DesignScan MCP server

DesignScan

URL → design tokens → DESIGN.md. Point it at any website and get a spec-compliant DESIGN.md file (YAML tokens + prose) that AI coding agents can read to match that site's look.

Preview

Every run can also emit a self-contained HTML proof sheet (--preview) that renders the extracted tokens — color roles, type specimens, spacing/radius scales, components — so you can eyeball the result before trusting it:

Notes for your coding agent

A DESIGN.md is always consumed by an AI coding agent (Cursor, Claude Code, …). So rather than run our own LLM to resolve semantic intent, every file ends with a Notes for your coding agent section: deterministic, per-extraction instructions computed from the actual tokens — heading hierarchy vs. a muted text color, sub-AA body contrast, brand-font fallback, the primary-button contract, shape/spacing rhythm. The reasoning stays on our side (no API key); the application happens for free inside the agent you already use.

It measurably changes the output. Below: the same stripe.DESIGN.md cloned by an agent that ignored the notes (left) vs one that followed them (right) — identical tokens, layout, and copy:

Brand corpus

A growing, curated library of real-brand specs lives in examples/ — each one a DESIGN.md, an HTML preview, and the raw token JSON, indexed in examples/README.md (visual gallery: index.html).

Rebuild it from the committed JSON with pnpm seed rebuild (no network), or add brands with pnpm seed add — degenerate / bot-challenged pages are skipped automatically so the corpus only holds trustworthy specs.

Monorepo layout

Install (as a CLI / library)

The engine ships as the publishable @designscan/extractor package — a designscan CLI and a typed library — with designscan as its short npx alias.

# one-off, no install
npx designscan stripe.com --md --out stripe.DESIGN.md

# or install the CLI
npm i -g @designscan/extractor
npx playwright install chromium   # one-time (the engine drives headless Chromium)
designscan stripe.com --md --preview --out stripe.DESIGN.md

Quick start (from this repo)

This is a pnpm workspace (corepack enable to get pnpm).

pnpm install
pnpm --filter @designscan/extractor exec playwright install chromium  # one-time

# token profile (JSON) for any URL
pnpm extract stripe.com

# generate a DESIGN.md (light theme by default)
pnpm extract stripe.com --md --out out/stripe.DESIGN.md

# pick a theme: light (default) | dark | both
pnpm extract vercel.com --md --theme dark --out out/vercel.dark.DESIGN.md

# both = bundle light + dark into one file (parallel *-dark tokens)
pnpm extract vercel.com --md --theme both --out out/vercel.DESIGN.md

# --preview = also write a self-contained HTML proof sheet beside the file,
# rendering every token (swatches, type specimens, scales, components) so you
# can eyeball the extraction before trusting it (--theme both adds a Light/Dark toggle)
pnpm extract stripe.com --md --preview --out out/stripe.DESIGN.md
# → out/stripe.DESIGN.md  +  out/stripe.preview.html

Shortened. The full README is on GitHub.