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 JansenAnalytics/claudex --skill react-frontendgit clone --depth 1 https://github.com/JansenAnalytics/claudexWrote 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/jansenanalytics/claudex/react-frontend)<a href="https://agentmods.dev/skills/jansenanalytics/claudex/react-frontend"><img src="https://agentmods.dev/badge/skills/jansenanalytics/claudex/react-frontend.svg" alt="Measured on agentmods" 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 | $0.00050 | $0.06709 |
| Opus 5 | $0.00025 | $0.03354 |
| Sonnet 5 | $0.00010 | $0.01342 |
| Haiku 4.5 | $0.00005 | $0.00671 |
Grade A, and why
react-frontend scanned grade A with 1 finding 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 3d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
const promise = fetch(url, { How it starts
The opening of the file, as written. The whole thing — 837 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Frontend Skill
Opinionated guide for building data-heavy React applications — dashboards, trading UIs, analytics tools. Based on the 2025/2026 React ecosystem and our actual stack (React 19 + Vite + TypeScript + Tailwind).
Companion skill: Use with frontend-design for aesthetics guidance.
Our Stack
This is what we use and what this skill optimizes for:
| Layer | Choice | Why |
|---|---|---|
| Framework | React 19 + Vite 7 (SPA) | Fast dev, no SSR needed for dashboards |
| Language | TypeScript (strict) | Non-negotiable for data-heavy apps |
| Styling | Tailwind CSS 4 | Utility-first, consistent, fast iteration |
| Routing | React Router 7 | Mature, well-known, sufficient for SPAs |
| Charts | Lightweight Charts (TradingView) | Best for financial/OHLCV data |
| Build | Vite + vite preview for prod |
Fast HMR, good tree-shaking |
When NOT to use this stack
- Need SSR/SEO: Use Next.js instead
- Need server components: Use Next.js App Router
- Simple marketing site: Use Astro
- Mobile app: Use React Native (different skill)
Project Structure
src/
├── App.tsx # Root component, router setup
├── main.tsx # Entry point
├── types/ # Shared TypeScript types
│ ├── index.ts # Re-exports
│ └── market.ts # Domain-specific types
├── hooks/ # Custom hooks (data fetching, subscriptions)
│ ├── useApi.ts # Generic API fetcher
│ ├── useBchUsd.ts # Domain-specific data hook
│ └── useSubscription.ts # WebSocket/SSE subscriptions
├── context/ # React Context providers (sparingly)
│ ├── CurrencyContext.tsx
│ └── ThemeContext.tsx
├── components/
│ ├── shared/ # Reusable UI primitives
│ │ ├── Card.tsx
│ │ ├── Table.tsx
│ │ ├── LoadingSpinner.tsx
│ │ └── ErrorBoundary.tsx
│ ├── layout/ # App shell, navigation
│ │ ├── AppLayout.tsx
│ │ ├── Sidebar.tsx
│ │ └── TopNav.tsx
│ ├── dashboard/ # Feature: main dashboard
│ │ ├── AnalyticsDashboard.tsx
│ │ ├── PriceChart.tsx
│ │ ├── StatsPanel.tsx
│ │ └── TokenSelector.tsx
│ ├── market/ # Feature: market overview
│ │ ├── MarketDashboard.tsx
│ │ ├── CorrelationMatrix.tsx
│ │ └── HeatmapView.tsx
│ └── chain/ # Feature: chain analytics
│ ├── ChainDashboard.tsx
│ └── TraderGrowthChart.tsx
├── lib/ # Pure utility functions (no React)
│ ├── api.ts # API client
│ ├── formatters.ts # Number/date formatting
│ └── colors.ts # Color scales for charts
└── assets/ # Static files
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.
- 3d ago First seen · 837 lines · 50 tokens per session scan A df0f37712f84
react-frontend is a skill published in the GitHub repository JansenAnalytics/claudex (5 stars, last pushed 2mo ago), licensed MIT. It adds 50 tokens to every session and 6,709 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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