base |

| lg | 20px | 16 × 1.25¹ |

| xl | 25px | 16 × 1.25² |

| 2xl | 31px | 16 × 1.25³ |

| 3xl | 39px | 16 × 1.25⁴ |

| 4xl | 49px | 16 × 1.25⁵ |

| 5xl | 61px | 16 × 1.25⁶ |

WCAG Contrast Requirements

| Level | Normal Text | Large Text |

|-------|-------------|------------|

| AA | 4.5:1 | 3:1 |

| AAA | 7:1 | 4.5:1 |

Large text: ≥18pt regular or ≥14pt bold

Style Presets

| Aspect | Modern | Classic | Playful |

|--------|--------|---------|---------|

| Font

… (full content is in the download package)