Create Design System

Generate a complete, opinionated DESIGN.md from a short description.

Input

The user provides a short description of the desired aesthetic direction. Examples:

• "dark editorial for a privacy-focused developer tool"
• "warm minimal for a recipe app"
• "brutalist for a crypto exchange"

If no description is provided, ask for one:

question: "Describe the design direction in a few words"
options:
  - label: "Dark editorial"
    description: "Moody, magazine-inspired, serif-forward"
  - label: "Clean minimal"
    description: "Extreme reduction, one accent color, invisible UI"
  - label: "Bold brutalist"
    description: "Hard edges, high contrast, raw structure"
  - label: "Warm organic"
    description: "Natural textures, warm palette, flowing forms"

Generation Flow

Step 1: Load References

Read these files before generating anything:

• ${CLAUDE_SKILL_DIR}/references/anti-slop.md — patterns to avoid
• ${CLAUDE_SKILL_DIR}/references/aesthetic-seeds.md — non-default starting directions
• ${CLAUDE_SKILL_DIR}/references/design-md-schema.md — strict output schema

Step 2: Select Aesthetic Seed

Based on the user's description, select the most appropriate seed from aesthetic-seeds.md. The seed provides:

• Font pairing candidates (display + body + mono)
• Color derivation strategy
• Spatial philosophy
• Elevation approach
• Natural prohibitions

The seed is a starting direction, not a template. Adapt and build on it based on the user's specific needs. Combine elements from multiple seeds if the description warrants it.

Step 3: Generate DESIGN.md

Follow the strict schema from design-md-schema.md exactly. Generate all 7 sections with all required subsections.

Anti-Slop Enforcement — CRITICAL:

For EVERY design decision, cross-check against anti-slop.md. This is not optional. The following checks are mandatory:

Section	Anti-Slop Checks
Typography	No Inter, Roboto, Open Sans, Lato, Arial as primary. Weight contrast must be extreme (not 400 vs 600). Size jumps 3x+ between levels.
Colors	No purple/indigo gradient defaults. No pure #000000 or #ffffff. Palette has one dominant + sharp accent, not evenly distributed. No cyan-on-dark neon default.
Layout	Prohibitions must ban at least one layout anti-pattern. No uniform spacing throughout.
Shadows	No box-shadow: 0 4px 6px rgba(0,0,0,0.1). All shadows hue-tinted or otherwise distinctive.
Components	No border-radius: 8-12px + generic shadow combo. No left-border accent on all cards. Button hierarchy (primary/secondary/tertiary) must be visually distinct.
Do's/Don'ts	Must include relevant AI Slop checklist items as Don'ts.

If a generated value matches a flagged anti-slop pattern, choose an alternative. Do not proceed with slop values.

Step 4: Auto-Detect Placement

Scan the project to determine where DESIGN.md should live:

1. Look for framework indicators:
   • src/components/, src/app/, src/pages/ → project root
   • app/ (Next.js app router) → project root
   • packages/ui/, packages/web/, packages/frontend/ → that package root
2. In a monorepo, find the topmost directory containing all UI packages
3. Fall back to project root
4. Present the proposed path to the user, allow override

Use Glob to scan: **/src/components, **/src/app, **/packages/*/src, **/app, **/pages.

Step 5: Write DESIGN.md

Write the generated content to the detected/chosen path.

Step 6: Update CLAUDE.md

At the same directory level as DESIGN.md, add to (or create) a CLAUDE.md:

## Design System
Read and follow DESIGN.md for all UI work.
Never violate the Core Prohibitions defined in DESIGN.md.
Check the Anti-Moodboard before proposing any visual direction.

If a CLAUDE.md already exists, append this block. If it doesn't exist, create it with this content.

Step 7: Report

Tell the user:

• Where DESIGN.md was written
• The Creative North Star name
• How many Core Prohibitions were defined
• That CLAUDE.md was updated
• Suggest running /design-systems:specimen to preview the system

Post-Generation Validation

After writing, run the validation checklist from design-md-schema.md:

• Verify all 7 sections present
• Verify no banned fonts in type scale
• Verify no anti-slop patterns in palette
• Verify Core Prohibitions are mechanically checkable
• Verify Anti-Moodboard has at least 2 rejections

If any check fails, fix the issue before presenting to the user.