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.
npx skills add jezweb/claude-skills --skill design-systemgit clone --depth 1 https://github.com/jezweb/claude-skillsWrote 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.
[](https://agentmods.dev/skills/jezweb/claude-skills/design-system)<a href="https://agentmods.dev/skills/jezweb/claude-skills/design-system"><img src="https://agentmods.dev/badge/skills/jezweb/claude-skills/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.
<a href="https://agentmods.dev/skills/jezweb/claude-skills/design-system"><img src="https://agentmods.dev/badge/skills/jezweb/claude-skills/design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector pass
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 | $0.00095 | $0.02088 |
| Opus 5 | $0.00048 | $0.01044 |
| Sonnet 5 | $0.00019 | $0.00418 |
| Haiku 4.5 | $0.00010 | $0.00209 |
Grade A, and why
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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 230 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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.mdbefore 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):
playwright-cli -s=design resize 375 812 playwright-cli -s=design screenshot --filename=.design/screenshots/source-mobile.png -
Close the session:
playwright-cli -s=design close
From a Local HTML File
Read the file directly and extract design tokens from the source.
From a Screenshot Only
Analyse the image visually. Note: colour extraction will be approximate without HTML source. Flag this limitation in the output.
From a Google Stitch Project
If @google/stitch-sdk is installed and STITCH_API_KEY is set:
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.
- 6d ago First seen · 230 lines · 95 tokens per session scan A d5583191747d
design-system is a skill published in the GitHub repository jezweb/claude-skills (999 stars, last pushed 2mo ago), licensed MIT. It adds 95 tokens to every session and 2,088 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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