extract-design

Extract Design — Dembrandt

Dembrandt runs a headless Chromium browser against any URL, walks up to thousands of DOM elements, reads computed CSS, and returns a structured design system: colors with confidence scoring, typography styles, spacing scale, border radius, borders, shadows, and interactive component styles.

How to Run

# Zero-install — npx fetches the package on first run (lowest friction)
npx -y dembrandt https://dembrandt.com

# Or install once (global), then call `dembrandt` directly
npm i -g dembrandt

# Basic extraction — outputs to terminal
dembrandt https://dembrandt.com

# JSON output — pipe into files or other tools
dembrandt https://dembrandt.com --json-only > dembrandt-tokens.json

# W3C DTCG format (design-tokens.org standard)
dembrandt https://dembrandt.com --dtcg --save-output

# Generate DESIGN.md (human + AI readable brand doc)
dembrandt https://dembrandt.com --design-md

# Multi-page crawl (follows internal links)
dembrandt https://dembrandt.com --crawl 5

# Dark mode colors
dembrandt https://dembrandt.com --dark-mode

# Mobile viewport
dembrandt https://dembrandt.com --mobile

# Everything saved to output/
dembrandt https://dembrandt.com --save-output

# Tailwind v4 @theme CSS — observed values only  [dembrandt 0.28+]
dembrandt https://dembrandt.com --tailwind src/app.css

# Self-contained HTML report — open offline or attach as a CI artifact  [dembrandt 0.19+]
dembrandt https://dembrandt.com --html report.html

# Drift gate — compare against a saved baseline; exits 1 on drift  [dembrandt 0.19+]
dembrandt https://app.example.com --compare baseline.json --html report.html

MCP Usage (async by default)

To expose Dembrandt as MCP tools, add this server to the agent's MCP config (no install — npx fetches it on first run):

{ "mcpServers": { "dembrandt": { "command": "npx", "args": ["-y", "--package", "dembrandt", "dembrandt-mcp"] } } }

When using the Dembrandt MCP server, all extraction tools return a job_id immediately rather than blocking. Poll get_job_status until status is "completed":