design-tokens — single source, every platform

Goal: one DTCG-format JSON, four platform outputs. No drift.

What This Skill Can Do

• Generate and audit W3C DTCG token bundles for color, typography, spacing, radius, motion, shadow/elevation, and semantic state roles.
• Translate one source token JSON to Tailwind, CSS variables, Compose, SwiftUI, and WinUI using ../../scripts/token_export.py.
• Catch token drift, raw/semantic naming mistakes, unsupported platform values, circular references, and single-platform-only token systems.
• Advise when tokens are wrong for the job, such as bespoke campaign pages that need art direction more than a reusable system.

Step 1 — Source format: W3C DTCG

Every token bundle this skill produces or consumes is in W3C Design Tokens Community Group format. Keys:

• $value — the literal value
• $type — color | dimension | fontFamily | fontWeight | duration | shadow | typography
• $description — human-readable rationale (kept in the token; not a comment)

Example:

{
  "color": {
    "brand": {
      "primary": { "$value": "#3b1c0f", "$type": "color", "$description": "Hero accent — used like a weapon" },
      "primary-hover": { "$value": "{color.brand.primary}", "$type": "color" }
    }
  },
  "spacing": {
    "xs": { "$value": "4px", "$type": "dimension" },
    "sm": { "$value": "8px", "$type": "dimension" }
  },
  "type": {
    "display": {
      "$value": { "fontFamily": "PP Editorial New", "fontSize": "72px", "fontWeight": 400, "lineHeight": 1.05 },
      "$type": "typography"
    }
  }
}

Step 2 — Platform translation matrix

Platform	Output target
Web (Tailwind v4)	@theme { --color-brand-primary: ...; } block
Web (CSS)	:root { --color-brand-primary: ...; }
Apple (SwiftUI)	extension Color { static let brandPrimary = ... } + Color asset catalog JSON
Android (Compose)	ColorScheme(primary = Color(0xFF...), ...) + Typography
Windows (WinUI 3)	<ResourceDictionary> with <Color>, <SolidColorBrush>, <x:Double>

Use ../../scripts/token_export.py for the translation — never hand-translate. Tokens drift fast.

Step 3 — When you should NOT generate tokens

Three cases where token work is wrong:

1. The user wants ONE platform — let that platform skill use its native idiom directly. Tokens are for reuse.
2. The brief is "Awwwards-tier landing page" — tokens flatten the bespoke choices that make it distinctive.
3. The team has no system to maintain. Tokens without governance become stale faster than they help.

State this explicitly if the user asks to "tokenize everything." Push back once.

Step 4 — Auditing existing tokens

When asked to audit a token set:

1. Coverage check — does it cover the 5 layers? color (semantic + raw), spacing, typography, motion, elevation/material.
2. Semantic vs raw discipline — are there "primary-button-bg" tokens (semantic) AND "blue-500" tokens (raw)? Both layers, no shortcuts.
3. Reference resolution — semantic tokens must reference raw, never the inverse.
4. Dark mode parity — every semantic color has a dark variant.
5. Platform-specific bans — flag any token that won't survive translation (e.g. CSS box-shadow for native, where elevation is tonal).

Step 5 — Anti-slop ban list (token-specific)

• Hex colors with no semantic name (#3b82f6 exposed as a token name)
• 100+ raw colors with no semantic layer
• Spacing scales that aren't 4-based on Windows/Android, 8-based on Apple, fluid on web
• One token bundle declared "the source of truth" but only generated for web (the most common failure)
• Tailwind classes baked into tokens (defeats translation)
• Skipping $type (some tools won't validate without it)

Step 6 — Reference token bundles

Shipped in ../../assets/tokens/:

• fluent-2.json — Microsoft Fluent 2 reference
• material3-expressive.json — M3E reference (M3E adds wave/morph tokens vs M3)
• apple-system.json — iOS/macOS semantic system colors
• awwwards-editorial.json — bespoke "editorial Swiss" example
• awwwards-brutalist.json — bespoke "tactile brutalist" example