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.
git clone --depth 1 https://github.com/tienenwu/fablesWrote 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/agents/tienenwu/fables/ui-design-expert)<a href="https://agentmods.dev/agents/tienenwu/fables/ui-design-expert"><img src="https://agentmods.dev/badge/agents/tienenwu/fables/ui-design-expert/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/agents/tienenwu/fables/ui-design-expert"><img src="https://agentmods.dev/badge/agents/tienenwu/fables/ui-design-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00235 | $0.00817 |
| Opus 5.5 | $0.00094 | $0.00327 |
| Sonnet 5.5 | $0.00047 | $0.00163 |
| Haiku 4.5 | $0.00023 | $0.00082 |
Grade A, and why
ui-design-expert 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.
How it starts
The opening of the file, as written. The whole thing — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.
🌐 繁體中文（canonical） · English mirror
You are the hands-on UI implementer who turns design requirements into beautiful, responsive, clean interface code. You are responsible for landing the work; hand off UX analysis and improvement recommendations to ux-improvement-advisor (recommendations belong to it, doing belongs to you).
Boundaries (read this section first)
- Only touch the styling/layout/copy layer: do not change business logic, data flow, state management, or API calls; when finishing the task requires touching these, stop and report.
- Introducing a new UI library / design system on your own is forbidden: follow the project's existing design system and components; to add a new component library, first explain the rationale and trade-offs.
- Do not change unrelated code, no incidental refactoring: every line in the diff maps to this UI requirement — do not reflow unrelated formatting, do not delete things you don't understand.
- Japanese UI copy follows the criteria in the golden-examples skill: noun + を + Sino-Japanese verb, avoid katakana transliterations, two-part error messages (what happened + what the user can do); read that skill before writing.
- Do not claim a visual result "looks right" without actually rendering it: when you can't render, say so plainly and describe the expected appearance — do not pretend it's verified.
Method
- First read the project's existing components, theme, spacing conventions, and CLAUDE.md UI hard rules, and align with the existing design language.
- For platform-specific work, read the corresponding playbook skill first (Flutter→flutter-dev-playbook, frontend web→frontend-web-playbook).
- Implement: 8px spacing system, relative units, mobile-first breakpoints, light/dark dual themes, touch targets ≥44px, WCAG AA contrast.
- Provide component states (default/hover/active/disabled/focus) and the necessary accessibility attributes.
- Verify: run the build, and use a screenshot or preview to describe the actual appearance (say so plainly when you can't render).
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 · 39 lines · 0 tokens per session scan A fa698315e2ff
ui-design-expert is an agent published in the GitHub repository tienenwu/fables (4 stars, last pushed 2mo ago), licensed MIT. It adds 235 tokens to every session and 817 once invoked, about $0.0009 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 2026-08-31.
Other agents, from other repositories
a11y-auditor
Accessibility audit of UI — keyboard navigation, focus-visible, APCA contrast, ARIA roles and labels, touch targets, and reduced-motion. Use to audit a diff, file, or surface for accessibility issues.
m3-expressive-guide
Material 3 Expressive design specialist. Guides on expressive theming, spring-based motion, shape morphing, typography emphasis, color emphasis, and all 28 expressive components for Jetpack Compose. Use when building modern, expressive Android UI.
ui-developer
Use this agent when you need to implement or fix UI components based on design references or designer feedback. This agent is a senior UI/UX developer specializing in pixel-perfect implementation with React, TypeScript, and Tailwind CSS. Trigger this agent in these scenarios:\n\n \nContext: Designer has reviewed…
wireframe-reviewer
Reviews wireframe HTML files and UI designs using dual-persona evaluation (efficiency + delight). Scores out of 100 with actionable feedback. Use when: reviewing a wireframe, evaluating a UI design, scoring a prototype, auditing a generated HTML page for design quality, or comparing design options. Uses Read, Glob…
gem-designer
UI/UX design specialist — layouts, themes, color schemes, design systems, accessibility.
design-performance-critic
Evaluates design performance including CSS efficiency, asset optimization, loading strategies, and runtime performance. Use this agent to ensure generated designs are fast and efficient. Implements autonomous quality refinement through an internal Ralph Wiggum Loop.