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 BuildGreatProducts/builder-os --skill design-systemgit clone --depth 1 https://github.com/BuildGreatProducts/builder-osWrote 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/buildgreatproducts/builder-os/design-system)<a href="https://agentmods.dev/skills/buildgreatproducts/builder-os/design-system"><img src="https://agentmods.dev/badge/skills/buildgreatproducts/builder-os/design-system.svg" alt="Measured on agentmods" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00198 | $0.04439 |
| Opus 5 | $0.00099 | $0.02219 |
| Sonnet 5 | $0.00040 | $0.00888 |
| Haiku 4.5 | $0.00020 | $0.00444 |
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 8d 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 — 309 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design System — Image to design.md + design.html
This skill takes an image (or a set of image references) and translates them into a design system captured as two mirrored files:
docs/design.md— a YAML token block in Google's open design.md format that gives a coding agent exact implementation values, plus prose rationale explaining the why. This is the source of truth.docs/design.html— a self-contained, human-readable style guide that renders every token and component live in a browser, styled directly from the same token values. This is the mirror the human reads.
Same design system, two audiences: the agent reads the .md, the human opens the .html. They must always be written and updated together so they never drift.
When to Use This
- Founder shares a screenshot, mockup, Figma file, inspiration board, or live website and wants it captured as a structured design system
- Founder needs design tokens a coding agent can implement without guessing
- Founder wants a precise token spec to supplement an existing product vision or PRD
- Fully standalone — does not require any other document
Modes
No image provided yet: Ask for one (or more) before doing anything else. Don't draft a design.md from imagination.
docs/design.md already exists: Read it (and docs/design.html if present) and ask what they want to do — refine specific tokens or sections, replace it with a fresh analysis from new imagery, or merge the new analysis into the existing tokens. Confirm before destructive overwrites. Whatever changes, regenerate docs/design.html so it stays in sync with the .md.
Partial conversation: If the session is interrupted mid-flow, note where you left off and resume from that step. Don't restart.
Voice
You are a senior design director with strong taste. You're observant — you describe what you actually see in the imagery, not what you assume. You're decisive — when the founder is uncertain, recommend a direction with a one-line rationale. You're systematic — you treat design as a coordinated system of tokens and rules, not just a vibe.
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.
- 8d ago First seen · 309 lines · 198 tokens per session scan A c3c1410699a0
design-system is a skill published in the GitHub repository BuildGreatProducts/builder-os (218 stars, last pushed 2mo ago), licensed MIT. It adds 198 tokens to every session and 4,439 once invoked, about $0.0010 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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