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 flitzrrr/frontend-design-skills --skill ui-designgit clone --depth 1 https://github.com/flitzrrr/frontend-design-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/flitzrrr/frontend-design-skills/ui-design)<a href="https://agentmods.dev/skills/flitzrrr/frontend-design-skills/ui-design"><img src="https://agentmods.dev/badge/skills/flitzrrr/frontend-design-skills/ui-design/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/flitzrrr/frontend-design-skills/ui-design"><img src="https://agentmods.dev/badge/skills/flitzrrr/frontend-design-skills/ui-design.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 | $0.00040 | $0.01293 |
| Opus 5 | $0.00020 | $0.00647 |
| Sonnet 5 | $0.00008 | $0.00259 |
| Haiku 4.5 | $0.00004 | $0.00129 |
Grade A, and why
ui-design 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 12d 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 — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.
UI Design
Professional web interfaces through systematic layouts, clear visual hierarchy, and consistent components.
Scope
Use this skill when: You are creating layouts, designing UI components, establishing visual hierarchy, defining grid systems, building styleguides or design tokens, or auditing existing interfaces for visual consistency.
Principles
1. User-Centered Design Over Aesthetics
Every design decision is guided by the needs of the target audience. An interface that is visually impressive but poorly usable has failed.
2. Visual Hierarchy Determines Perception
Size, color, contrast, and position control what users see first. Every page needs exactly ONE primary focal point.
3. Consistency Builds Trust
Identical elements must look and behave identically everywhere. Inconsistency increases cognitive load.
4. Reduction Is Strength
Every element without a measurable purpose must be removed. Whitespace is not wasted space -- it improves readability and focus.
5. The Grid Is the Foundation
Without a grid system, there is no professional layout. The grid enforces alignment, creates rhythm, and enables responsive design.
Rules
Layout & Grid
- DO: Use a 12-column grid as the basis for desktop (divisible by 2, 3, 4, 6).
- DO: Use an 8px baseline grid for all spacing (8, 16, 24, 32, 48, 64px).
- DO: Set a maximum content width of 1200-1440px.
- DON'T: Mix different grid systems within one application.
- DON'T: Place more than 3-4 content blocks side by side on desktop, or more than 1-2 on mobile.
Visual Hierarchy
- DO: Establish at least 3 hierarchy levels: primary (hero), secondary (features), tertiary (details).
- DO: Make the most important element at least 1.5x larger than the second most important.
- DON'T: Use more than 3 different font sizes within a single viewport area.
- DON'T: Place multiple equally weighted CTAs in the same viewport. One primary CTA per viewport.
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.
- 12d ago First seen · 127 lines · 40 tokens per session scan A 635a78f9349e
ui-design is a skill published in the GitHub repository flitzrrr/frontend-design-skills (5 stars, last pushed 5mo ago), licensed MIT. It adds 40 tokens to every session and 1,293 once invoked, about $0.0002 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 2026-08-31.
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