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 jnPiyush/AgentX --skill frontend-uigit clone --depth 1 https://github.com/jnPiyush/AgentXWrote 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/jnpiyush/agentx/frontend-ui)<a href="https://agentmods.dev/skills/jnpiyush/agentx/frontend-ui"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/frontend-ui/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/jnpiyush/agentx/frontend-ui"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/frontend-ui.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 | $0.00051 | $0.01703 |
| Opus 5.5 | $0.00020 | $0.00681 |
| Sonnet 5.5 | $0.00010 | $0.00341 |
| Haiku 4.5 | $0.00005 | $0.00170 |
Grade A, and why
frontend-ui 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 — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend/UI Development
Purpose: Production-ready frontend development standards for HTML, CSS, Tailwind CSS, and responsive design. Audience: Frontend engineers building web interfaces with modern HTML/CSS and utility-first frameworks. Standard: Follows github/awesome-copilot frontend development patterns.
When to Use This Skill
- Building responsive web layouts with HTML5 and CSS3
- Styling with Tailwind CSS utility classes
- Implementing accessible web forms
- Optimizing frontend loading performance
- Creating common UI layout patterns
Prerequisites
- HTML5 and CSS3 fundamentals
- Node.js installed for Tailwind CSS build tools
Quick Reference
| Need | Solution | Pattern |
|---|---|---|
| Responsive layout | Mobile-first with Tailwind | flex md:grid grid-cols-3 |
| Semantic HTML | Use proper elements | <nav>, <main>, <article> |
| Accessibility | ARIA labels + keyboard nav | aria-label="Close menu" |
| Color contrast | WCAG AA minimum (4.5:1) | Use color tools for validation |
| Typography | Tailwind text utilities | text-base md:text-lg |
| Spacing | Consistent Tailwind scale | p-4 md:p-6 lg:p-8 |
Decision Tree
Building a frontend UI?
+-- Need a page layout?
| +-- Simple landing page -> Semantic HTML + Tailwind utilities
| +-- Multi-column dashboard -> CSS Grid with responsive breakpoints
| +-- Sidebar + content -> Flexbox with fixed/fluid split
+-- Need interactive components?
| +-- Forms with validation -> Semantic <form> + ARIA + native validation
| +-- Modals / dialogs -> <dialog> element + focus trap
| +-- Navigation menus -> <nav> + keyboard + aria-expanded
+-- Need styling approach?
| +-- Utility-first, rapid dev -> Tailwind CSS
| +-- Pre-built components -> Bootstrap or component library
| +-- Custom design system -> CSS custom properties + BEM
+-- Need accessibility audit?
| -> Run WAVE / axe-core, fix contrast + ARIA + keyboard nav
+-- Need performance optimization?
-> Defer scripts, lazy-load images, minimize CSS
What ships with it
2 files 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 Changed d8f7e9e49dfc
- 1mo ago First seen · 173 lines · 51 tokens per session scan A ec9b9d435ace
frontend-ui is a skill published in the GitHub repository jnPiyush/AgentX (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 51 tokens to every session and 1,703 once invoked, about $0.0002 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.
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