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Design System Extractor · jezweb | DecimalAI

design mediaby jezweb

Design System Extractor

jezweb/design-system

Source jezweb/claude-skills ↗License MIT

Extract a complete design system from an existing website or screenshot into a DESIGN.md file. Analyses colours, typography, component styles, spacing, and atmosphere through browser automation and HTML inspection. Produces a semantic design system document optimised for consistent page generation. Triggers: 'extract design system', 'design system', 'create DESIGN.md', 'analyse the design', 'what design does this site use', 'extract styles from', 'reverse engineer the design'.

SkillScore77Maintained

Automatic

Design & UX Review pack

Last verified 8/14/2026

What it changes

Passed 16 of 21 test cases with the skill, and 9 of 21 without it.

Without skill41%

With skill77%

Checks it passed that the model alone missed

Maps `customColor` as the Primary brand color token.
Identifies forms as a key component pattern to extract.
Executes Playwright CLI commands to inspect the live URL.

and 8 more in the full report

8 fixed9 passed either way5 still failing0 broke

Pass-rate lift: +36 pp
Tokens: +67%
Agent turns: 0%
Response time: -30%

Model gemini-3.6-flashMeasured 8/14/2026v117 of 22 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/jezweb-design-system/SKILL.md https://app.decimal.ai/s/jezweb-design-system/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add jezweb-design-system, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/jezweb-design-system/ and pins it in .decimal/skills.lock

decimalai skills add jezweb-design-system

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/jezweb-design-system/SKILL.md https://app.decimal.ai/s/jezweb-design-system/SKILL.md

Raw file: /s/jezweb-design-system/SKILL.md ↗ · machine-readable summary at /s/jezweb-design-system.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

We want to make sure our `.design/DESIGN.md` output file adheres strictly to the required template sections. What are the six core required sections that must be present?

What was checked, without and with the skill
Checked	Without skill	With skill
Lists Visual Theme & Atmosphere as one of the required sections.	Missed	Passed
Lists Design System Notes for Generation as one of the required sections.	Missed	Passed

case-13 · gemini-3.6-flash · 8/14/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md216 linessingle file

Design System Extractor

Analyse an existing website, HTML file, or screenshot and synthesise a semantic design system into a DESIGN.md file. The output is optimised for use with the design-loop skill and general page generation.

When to Use

Starting a new project based on an existing site's visual language
Documenting a site's design system that was never formally written down
Preparing .design/DESIGN.md before running the design loop
Extracting brand guidelines from a client's existing website
Creating consistency documentation for a multi-page project
Extracting design tokens from a Google Stitch project

Workflow

Step 1: Identify the Source

Ask the user for one of:

Source	Method
Live URL	Browse via Playwright CLI or scraper, screenshot + extract HTML
Local HTML file	Read the file directly
Screenshot image	Analyse visually (limited — no exact hex extraction)
Existing project	Scan `site/public/` for HTML files to analyse
Stitch project	Use `@google/stitch-sdk` to fetch screen HTML + design theme

Step 2: Extract Raw Design Data

From a Live URL

Browse the site using Playwright CLI:

playwright-cli -s=design open {url}
playwright-cli -s=design screenshot --filename=.design/screenshots/source-desktop.png

Extract the full HTML — either via scraper MCP or by reading the page source
Resize and screenshot mobile (375px):

Track record

Benchmark

16 / 21

test cases passed, vs 9 / 21 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

jezweb / claude-skills

plugins/frontend/skills/design-system/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

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Ready to supercharge your AI agents?

See it in action

What's inside

Design System Extractor

When to Use

Workflow

Step 1: Identify the Source

Step 2: Extract Raw Design Data

From a Live URL

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills