Agent skill

Expo UI

by pproenca in pproenca/dot-skills

Library reference for @expo/ui SwiftUI components on iOS — covers Host boundaries, modifier composition, iOS 26 Liquid Glass and Human Interface Guidelines composition rules…

MITAuto-check passedMobile

Install Expo UI

skills CLI
$ npx skills add pproenca/dot-skills --skill expo-ui -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install pproenca/dot-skills expo-ui --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/pproenca/dot-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/expo-ui .claude/skills/expo-ui && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
expo-ui
GitHub stars
214
Token cost
~2.7k tokens
SKILL.md length
786 words
Files
60 (incl. references, assets)
Skills in repo
182
Repo updated
First seen
Licence
MIT

At a glance

Library reference for @expo/ui SwiftUI components on iOS — covers Host boundaries, modifier composition, iOS 26 Liquid Glass and Human Interface Guidelines composition rules…

  • Works in 8 steps: Setup & Host Boundaries (CRITICAL) → iOS 26 HIG Composition Rules (CRITICAL) → Modifiers System (CRITICAL) → …
  • Reviewing React Native code that imports from @expo/ui/swift-ui
  • SKILL.md covers When to Apply, When NOT to Use This Skill, Rule Categories by Priority and Quick Reference, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Expo UI is an agent skill from pproenca/dot-skills. Library reference for @expo/ui SwiftUI components on iOS — covers Host boundaries, modifier composition, iOS 26 Liquid Glass and Human Interface Guidelines composition rules, layout/input/navigation/display catalogues, and ObservableState patterns. Use this skill whenever writing or reviewing React Native code that imports from @expo/ui/swift-ui or @expo/ui/swift-ui/modifiers — including new Expo apps adopting native SwiftUI views, migrations from React Native primitives to expo-ui, and code targeting iOS 26…

Its SKILL.md is about 2.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 62 other files, including reference files and assets (for example `AGENTS.md`, `README.md` and `assets/templates/_template.md`).

It sits in Mobile, covering Cross-platform mobile apps and iOS development. It works with Expo, SwiftUI, iOS and React Native. The repository describes itself as: A collection of AI agent skills following the Agent Skills open format. The licence is MIT.

When your agent uses it

  • Reviewing React Native code that imports from @expo/ui/swift-ui
  • @expo/ui/swift-ui/modifiers — including new Expo apps adopting native SwiftUI views
  • Migrations from React Native primitives to expo-ui
  • Code targeting iOS 26 features (Liquid Glass

Example prompts

  • “expo-ui”
  • “/expo-ui”

Workflow steps

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

  1. Setup & Host Boundaries (CRITICAL)
  2. iOS 26 HIG Composition Rules (CRITICAL)
  3. Modifiers System (CRITICAL)
  4. Layout Components (HIGH)
  5. Input & Controls (HIGH)
  6. Navigation & Overlays (HIGH)
  7. Display & Feedback (MEDIUM-HIGH)
  8. State & Cross-Cutting Patterns (MEDIUM)

What it can do on your machine

Read from SKILL.md and the folder at commit cf93c57. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

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

  • Network

    No URLs in SKILL.md.

    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 2.7k tokens when it runs, and up to ~28k if it reads all its reference files. Until then it costs about 180 tokens; SKILL.md has 786 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~180
When it runs · the whole SKILL.md, loaded when a task matches
~2.7k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~28k

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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 pproenca/dot-skills at commit cf93c57, republished under its MIT licence (© pproenca). 786 words, ~2,663 tokens.

Download SKILL.mdSave it as .claude/skills/expo-ui/SKILL.md (or your agent's skills folder). This skill also uses 59 other files; get the full folder from GitHub.
name
expo-ui
description
Library reference for @expo/ui SwiftUI components on iOS — covers Host boundaries, modifier composition, iOS 26 Liquid Glass and Human Interface Guidelines composition rules, layout/input/navigation/display catalogues, and ObservableState patterns. Use this skill whenever writing or reviewing React Native code that imports from @expo/ui/swift-ui or @expo/ui/swift-ui/modifiers — including new Expo apps adopting native SwiftUI views, migrations from React Native primitives to expo-ui, and code targeting iOS 26 features (Liquid Glass, GlassEffectContainer, sheet detents). Trigger even if the user does not explicitly mention "expo-ui" but is writing iOS-targeted Expo UI code that should bridge to SwiftUI.

Expo @expo/ui SwiftUI Best Practices

Library reference for @expo/ui/swift-ui and @expo/ui/swift-ui/modifiers — the iOS surface of Expo's native UI bridge. Contains 53 rules across 8 categories, prioritised by cascade impact for agents building Expo apps that render to native SwiftUI views on iOS 26 and earlier.

When to Apply

Reference these guidelines when:

  • Building a new screen with @expo/ui/swift-ui — pick the right container (Form vs List vs ScrollView), wrap in Host correctly, apply modifiers
  • Migrating from React Native primitives (View, Text, TouchableOpacity) to native SwiftUI components
  • Targeting iOS 26 features — Liquid Glass material, GlassEffectContainer, new sheet detent behaviours
  • Reviewing code that imports from @expo/ui/swift-ui or @expo/ui/swift-ui/modifiers
  • Debugging "the SwiftUI view doesn't render / is the wrong size / ignores styles" — usually a Host or modifier issue
  • Composing presentation surfaces — Alert, ConfirmationDialog, BottomSheet, Popover — under HIG modality guidance
  • Writing controlled inputs (TextField, Toggle, Picker, Slider) with useNativeState and worklet writes

When NOT to Use This Skill

  • Android Jetpack Compose — this skill covers iOS SwiftUI only. The @expo/ui/jetpack-compose surface has its own conventions
  • Universal (cross-platform) components — @expo/ui exposes a small set; this skill scopes to the platform-specific iOS surface
  • Navigation routing — for stack/tab routing, use expo-router and expo-router/unstable-native-tabs; this skill covers UI composition only
  • Pre-iOS-17 fallbacks — most rules assume iOS 17 minimum; Liquid Glass rules require iOS 26

Rule Categories by Priority

PriorityCategoryImpactPrefix
1Setup & Host BoundariesCRITICALhost-
2iOS 26 HIG Composition RulesCRITICALhig-
3Modifiers SystemCRITICALmod-
4Layout ComponentsHIGHlayout-
5Input & ControlsHIGHinput-
6Navigation & OverlaysHIGHnav-
7Display & FeedbackMEDIUM-HIGHdisplay-
8State & Cross-Cutting PatternsMEDIUMstate-

Quick Reference

1. Setup & Host Boundaries (CRITICAL)
2. iOS 26 HIG Composition Rules (CRITICAL)
3. Modifiers System (CRITICAL)
4. Layout Components (HIGH)
Show full SKILL.md (310 more words)Show less
5. Input & Controls (HIGH)
6. Navigation & Overlays (HIGH)
7. Display & Feedback (MEDIUM-HIGH)
8. State & Cross-Cutting Patterns (MEDIUM)

How to Use

Read individual reference files for detailed explanations and code examples:

Each rule file contains:

  • Brief explanation of why it matters in the SwiftUI bridge
  • Incorrect code example anchored to a realistic domain
  • Correct code example with a minimal diff from the incorrect one
  • Where relevant: Alternative approach, When NOT to use, Warning callouts, authoritative reference URL

Gotchas

See gotchas.md — append entries as failure points surface during real use.

  • For Android Jetpack Compose components, the parallel skill would target @expo/ui/jetpack-compose
  • For navigation routing (stack, tabs), use expo-router directly
  • For form validation libraries, see the react-hook-form skill

© pproenca, 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 59 other files (references, assets) in skills/.curated/expo-ui of pproenca/dot-skills.

  • SKILL.md
  • AGENTS.md
  • README.md
  • assets/templates/_template.md
  • gotchas.md
  • metadata.json
  • references/_sections.md
  • references/display-chart-data-points.md
  • references/display-gauge-current-value-label.md
  • references/display-image-system-name.md
  • references/display-label-icon-vs-title.md
  • references/display-progress-indeterminate.md
  • references/display-text-markdown.md
  • references/hig-confirmation-dialog-destructive.md
  • references/hig-glass-effect-container.md
  • references/hig-no-glass-on-glass.md
  • references/hig-no-stacked-modals.md
  • references/hig-popover-iphone-fallback.md
  • … and 42 more

Open the folder on GitHubat commit cf93c57

Compare with similar skills

Expo UI next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Expo UI compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Expo UI this skillpproenca/dot-skills214—~2.7kAutomated safety check: PassMIT
Expo UIarcboxlabs/linkcode155—~1.2kAutomated safety check: PassMIT
Mobile Devcallstackincubator/codex-mobile-dev-plugin138—~5.5kAutomated safety check: PassNone
Expo Brownfieldexpo/skills2.7k—~1.4kAutomated safety check: PassMIT
Expo Brownfield Integrationmweinbach/agent-coworker1562 repos~900Automated safety check: NotesCustom licence
Mobile Nativeleepokai/Codync1861 repos~4.2kAutomated safety check: PassMIT

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Categories

Questions about Expo UI

What does Expo UI do?

Library reference for @expo/ui SwiftUI components on iOS — covers Host boundaries, modifier composition, iOS 26 Liquid Glass and Human Interface Guidelines composition rules…. Expo UI is an agent skill from pproenca/dot-skills. Library reference for @expo/ui SwiftUI components on iOS — covers Host boundaries, modifier composition, iOS 26 Liquid Glass and Human Interface Guidelines composition rules, layout/input/navigation/display catalogues, and ObservableState patterns.

When should I use Expo UI?

Expo UI fits situations like: reviewing React Native code that imports from @expo/ui/swift-ui; @expo/ui/swift-ui/modifiers — including new Expo apps adopting native SwiftUI views; migrations from React Native primitives to expo-ui; code targeting iOS 26 features (Liquid Glass.

How do I install Expo UI in Claude Code?

Run `npx skills add pproenca/dot-skills --skill expo-ui -a claude-code`. Or copy the skill folder (skills/.curated/expo-ui in pproenca/dot-skills) into .claude/skills/expo-ui in your project. Claude Code loads it when a task matches its description.

How do I install Expo UI in Codex?

Run `npx skills add pproenca/dot-skills --skill expo-ui -a codex`. Or copy the skill folder (skills/.curated/expo-ui in pproenca/dot-skills) into .agents/skills/expo-ui in your project. Codex loads it when a task matches its description.

Can I use Expo UI in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add pproenca/dot-skills --skill expo-ui -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/expo-ui, .gemini/skills/expo-ui, .github/skills/expo-ui and .opencode/skills/expo-ui in your project.

What does Expo UI need to run?

SKILL.md names no scripts, command-line tools or credentials: Expo UI is instructions for the agent only.

Does Expo UI access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Expo UI safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Expo UI use?

Expo UI is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Expo UI use?

About 2.7k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 25k tokens, read only when the agent opens those files.

What are the alternatives to Expo UI?

Skills that share tags, products or a category with Expo UI: Expo UI (arcboxlabs/linkcode, 155 stars), Mobile Dev (callstackincubator/codex-mobile-dev-plugin, 138 stars), Expo Brownfield (expo/skills, 2.7k stars) and Expo Brownfield Integration (mweinbach/agent-coworker, 156 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Expo UI?

pproenca (a GitHub user) maintains it in pproenca/dot-skills, which has 214 GitHub stars. The repository holds 182 skills in this directory. The repository was last updated on August 15, 2026.

Source: pproenca/dot-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.