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-bettergit 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-better)<a href="https://agentmods.dev/skills/buildgreatproducts/builder-os/design-better"><img src="https://agentmods.dev/badge/skills/buildgreatproducts/builder-os/design-better/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/buildgreatproducts/builder-os/design-better"><img src="https://agentmods.dev/badge/skills/buildgreatproducts/builder-os/design-better.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00250 | $0.05426 |
| Opus 5 | $0.00125 | $0.02713 |
| Sonnet 5 | $0.00050 | $0.01085 |
| Haiku 4.5 | $0.00025 | $0.00543 |
Grade A, and why
design-better 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 10d 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 — 258 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Better
A craft layer for any coding agent generating or reviewing UI. Style is owned by docs/design.md; this skill owns the timeless UX/UI craft heuristics — drawn from Nielsen Norman Group, the Laws of UX, Shneiderman, Refactoring UI, WCAG 2.2, Don Norman, Apple HIG, Material 3, and 2025–2026 AI-product patterns — that separate "shipped" from "designed."
Boundary. When a heuristic implies a visual property, reference a
docs/design.mdtoken by name ({colors.primary},{rounded.md}). Ifdocs/design.mddoesn't have the token, flag it as a New Pattern to add via the Design System skill — never inline hex, font names, or arbitrary px. Ifdocs/design.mddoesn't exist at all, follow the codebase's existing convention for that property (theme config, CSS custom properties, component library) and note it.
Inputs
docs/design.md— the style layer (recommended, not required). When present, reference its tokens by name for every visual decision. When absent, this skill still applies: fall back to the codebase's existing design conventions (theme config, CSS custom properties, existing components) as the style source, and recommend running the Design System skill to establish a single token source of truth (part of BuilderOS: https://github.com/BuildGreatProducts/builder-os).- The thing being built or refactored — a brief, a file, or uncommitted diff.
docs/product-vision.md— optional. Its strategy and brand inform microcopy tone and help weight which heuristic categories dominate.
Workflow
- Establish the style source. If
docs/design.mdexists, parse its token catalogue (colors, typography, rounded, spacing, components) and the markdown rules (elevation, shape, Do's and Don'ts). If it doesn't, identify the codebase's existing design conventions — theme config (e.g. Tailwind/tokens), CSS custom properties, the component library in use — and treat those as the style source, then recommend the Design System skill so future work has a documented source of truth.
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.
- 10d ago First seen · 258 lines · 250 tokens per session scan A c0ef36c9f2ee
design-better is a skill published in the GitHub repository BuildGreatProducts/builder-os (218 stars, last pushed 2mo ago), licensed MIT. It adds 250 tokens to every session and 5,426 once invoked, about $0.0013 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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