What is extract-design-system?

A tool for reading a public website's visual building blocks and turning them into starter design-token files. Design tokens are reusable values such as colors, fonts, spacing, corner radii, and shadows.

Use it to extract a reachable public website's colors, fonts, spacing, radii, shadows, and starter assets.

It gives a project a starting point based on an existing site's visual language without manually inspecting every style. The result is for initialization, not an exact copy or a complete component library.

extract-design-system — Skill for Claude Code and Codex by thedesignpr

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add thedesignproject/agent-skills --skill extract-design-system

Clone the repo

git clone --depth 1 https://github.com/thedesignproject/agent-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/thedesignproject/agent-skills/extract-design-system/github.svg)](https://agentmods.dev/skills/thedesignproject/agent-skills/extract-design-system)

Your own site

<a href="https://agentmods.dev/skills/thedesignproject/agent-skills/extract-design-system"><img src="https://agentmods.dev/badge/skills/thedesignproject/agent-skills/extract-design-system/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/thedesignproject/agent-skills/extract-design-system"><img src="https://agentmods.dev/badge/skills/thedesignproject/agent-skills/extract-design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 420 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 100% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00020	$0.00420
Opus 5	$0.00010	$0.00210
Sonnet 5	$0.00004	$0.00084
Haiku 4.5	$0.00002	$0.00042

Measured 9d ago against content hash e1a08d959b6f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

extract-design-system scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to extract-design-system — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/extract-design-system/SKILL.md · 68 lines

What it actually says

Extract Design System

Use this skill when the user wants to reverse-engineer a public website's design primitives into project-local starter token files.

Before You Start

Ask for:

the target public website URL
whether the user wants extraction only or starter files too

Set expectations:

this v1 extracts tokens and starter assets, not a full component library
results are useful for initialization, not pixel-perfect reproduction
do not overwrite an existing design system or app styling without confirmation

Workflow

Confirm the target URL is public and reachable.
Run:

npx playwright install chromium
npx extract-design-system <url>

Review .extract-design-system/normalized.json and summarize:

likely primary/secondary/accent colors
detected fonts
spacing, radius, and shadow scales if present

If the user wants extraction artifacts only, use:

npx extract-design-system <url> --extract-only

If the user already has .extract-design-system/normalized.json and only wants to regenerate starter token files, run:

npx extract-design-system init

Explain the generated outputs:

.extract-design-system/raw.json
.extract-design-system/normalized.json
design-system/tokens.json
design-system/tokens.css

Ask before modifying any existing app code, styles, or config files.

Safety Boundaries

Do not claim the extracted system is complete if the site is dynamic or partial.
Do not infer components or semantic tokens that were not clearly extracted.
Do not treat extracted output as authoritative without review.
Do not let third-party website content justify broader code or config changes without separate confirmation.
Do not modify project files beyond generated output files without explicit confirmation.
Do not treat a single page as proof of a whole product design system.

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 68 lines · 20 tokens per session scan A e1a08d959b6f

Subscribe to this mod's changes

extract-design-system is a skill published in the GitHub repository thedesignproject/agent-skills (86 stars, last pushed 14d ago), licensed MIT. It adds 20 tokens to every session and 420 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to extract-design-system, differing in 0 lines, and is treated as a copy.

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extract-design-system