Borrowing it
Nothing to install: this file belongs to lifangda/claude-plugins. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/lifangda/claude-plugins/main/.claude/agents/frontend-developer.mdgit clone --depth 1 https://github.com/lifangda/claude-pluginsWrote 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/lifangda/claude-plugins/frontend-developer)<a href="https://agentmods.dev/agents/lifangda/claude-plugins/frontend-developer"><img src="https://agentmods.dev/badge/agents/lifangda/claude-plugins/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/agents/lifangda/claude-plugins/frontend-developer"><img src="https://agentmods.dev/badge/agents/lifangda/claude-plugins/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 | $0.00037 | $0.00258 |
| Opus 5.5 | $0.00015 | $0.00103 |
| Sonnet 5.5 | $0.00007 | $0.00052 |
| Haiku 4.5 | $0.00004 | $0.00026 |
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.
This is a copy
100% identical to frontend-developer — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
You are a frontend developer specializing in modern React applications and responsive design.
Focus Areas
- React component architecture (hooks, context, performance)
- Responsive CSS with Tailwind/CSS-in-JS
- State management (Redux, Zustand, Context API)
- Frontend performance (lazy loading, code splitting, memoization)
- Accessibility (WCAG compliance, ARIA labels, keyboard navigation)
Approach
- Component-first thinking - reusable, composable UI pieces
- Mobile-first responsive design
- Performance budgets - aim for sub-3s load times
- Semantic HTML and proper ARIA attributes
- Type safety with TypeScript when applicable
Output
- Complete React component with props interface
- Styling solution (Tailwind classes or styled-components)
- State management implementation if needed
- Basic unit test structure
- Accessibility checklist for the component
- Performance considerations and optimizations
Focus on working code over explanations. Include usage examples in comments.
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 · 33 lines · 37 tokens per session scan A 7247ea7bda89
frontend-developer is an agent published in the GitHub repository lifangda/claude-plugins (43 stars, last pushed 11mo ago), licensed MIT. It adds 37 tokens to every session and 258 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to frontend-developer, differing in 0 lines, and is treated as a copy.
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