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 nathanonn/agent-skills --skill extract-design-mdgit clone --depth 1 https://github.com/nathanonn/agent-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/nathanonn/agent-skills/extract-design-md)<a href="https://agentmods.dev/skills/nathanonn/agent-skills/extract-design-md"><img src="https://agentmods.dev/badge/skills/nathanonn/agent-skills/extract-design-md/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/nathanonn/agent-skills/extract-design-md"><img src="https://agentmods.dev/badge/skills/nathanonn/agent-skills/extract-design-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 193 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00177 | $0.03397 |
| Opus 5 | $0.00088 | $0.01699 |
| Sonnet 5 | $0.00035 | $0.00679 |
| Haiku 4.5 | $0.00018 | $0.00340 |
Grade A, and why
extract-design-md 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 11d 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 — 264 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Extract DESIGN.md from a site
Given a live URL, produce a DESIGN.md —
YAML design tokens (colors, typography, rounded, spacing, components) plus
prose in canonical section order — good enough to hand a coding agent so it builds
new UI matching the source site.
Core idea (from research): tokens map ~1:1 to a site's CSS custom properties + computed styles, so the heavy lifting is a cheap in-browser extraction — not vision. Screenshots feed prose only. The official linter is a free quality gate.
URL ─▶ 1 DISCOVER ─▶ 2 EXTRACT TOKENS ─▶ 3 HARVEST COMPONENTS
─▶ 4 CAPTURE FEEL ─▶ 5 SYNTHESIZE ─▶ 6 VALIDATE ─▶ DESIGN.md
Prerequisites
This skill drives three external tools — make sure each is available before running:
- playwright-cli on
PATH— the in-browser extraction and screenshots run through it. Install once withnpm install -g @playwright/cli@latestthenplaywright-cli install --skills(needs Node.js 18+). Check:which playwright-cli. - A reachable Firecrawl instance — used for page
discovery (
firecrawl map) and optional copy scraping. The hosted API or a self-hosted / local instance both work; if Firecrawl is unreachable the skill falls back to playwright link discovery (thinner page coverage). Confirm your instance responds before a run. npx(Node.js) — pulls the official@google/design.mdlinter on demand for the quality gate. If it's unavailable the skill writes the file anyway and notes "lint skipped".
If your agent sandboxes network or filesystem access, allow the outbound calls this skill makes (headless browsing, Firecrawl,
npx) before running.
Let SKILL = this skill's directory. Pick a stable playwright session name, e.g. S=designmd.
Flags
| Flag | Default | Effect |
|---|---|---|
<url> |
required | Entry-point URL |
--pages <n> |
5 | Max pages to sample |
--pages-list <paths> |
auto | Pin exact pages (skips the confirm prompt) |
--no-screenshots |
shots ON | Skip the feel pass; prose then leans on token names + copy |
--theme <auto|light|dark|both> |
auto |
auto detects; both forces dual; light/dark pin one |
--out <dir> |
.design_mds/<domain>-YYYYMMDD/ |
Output folder |
--no-lint |
lint ON | Skip the linter (auto-skips if npx is unavailable) |
What ships with it
5 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.
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.
- 11d ago First seen · 264 lines · 177 tokens per session scan A 67ca5d989ae4
extract-design-md is a skill published in the GitHub repository nathanonn/agent-skills (19 stars, last pushed 22d ago), licensed MIT. It adds 177 tokens to every session and 3,397 once invoked, about $0.0009 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 2026-08-30.
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