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 majiayu000/spellbook --skill ui-design-systemgit clone --depth 1 https://github.com/majiayu000/spellbookWrote 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/majiayu000/spellbook/ui-design-system)<a href="https://agentmods.dev/skills/majiayu000/spellbook/ui-design-system"><img src="https://agentmods.dev/badge/skills/majiayu000/spellbook/ui-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/majiayu000/spellbook/ui-design-system"><img src="https://agentmods.dev/badge/skills/majiayu000/spellbook/ui-design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00032 | $0.00250 |
| Opus 5.5 | $0.00013 | $0.00100 |
| Sonnet 5.5 | $0.00006 | $0.00050 |
| Haiku 4.5 | $0.00003 | $0.00025 |
Grade A, and why
ui-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 1mo 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.
What it actually says
UI Design System Toolkit
Professional toolkit for creating and maintaining scalable design systems.
Core Capabilities
- Design token generation (colors, typography, spacing)
- Component system architecture
- Responsive design calculations
- Accessibility compliance
- Developer handoff documentation
Key Scripts
design_token_generator.py
Generates complete design system tokens from brand colors.
Usage: python scripts/design_token_generator.py [brand_color] [style] [format]
- Styles: modern, classic, playful
- Formats: json, css, scss
Features:
- Complete color palette generation
- Modular typography scale
- 8pt spacing grid system
- Shadow and animation tokens
- Responsive breakpoints
- Multiple export formats
Verification
Before reporting completion, validate generated tokens or handoff artifacts against the requested brand color, output format, accessibility constraints, and the target implementation surface. For script usage, run the command with representative input and inspect the emitted JSON/CSS/SCSS for valid syntax and preserved brand values.
What ships with it
1 file 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.
- 1mo ago First seen · 37 lines · 32 tokens per session scan A acc46cb7a8cd
ui-design-system is a skill published in the GitHub repository majiayu000/spellbook (288 stars, last pushed yesterday), licensed MIT. It adds 32 tokens to every session and 250 once invoked, about $0.0001 per session on Opus 5.5. 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.
Other skills, from other repositories
Webdesign
Design and integrate web interfaces via three paths: DirectDesign (write design inline with Anthropic frontend-design philosophy — the default workhorse), native /design + /design-sync Claude Code commands (preferred for code integration and design-system sync), or ClaudeDesign (drive claude.ai/design through…
lov-maintain-partners
Maintain the Skill Publisher website's partners section AND align partner logo rows on event posters / hero strips: reuse lov-find-logo for brand logo discovery, normalize collected logos to a 240px-tall content canvas (retina-ready), rasterize SVGs via rsvg-convert before normalizing (so SVG viewBox padding gets…
web-design-expert
Web design and UX guidance for visual systems, accessibility, interaction patterns, and performance-aware interfaces. Use when designing a website's look and feel, improving UX/accessibility, or reviewing a UI for polish and performance.
lov-oh-my-landingpage
A landing-page creation and redesign skill that derives a product’s positioning, story, and visual direction from its actual product and brand facts. It then implements the page responsively and checks the result against the intended product message.
shadcn
Current best-practices guide for shadcn/ui applications. Before applying primitive-specific guidance, inspect whether the checked-in components use Radix UI or Base UI; current shadcn supports both (Base UI is the default for new projects) and their composition APIs differ. Component installs and upgrades go through…
lov-frontend-design
A frontend design guide for turning requirements, existing screens, and real media into usable pages and components. It covers visual design, navigation, interaction details, animation, images, audio, and video.