Claude-Code-Workflow/.claude/commands/workflow/ui-design/generate.md

name: generate description: Assemble UI prototypes by combining layout templates with design tokens (pure assembler) argument-hint: [--base-path ] [--session ] [--style-variants ] [--layout-variants ] allowed-tools: TodoWrite(), Read(), Write(), Task(ui-design-agent), Bash()

Generate UI Prototypes (/workflow:ui-design:generate)

Overview

Pure assembler that combines pre-extracted layout templates with design tokens to generate UI prototypes (style × layout × targets). No layout design logic - purely combines existing components.

Strategy: Pure Assembly

• Input: layout-templates.json + design-tokens.json (+ reference images if available)
• Process: Combine structure (DOM) with style (tokens)
• Output: Complete HTML/CSS prototypes
• No Design Logic: All layout and style decisions already made
• Automatic Image Reference: If source images exist in layout templates, they're automatically used for visual context

Prerequisite Commands:

• /workflow:ui-design:style-extract → Complete design systems (design-tokens.json + style-guide.md)
• /workflow:ui-design:layout-extract → Layout structure

Phase 1: Setup & Validation

Step 1: Resolve Base Path & Parse Configuration

# Determine working directory
bash(find .workflow -type d -name "design-*" | head -1)  # Auto-detect

# Get style count
bash(ls {base_path}/style-extraction/style-* -d | wc -l)

# Image reference auto-detected from layout template source_image_path

Step 2: Load Layout Templates

# Check layout templates exist
bash(test -f {base_path}/layout-extraction/layout-templates.json && echo "exists")

# Load layout templates
Read({base_path}/layout-extraction/layout-templates.json)
# Extract: targets, layout_variants count, device_type, template structures

Output: base_path, style_variants, layout_templates[], targets[], device_type

Step 3: Validate Design Tokens

# Check design tokens exist for all styles
bash(test -f {base_path}/style-extraction/style-1/design-tokens.json && echo "valid")

# For each style variant: Load design tokens
Read({base_path}/style-extraction/style-{id}/design-tokens.json)

Output: design_tokens[] for all style variants

Step 4: Load Animation Tokens (Optional)

# Check if animation tokens exist
bash(test -f {base_path}/animation-extraction/animation-tokens.json && echo "exists")

# Load animation tokens if available
IF exists({base_path}/animation-extraction/animation-tokens.json):
    animation_tokens = Read({base_path}/animation-extraction/animation-tokens.json)
    has_animations = true
ELSE:
    has_animations = false

Output: animation_tokens (optional), has_animations flag

Phase 2: Assembly (Agent)

Executor: Task(ui-design-agent) × T × S × L tasks (can be batched)

Step 1: Launch Assembly Tasks

bash(mkdir -p {base_path}/prototypes)

For each target × style_id × layout_id:

Task(ui-design-agent): `
  [LAYOUT_STYLE_ASSEMBLY]
  🎯 Assembly task: {target} × Style-{style_id} × Layout-{layout_id}
  Combine: Pre-extracted layout structure + design tokens → Final HTML/CSS

  TARGET: {target} | STYLE: {style_id} | LAYOUT: {layout_id}
  BASE_PATH: {base_path}

  ## Inputs (READ ONLY - NO DESIGN DECISIONS)
  1. Layout Template:
     Read("{base_path}/layout-extraction/layout-templates.json")
     Find template where: target={target} AND variant_id="layout-{layout_id}"
     Extract: dom_structure, css_layout_rules, device_type, source_image_path

  2. Design Tokens:
     Read("{base_path}/style-extraction/style-{style_id}/design-tokens.json")
     Extract: ALL token values (colors, typography, spacing, borders, shadows, breakpoints)

  3. Animation Tokens (OPTIONAL):
     IF exists("{base_path}/animation-extraction/animation-tokens.json"):
       Read("{base_path}/animation-extraction/animation-tokens.json")
       Extract: duration, easing, transitions, keyframes, interactions
       has_animations = true
     ELSE:
       has_animations = false

  4. Reference Image (AUTO-DETECTED):
     IF template.source_image_path exists:
       Read(template.source_image_path)
       Purpose: Additional visual context for better placeholder content generation
       Note: This is for reference only - layout and style decisions already made
     ELSE:
       Use generic placeholder content

  ## Assembly Process
  1. Build HTML: {base_path}/prototypes/{target}-style-{style_id}-layout-{layout_id}.html
     - Recursively build from template.dom_structure
     - Add: <!DOCTYPE html>, <head>, <meta viewport>
     - CSS link: <link href="{target}-style-{style_id}-layout-{layout_id}.css">
     - Inject placeholder content:
       * Default: Use Lorem ipsum, generic sample data
       * If reference image available: Generate more contextually appropriate placeholders
         (e.g., realistic headings, meaningful text snippets that match the visual context)
     - Preserve all attributes from dom_structure

  2. Build CSS: {base_path}/prototypes/{target}-style-{style_id}-layout-{layout_id}.css
     - Start with template.css_layout_rules
     - Replace ALL var(--*) with actual token values from design-tokens.json
       Example: var(--spacing-4) → 1rem (from tokens.spacing.4)
       Example: var(--breakpoint-md) → 768px (from tokens.breakpoints.md)
     - Add visual styling using design tokens:
       * Colors: tokens.colors.*
       * Typography: tokens.typography.*
       * Shadows: tokens.shadows.*
       * Border radius: tokens.border_radius.*
     - IF has_animations == true: Inject animation tokens
       * Add CSS Custom Properties for animations at :root level:
         --duration-instant, --duration-fast, --duration-normal, etc.
         --easing-linear, --easing-ease-out, etc.
       * Add @keyframes rules from animation_tokens.keyframes
       * Add interaction classes (.button-hover, .card-hover) from animation_tokens.interactions
       * Add utility classes (.transition-color, .transition-transform) from animation_tokens.transitions
       * Include prefers-reduced-motion media query for accessibility
     - Device-optimized for template.device_type

  ## Assembly Rules
  - ✅ Pure assembly: Combine existing structure + existing style
  - ❌ NO layout design decisions (structure pre-defined)
  - ❌ NO style design decisions (tokens pre-defined)
  - ✅ Replace var() with actual values
  - ✅ Add placeholder content only
  - Write files IMMEDIATELY
  - CSS filename MUST match HTML <link href="...">
`

Step 2: Verify Generated Files

# Count expected vs found
bash(ls {base_path}/prototypes/{target}-style-*-layout-*.html | wc -l)

# Validate samples
Read({base_path}/prototypes/{target}-style-{style_id}-layout-{layout_id}.html)
# Check: <!DOCTYPE html>, correct CSS href, sufficient CSS length

Output: S × L × T × 2 files verified

Phase 3: Generate Preview Files

Step 1: Run Preview Generation Script

bash(~/.claude/scripts/ui-generate-preview.sh "{base_path}/prototypes")

Script generates:

• compare.html (interactive matrix)
• index.html (navigation)
• PREVIEW.md (instructions)

Step 2: Verify Preview Files

bash(ls {base_path}/prototypes/compare.html {base_path}/prototypes/index.html {base_path}/prototypes/PREVIEW.md)

Output: 3 preview files

Completion

Todo Update

TodoWrite({todos: [
  {content: "Setup and validation", status: "completed", activeForm: "Loading design systems"},
  {content: "Load layout templates", status: "completed", activeForm: "Reading layout templates"},
  {content: "Assembly (agent)", status: "completed", activeForm: "Assembling prototypes"},
  {content: "Verify files", status: "completed", activeForm: "Validating output"},
  {content: "Generate previews", status: "completed", activeForm: "Creating preview files"}
]});

Output Message

✅ UI prototype assembly complete!

Configuration:
- Style Variants: {style_variants}
- Layout Variants: {layout_variants} (from layout-templates.json)
- Device Type: {device_type}
- Targets: {targets}
- Total Prototypes: {S × L × T}
- Image Reference: Auto-detected (uses source images when available in layout templates)

Assembly Process:
- Pure assembly: Combined pre-extracted layouts + design tokens
- No design decisions: All structure and style pre-defined
- Assembly tasks: T×S×L = {T}×{S}×{L} = {T×S×L} combinations

Quality:
- Structure: From layout-extract (DOM, CSS layout rules)
- Style: From style-extract (design tokens)
- CSS: Token values directly applied (var() replaced)
- Device-optimized: Layouts match device_type from templates

Generated Files:
{base_path}/prototypes/
├── _templates/
│   └── layout-templates.json (input, pre-extracted)
├── {target}-style-{s}-layout-{l}.html ({S×L×T} prototypes)
├── {target}-style-{s}-layout-{l}.css
├── compare.html (interactive matrix)
├── index.html (navigation)
└── PREVIEW.md (instructions)

Preview:
1. Open compare.html (recommended)
2. Open index.html
3. Read PREVIEW.md

Next: /workflow:ui-design:update

Simple Bash Commands

Path Operations

# Find design directory
bash(find .workflow -type d -name "design-*" | head -1)

# Count style variants
bash(ls {base_path}/style-extraction/style-* -d | wc -l)

Validation Commands

# Check layout templates exist
bash(test -f {base_path}/layout-extraction/layout-templates.json && echo "exists")

# Check design tokens exist
bash(test -f {base_path}/style-extraction/style-1/design-tokens.json && echo "valid")

# Count generated files
bash(ls {base_path}/prototypes/{target}-style-*-layout-*.html | wc -l)

# Verify preview
bash(test -f {base_path}/prototypes/compare.html && echo "exists")

File Operations

# Create directories
bash(mkdir -p {base_path}/prototypes)

# Run preview script
bash(~/.claude/scripts/ui-generate-preview.sh "{base_path}/prototypes")

Output Structure

{base_path}/
├── layout-extraction/
│   └── layout-templates.json      # Input (from layout-extract)
├── style-extraction/
│   └── style-{s}/
│       ├── design-tokens.json     # Input (from style-extract)
│       └── style-guide.md
└── prototypes/
    ├── {target}-style-{s}-layout-{l}.html  # Assembled prototypes
    ├── {target}-style-{s}-layout-{l}.css
    ├── compare.html
    ├── index.html
    └── PREVIEW.md

Error Handling

Common Errors

ERROR: Layout templates not found
→ Run /workflow:ui-design:layout-extract first

ERROR: Design tokens not found
→ Run /workflow:ui-design:style-extract first

ERROR: Agent assembly failed
→ Check inputs exist, validate JSON structure

ERROR: Script permission denied
→ chmod +x ~/.claude/scripts/ui-generate-preview.sh

Recovery Strategies

• Partial success: Keep successful assembly combinations
• Invalid template structure: Validate layout-templates.json
• Invalid tokens: Validate design-tokens.json structure

Quality Checklist

• CSS uses direct token values (var() replaced)
• HTML structure matches layout template exactly
• Semantic HTML5 structure preserved
• ARIA attributes from template present
• Device-specific optimizations applied
• All token references resolved
• compare.html works

Key Features

• Pure Assembly: No design decisions, only combination
• Separation of Concerns: Layout (structure) + Style (tokens) kept separate until final assembly
• Token Resolution: var() placeholders replaced with actual values
• Pre-validated: Inputs already validated by extract/consolidate
• Efficient: Simple assembly vs complex generation
• Production-Ready: Semantic, accessible, token-driven

Integration

Prerequisites:

• /workflow:ui-design:style-extract → design-tokens.json + style-guide.md
• /workflow:ui-design:layout-extract → layout-templates.json

Input: layout-templates.json + design-tokens.json Output: S×L×T prototypes for /workflow:ui-design:update Called by: /workflow:ui-design:explore-auto, /workflow:ui-design:imitate-auto