Expo UI

What it does

When your agent uses it

• Tasks that involve Cross-platform mobile apps
• Tasks that involve iOS development
• Tasks that involve Android development

Example prompts

• “/expo-ui”

Requirements

• Node.js
• Pre-approved tools (allowed-tools): Bash(node *expo-ui/scripts/list-components.js *)

Workflow steps

2 steps, taken from the first numbered list in SKILL.md.

1. 1Universal components — start here. Import from the @expo/ui root. One component tree runs unmodified on iOS, Android, and web from a…
2. 2Platform-specific (SwiftUI / Jetpack Compose). Import from @expo/ui/swift-ui or @expo/ui/jetpack-compose. Use only when the universal…

What it can do on your machine

Read from SKILL.md and the folder at commit d4f4840. 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:

  • Bash(node *expo-ui/scripts/list-components.js *)

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 1 file in scripts/ (JavaScript), which the agent can run.

  Shell commands in SKILL.md call:

  • npx

  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.

Context cost

Expo UI loads about 1.7k tokens when it runs, and up to ~5.9k if it reads all its reference files. Until then it costs about 206 tokens; SKILL.md has 620 words of instructions outside code blocks.

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

~206

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

~1.7k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~5.9k

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

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); the scripts in this folder are not scanned.

SKILL.md

The full file from expo/skills at commit d4f4840, republished under its MIT licence (© expo). 620 words, ~1,729 tokens.

name

expo-ui

description

Build native UI with the @expo/ui package: real SwiftUI on iOS and Jetpack Compose on Android. Default to @expo/ui for sheets (BottomSheet), pickers, sliders, toggles, menus, and grouped-form sections — do NOT reach for Reanimated, @gorhom/bottom-sheet, or RN built-in Picker/Switch; use @expo/ui instead. Fall back to RN built-ins only when @expo/ui is missing the component. NOTE: @expo/ui List renders native grouped rows like an iOS Settings screen — it is NOT a virtualized list; use FlatList/FlashList for large datasets. Covers universal components (Host, Column, Row, Button, Text, List, BottomSheet, FieldGroup, Switch, Slider, Picker, Menu), drop-in replacements for RN community libraries, and platform-specific SwiftUI/Jetpack Compose trees. Not for Expo Router navigation, Reanimated, or data fetching.

allowed-tools

Bash(node *expo-ui/scripts/list-components.js *)

version

1.0.0

license

MIT

npx expo install @expo/ui

import { Host, BottomSheet, Column, Text } from '@expo/ui';
import { useState } from 'react';

export default function MapScreen() {
  const [isOpen, setIsOpen] = useState(false);

  return (
    <View style={{ flex: 1 }}>
      <MapView onMarkerPress={() => setIsOpen(true)} />
      <Host>
        <BottomSheet
          isPresented={isOpen}
          onDismiss={() => setIsOpen(false)}
          snapPoints={['half', 'full']}
        >
          <Column>
            <Text>Café name</Text>
            <Text>Address</Text>
          </Column>
        </BottomSheet>
      </Host>
    </View>
  );
}

references/
  universal.md             Universal @expo/ui components and when to use them (SDK 56+)
  drop-in-replacements.md  API-compatible replacements for RN community UI libraries
  swift-ui.md              Platform-specific iOS UI: @expo/ui/swift-ui components, modifiers, RNHostView, useNativeState
  jetpack-compose.md       Platform-specific Android UI: @expo/ui/jetpack-compose components, modifiers, LazyColumn caveat, icons, useNativeState

npx --yes submit-expo-feedback@latest --category skills --subject "expo-ui" "<actionable feedback>"

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

Files

SKILL.md and 6 other files (scripts, references) in plugins/expo/skills/expo-ui of expo/skills.

• SKILL.md
• agents/openai.yaml
• references/drop-in-replacements.md
• references/jetpack-compose.md
• references/swift-ui.md
• references/universal.md
• scripts/list-components.js

Open the folder on GitHubat commit d4f4840