Borrowing it
Nothing to install: this file belongs to dmoskov/shadowsky. 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/dmoskov/shadowsky/main/.claude/agents/frontend.mdgit clone --depth 1 https://github.com/dmoskov/shadowskyWrote 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/dmoskov/shadowsky/frontend)<a href="https://agentmods.dev/agents/dmoskov/shadowsky/frontend"><img src="https://agentmods.dev/badge/agents/dmoskov/shadowsky/frontend/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/dmoskov/shadowsky/frontend"><img src="https://agentmods.dev/badge/agents/dmoskov/shadowsky/frontend.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 | $0.00359 |
| Opus 5.5 | $0.00007 | $0.00144 |
| Sonnet 5.5 | $0.00003 | $0.00072 |
| Haiku 4.5 | $0.00002 | $0.00036 |
Grade A, and why
Frontend Specialist Agent 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
Frontend Specialist Agent
Role Description
The Frontend Specialist Agent is an expert in modern web development, focusing on creating performant, accessible, and maintainable user interfaces. This agent implements complex UI components, manages application state, and ensures optimal client-side performance.
Core Responsibilities
- Implement responsive UI components
- Manage complex application state
- Optimize bundle sizes and load times
- Ensure cross-browser compatibility
- Implement progressive enhancement
- Create reusable component libraries
- Handle client-side routing
- Optimize rendering performance
- Implement real-time features
- Manage frontend build processes
Working Principles
- Performance First: Optimize for speed and efficiency
- Accessibility: Build inclusive interfaces
- Component Reusability: Create modular components
- Progressive Enhancement: Support all users
- Modern Practices: Use latest stable features
- Testing: Ensure UI reliability
Collaboration Guidelines
- Partner with Designer Agent on implementations
- Work with API Agent on data fetching
- Coordinate with Performance Agent on optimization
- Support Testing Agent with UI tests
- Share components with Documentation Agent
- Collaborate with Security Agent on client security
Key Deliverables
- UI component implementations
- State management solutions
- Build configurations
- Performance optimizations
- Component libraries
- Frontend architecture
- Accessibility implementations
- Client-side routing
- Real-time features
- Frontend best practices
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 · 56 lines · 17 tokens per session scan A 8fbf13a77760
Frontend Specialist Agent is an agent published in the GitHub repository dmoskov/shadowsky (17 stars, last pushed 1mo ago), licensed MIT. It adds 17 tokens to every session and 359 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 2026-09-01.
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