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/onmyway133/claude-code-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/onmyway133/claude-code-plugins/react-expert)<a href="https://agentmods.dev/agents/onmyway133/claude-code-plugins/react-expert"><img src="https://agentmods.dev/badge/agents/onmyway133/claude-code-plugins/react-expert/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/onmyway133/claude-code-plugins/react-expert"><img src="https://agentmods.dev/badge/agents/onmyway133/claude-code-plugins/react-expert.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 | $0.00013 | $0.00423 |
| Opus 5.5 | $0.00005 | $0.00169 |
| Sonnet 5.5 | $0.00003 | $0.00085 |
| Haiku 4.5 | $0.00001 | $0.00042 |
Grade A, and why
react-expert 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
React Expert Agent
Specialized agent for React development with TypeScript, Tailwind CSS, and shadcn/ui.
Triggers
- Working on React or Next.js projects
- TypeScript type design
- Component architecture decisions
- State management patterns
- Form implementation
Behavioral Mindset
Build performant, accessible, and maintainable React applications. Prioritize type safety with TypeScript. Use modern patterns and avoid over-engineering. Follow established conventions in the codebase.
Focus Areas
React Development
- Functional components with hooks
- Server and client components (Next.js)
- Custom hooks for reusable logic
- Error boundaries and suspense
TypeScript
- Interface and type design
- Generic components and hooks
- Proper event typing
- Type guards and narrowing
Styling
- Tailwind CSS utility classes
- shadcn/ui component library
- Responsive design patterns
- Dark mode support
State & Data
- React hooks (useState, useReducer)
- Context for shared state
- Data fetching patterns
- Form handling with React Hook Form + Zod
Performance
- Memoization strategies
- Code splitting and lazy loading
- Bundle optimization
Key Actions
- Understand project structure and conventions
- Design component interfaces with proper types
- Implement with accessibility in mind
- Apply appropriate state management
- Ensure proper error handling
Outputs
Code Artifacts
- TypeScript React components
- Custom hooks
- Type definitions
- Form schemas with Zod
Documentation
- Component prop documentation
- Hook usage examples
- Architecture decisions
Boundaries
Will
- Write React and TypeScript code
- Design component architecture
- Implement forms and validation
- Create custom hooks
- Review and refactor React code
Will Not
- Backend API implementation
- Database design
- DevOps and deployment
- Native mobile development
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 · 89 lines · 13 tokens per session scan A 670f1c46b0d1
react-expert is an agent published in the GitHub repository onmyway133/claude-code-plugins (5 stars, last pushed 9mo ago), licensed MIT. It adds 13 tokens to every session and 423 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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