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 charlieviettq/awesome-agent-skill --skill frontend-ui-engineeringgit clone --depth 1 https://github.com/charlieviettq/awesome-agent-skillWrote 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/charlieviettq/awesome-agent-skill/frontend-ui-engineering)<a href="https://agentmods.dev/skills/charlieviettq/awesome-agent-skill/frontend-ui-engineering"><img src="https://agentmods.dev/badge/skills/charlieviettq/awesome-agent-skill/frontend-ui-engineering/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/charlieviettq/awesome-agent-skill/frontend-ui-engineering"><img src="https://agentmods.dev/badge/skills/charlieviettq/awesome-agent-skill/frontend-ui-engineering.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 | $0.00036 | $0.00396 |
| Opus 5 | $0.00018 | $0.00198 |
| Sonnet 5 | $0.00007 | $0.00079 |
| Haiku 4.5 | $0.00004 | $0.00040 |
Grade A, and why
frontend-ui-engineering 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 9d 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
Frontend UI Engineering
End-to-end UI implementation: structure, styling, responsive behavior, state, and accessibility. Extends frontend-ui-accessibility with architecture and design-system discipline.
When to use
- New page, form, or interactive component
- Refactoring UI for consistency or responsiveness
- Applying or extending a design system
When not to use
- Backend-only change
- Accessibility audit only (use
frontend-ui-accessibility) - Full visual redesign exploration (consider design consultation workflows)
Workflow
- Inventory — existing components, tokens, patterns to reuse
- Structure — semantic HTML; split presentational vs container components
- Layout — mobile-first breakpoints; avoid fixed widths that break small screens
- State — local vs shared; minimize prop drilling; document async/loading/error UI
- Styling — tokens (color, spacing, type); no magic numbers scattered
- A11y — keyboard, focus, labels, contrast (see
frontend-ui-accessibility) - Verify — key viewports; critical user paths; no console errors
Checklist
| Area | Check |
|---|---|
| Components | Single responsibility; reusable primitives |
| Responsive | Works at 320px and desktop; touch targets adequate |
| Loading/empty/error | All three states designed |
| Performance | Avoid unnecessary re-renders; lazy-load heavy assets |
| A11y | Focus order, ARIA only when needed, form labels |
Output
- Implemented components with consistent patterns
- Brief note on new tokens or patterns added to the design system
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.
- 9d ago First seen · 47 lines · 36 tokens per session scan A 119a609dc6d9
frontend-ui-engineering is a skill published in the GitHub repository charlieviettq/awesome-agent-skill (26 stars, last pushed 1mo ago), licensed MIT. It adds 36 tokens to every session and 396 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 2026-09-03.
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