jezweb/claude-skills is a collection of skills, commands, plugins, settings, instructions, and hooks that guide the Claude Code CLI through development tasks and produce outputs such as project scaffolds, assets, documents, or deployed services. It is for developers using Claude Code with technologies and services including Cloudflare, React, Tailwind, Shopify, and WordPress. The catalogue entries are the project's own Claude Code workflow components.
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 jezweb/claude-skills --skill react-patternsgit clone --depth 1 https://github.com/jezweb/claude-skillsWrote 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/jezweb/claude-skills/react-patterns)<a href="https://agentmods.dev/skills/jezweb/claude-skills/react-patterns"><img src="https://agentmods.dev/badge/skills/jezweb/claude-skills/react-patterns/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/skills/jezweb/claude-skills/react-patterns"><img src="https://agentmods.dev/badge/skills/jezweb/claude-skills/react-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 53 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00110 | $0.02304 |
| Opus 5.5 | $0.00044 | $0.00922 |
| Sonnet 5.5 | $0.00022 | $0.00461 |
| Haiku 4.5 | $0.00011 | $0.00230 |
Grade A, and why
react-patterns 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.
How it starts
The opening of the file, as written. The whole thing — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Patterns
Performance and composition patterns for React 19 + Vite + Cloudflare Workers projects. Use as a checklist when writing new components, a review guide when auditing existing code, or a refactoring playbook when something feels slow or tangled.
Rules are ranked by impact. Fix CRITICAL issues before touching MEDIUM ones.
When to Apply
- Writing new React components or pages
- Reviewing code for performance issues
- Refactoring components with too many props or re-renders
- Debugging "why is this slow?" or "why does this re-render?"
- Building reusable component libraries
- Code review before merging
1. Eliminating Waterfalls (CRITICAL)
Sequential async calls where they could be parallel. The #1 performance killer.
| Pattern | Problem | Fix |
|---|---|---|
| Await in sequence | const a = await getA(); const b = await getB(); |
const [a, b] = await Promise.all([getA(), getB()]); |
| Fetch in child | Parent renders, then child fetches, then grandchild fetches | Hoist fetches to the highest common ancestor, pass data down |
| Suspense cascade | Multiple Suspense boundaries that resolve sequentially | One Suspense boundary wrapping all async siblings |
| Await before branch | const data = await fetch(); if (condition) { use(data); } |
Move await inside the branch — don't fetch what you might not use |
| Import then render | const Component = await import('./Heavy'); return <Component /> |
Use React.lazy() + <Suspense> — renders fallback instantly |
How to find them: Search for await in components. Each await is a potential waterfall. If two awaits are independent, they should be parallel.
2. Bundle Size (CRITICAL)
Every KB the user downloads is a KB they wait for.
| Pattern | Problem | Fix |
|---|---|---|
| Barrel imports | import { Button } from '@/components' pulls the entire barrel file |
import { Button } from '@/components/ui/button' — direct import |
| No code splitting | Heavy component loaded on every page | React.lazy(() => import('./HeavyComponent')) + <Suspense> |
| Third-party at load | Analytics/tracking loaded before the app renders | Load after hydration: useEffect(() => { import('./analytics') }, []) |
| Full library import | import _ from 'lodash' (70KB) |
import debounce from 'lodash/debounce' (1KB) |
| Lucide tree-shaking | import * as Icons from 'lucide-react' (all icons) |
Explicit map: import { Home, Settings } from 'lucide-react' |
| Duplicate React | Library bundles its own React → "Cannot read properties of null" | resolve.dedupe: ['react', 'react-dom'] in vite.config.ts |
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 · 141 lines · 110 tokens per session scan A 248d46037c16
react-patterns is a skill published in the GitHub repository jezweb/claude-skills (1,072 stars, last pushed 12d ago), licensed MIT. It adds 110 tokens to every session and 2,304 once invoked, about $0.0004 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 2026-09-03.
Other skills, from other repositories
react-effects-audit
Use when auditing React or Next.js components for unnecessary or unsafe useEffect usage -- detects 9 anti-patterns from "You Might Not Need an Effect".
React Component Reviewer
Analyzes React components for performance, accessibility, and modern hook usage.
react-component-hook-guidelines
Use when reviewing, refactoring, or implementing React components and custom Hooks with unclear boundaries or oversized props.
react-component-hook-guidelines-cn
Guidance for splitting and reviewing React components and custom Hooks, which are reusable functions that manage React logic. It focuses on separating page layout, display, state, requests, and side effects into clearer parts.
react-senior-code-review
Senior-level review of a React feature, by theSeniorDev — structure & boundaries, state & data flow, performance & rendering, types/forms/testability/a11y, and styling architecture & motion. Recommends design patterns by name when one fits. Produces prioritized findings (Critical → Nit) with file:line, why, and a…
review-work
Post-implementation gate review: run manual QA on the real surface yourself, then launch ONE gate reviewer (never a panel) to audit goal, constraints, code quality, security, missed context, and QA evidence. Use before a PR handoff or when the user explicitly asks to review completed work.