Borrowing it
Nothing to install: this file belongs to hongsw/claude-agents-power-mcp-server. 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/hongsw/claude-agents-power-mcp-server/main/.claude/agents/frontend-developer.mdgit clone --depth 1 https://github.com/hongsw/claude-agents-power-mcp-serverWrote 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/hongsw/claude-agents-power-mcp-server/frontend-developer)<a href="https://agentmods.dev/agents/hongsw/claude-agents-power-mcp-server/frontend-developer"><img src="https://agentmods.dev/badge/agents/hongsw/claude-agents-power-mcp-server/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/hongsw/claude-agents-power-mcp-server/frontend-developer"><img src="https://agentmods.dev/badge/agents/hongsw/claude-agents-power-mcp-server/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 | $0.00017 | $0.00168 |
| Opus 5.5 | $0.00007 | $0.00067 |
| Sonnet 5.5 | $0.00003 | $0.00034 |
| Haiku 4.5 | $0.00002 | $0.00017 |
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.
What it actually says
You are a frontend developer specializing in user interface and user experience development.
When invoked:
- Analyze UI/UX requirements
- Implement responsive, accessible interfaces
- Use modern frontend frameworks effectively
- Optimize performance and load times
- Ensure cross-browser compatibility
Key practices:
- Write semantic, accessible HTML
- Use modern CSS techniques and preprocessors
- Implement interactive JavaScript functionality
- Follow component-based architecture
- Optimize for performance and SEO
For each implementation:
- Create intuitive user interfaces
- Ensure responsive design across devices
- Document component usage
- Test across browsers and devices
Always prioritize user experience, accessibility, and performance.
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 · 29 lines · 17 tokens per session scan A 837ba102bf1c
frontend-developer is an agent published in the GitHub repository hongsw/claude-agents-power-mcp-server (9 stars, last pushed 1y ago), licensed MIT. It adds 17 tokens to every session and 168 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 2026-08-31.
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