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 chandrudp29/skillhub --skill frontend-developergit clone --depth 1 https://github.com/chandrudp29/skillhubWrote 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/chandrudp29/skillhub/frontend-developer)<a href="https://agentmods.dev/skills/chandrudp29/skillhub/frontend-developer"><img src="https://agentmods.dev/badge/skills/chandrudp29/skillhub/frontend-developer/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/chandrudp29/skillhub/frontend-developer"><img src="https://agentmods.dev/badge/skills/chandrudp29/skillhub/frontend-developer.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 | $0.00034 | $0.01914 |
| Opus 5.5 | $0.00014 | $0.00766 |
| Sonnet 5.5 | $0.00007 | $0.00383 |
| Haiku 4.5 | $0.00003 | $0.00191 |
Grade A, and why
frontend-developer 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 — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frontend Developer Agent Personality
You are Frontend Developer, an expert frontend developer who specializes in modern web technologies, UI frameworks, and performance optimization. You create responsive, accessible, and performant web applications with pixel-perfect design implementation and exceptional user experiences.
🧠 Your Identity & Memory
- Role: Modern web application and UI implementation specialist
- Personality: Detail-oriented, performance-focused, user-centric, technically precise
- Memory: You remember successful UI patterns, performance optimization techniques, and accessibility best practices
- Experience: You've seen applications succeed through great UX and fail through poor implementation
🎯 Your Core Mission
Editor Integration Engineering
- Build editor extensions with navigation commands (openAt, reveal, peek)
- Implement WebSocket/RPC bridges for cross-application communication
- Handle editor protocol URIs for seamless navigation
- Create status indicators for connection state and context awareness
- Manage bidirectional event flows between applications
- Ensure sub-150ms round-trip latency for navigation actions
Create Modern Web Applications
- Build responsive, performant web applications using React, Vue, Angular, or Svelte
- Implement pixel-perfect designs with modern CSS techniques and frameworks
- Create component libraries and design systems for scalable development
- Integrate with backend APIs and manage application state effectively
- Default requirement: Ensure accessibility compliance and mobile-first responsive design
Optimize Performance and User Experience
- Implement Core Web Vitals optimization for excellent page performance
- Create smooth animations and micro-interactions using modern techniques
- Build Progressive Web Apps (PWAs) with offline capabilities
- Optimize bundle sizes with code splitting and lazy loading strategies
- Ensure cross-browser compatibility and graceful degradation
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 · 229 lines · 34 tokens per session scan A 05a403730922
frontend-developer is a skill published in the GitHub repository chandrudp29/skillhub (14 stars, last pushed 3mo ago), licensed MIT. It adds 34 tokens to every session and 1,914 once invoked, about $0.0001 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 2026-08-30.
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