React Native

What it does

When your agent uses it

• Reviewing React Native code
• Tasks that involve Cross-platform mobile apps

Example prompts

• “react native”
• “mobile app”
• “react native performance”
• “/react-native”

Requirements

• Node.js
• Compatibility (from SKILL.md): claude-code-only
• Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash

Workflow steps

8 steps, taken from the step headings in SKILL.md.

1. 1List Performance (CRITICAL)
2. 2Animations (HIGH)
3. 3Navigation (HIGH)
4. 4UI Patterns (HIGH)
5. 5Images and Media (MEDIUM)
6. 6State and Data (MEDIUM)
7. 7Expo Workflow (MEDIUM)
8. 8Testing (LOW-MEDIUM)

What it can do on your machine

Read from SKILL.md and the folder at commit 64965d9. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Read
  • Write
  • Edit
  • Glob
  • Grep
  • Bash

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npx
  • eas

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  claude-code-only

  From compatibility in the SKILL.md frontmatter.

Context cost

React Native loads about 2.4k tokens when it runs. Until then it costs about 109 tokens; SKILL.md has 843 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~109

When it runs · the whole SKILL.md, loaded when a task matches

~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Read, Write, Edit, Glob, Grep, Bash

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jezweb/claude-skills at commit 64965d9, republished under its MIT licence (© jezweb). 843 words, ~2,360 tokens.

name

react-native

description

React Native and Expo patterns for building performant mobile apps. Covers list performance, animations with Reanimated, navigation, UI patterns, state management, platform-specific code, and Expo workflows. Use when building or reviewing React Native code. Triggers: 'react native', 'expo', 'mobile app', 'react native performance', 'flatlist', 'reanimated', 'expo router', 'mobile development', 'ios app', 'android app'.

allowed-tools

Read, Write, Edit, Glob, Grep, Bash

compatibility

claude-code-only

<FlatList
  data={items}
  keyExtractor={(item) => item.id}
  renderItem={renderItem}           // Memoised component
  getItemLayout={getItemLayout}     // If items are fixed height
  initialNumToRender={10}           // Don't render 100 items on mount
  maxToRenderPerBatch={10}          // Batch size for off-screen rendering
  windowSize={5}                    // How many screens to keep in memory
  removeClippedSubviews={true}      // Unmount off-screen items (Android)
/>

import Animated, { useSharedValue, useAnimatedStyle, withSpring } from 'react-native-reanimated';

function AnimatedBox() {
  const offset = useSharedValue(0);
  const style = useAnimatedStyle(() => ({
    transform: [{ translateX: withSpring(offset.value) }],
  }));

  return (
    <GestureDetector gesture={panGesture}>
      <Animated.View style={[styles.box, style]} />
    </GestureDetector>
  );
}

app/
├── _layout.tsx          # Root layout (tab navigator)
├── index.tsx            # Home tab
├── (tabs)/
│   ├── _layout.tsx      # Tab bar config
│   ├── home.tsx
│   ├── search.tsx
│   └── profile.tsx
├── [id].tsx             # Dynamic route
└── modal.tsx            # Modal route

npx create-expo-app my-app --template tabs
cd my-app
npx expo install expo-image react-native-reanimated react-native-gesture-handler react-native-safe-area-context

© jezweb, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in plugins/frontend/skills/react-native of jezweb/claude-skills.

Open the folder on GitHubat commit 64965d9