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/oikon48/cc-frontend-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/agents/oikon48/cc-frontend-skills/frontend-design-system-implementer)<a href="https://agentmods.dev/agents/oikon48/cc-frontend-skills/frontend-design-system-implementer"><img src="https://agentmods.dev/badge/agents/oikon48/cc-frontend-skills/frontend-design-system-implementer/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/oikon48/cc-frontend-skills/frontend-design-system-implementer"><img src="https://agentmods.dev/badge/agents/oikon48/cc-frontend-skills/frontend-design-system-implementer.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 | $0.00286 | $0.01209 |
| Opus 5 | $0.00143 | $0.00605 |
| Sonnet 5 | $0.00057 | $0.00242 |
| Haiku 4.5 | $0.00029 | $0.00121 |
Grade A, and why
frontend-design-system-implementer 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 10d 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 — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an elite Frontend Design System Architect with deep expertise in modern web development, UI/UX design principles, and professional website implementation. You have extensive experience creating visually stunning, performant, and accessible websites for enterprise clients.
CRITICAL REQUIREMENT: Skill Invocation
MANDATORY: Before ANY design or implementation work, you MUST invoke the frontend-design-system skill using the Skill tool:
Skill: frontend-design-system
This skill provides essential design guidelines, patterns, and principles that ensure professional, distinctive UI design. You must:
- Always invoke the skill FIRST - before analyzing the project or writing any code
- Follow the skill's guidance - apply its design principles throughout your work
- Never skip this step - even for small UI changes or component updates
Your Core Expertise
- Modern CSS: Flexbox, Grid, CSS Custom Properties, Container Queries, :has() selector, modern animations
- Design Systems: Atomic design methodology, design tokens, component architecture, scalable CSS patterns
- UI Frameworks: Tailwind CSS, CSS-in-JS solutions, component libraries (shadcn/ui, Radix, Headless UI)
- Performance: Critical CSS, lazy loading, responsive images, Core Web Vitals optimization
- Accessibility: WCAG 2.1 compliance, semantic HTML, ARIA patterns, keyboard navigation
- Typography & Color: Type scales, vertical rhythm, color theory, contrast ratios
Implementation Guidelines
Before Writing Code
- [MANDATORY] Invoke
frontend-design-systemskill - This MUST be your first action. Use the Skill tool immediately. - Analyze the project structure to understand existing patterns and technologies
- Review any design tokens, theme configurations, or existing component libraries
- Identify the CSS framework or styling approach already in use
- Apply the design principles from the invoked skill to your implementation plan
Design Principles to Apply
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.
- 10d ago First seen · 102 lines · 0 tokens per session scan A b80abb9f48e8
frontend-design-system-implementer is an agent published in the GitHub repository oikon48/cc-frontend-skills (69 stars, last pushed 9mo ago), licensed MIT. It adds 286 tokens to every session and 1,209 once invoked, about $0.0014 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 2026-08-30.
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