What is Expo UI SwiftUI?

A package integration for using Apple's SwiftUI interface components in an Expo app. Expo is a framework for building mobile apps with JavaScript, while SwiftUI is Apple's system for describing iPhone and iPad screens.

Use it to add SwiftUI-based layouts and controls to an Expo app, including places where React Native components need to appear inside a SwiftUI layout.

It lets an Expo app use SwiftUI views and modifiers while documenting the required SDK version, imports, and native rebuild step.

How emilyLi2020/WAVE configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to emilyLi2020/WAVE. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/emilyLi2020/WAVE/main/.agents/skills/expo-ui-swiftui/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/emilyLi2020/WAVE

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/emilyli2020/wave/expo-ui-swiftui/github.svg)](https://agentmods.dev/skills/emilyli2020/wave/expo-ui-swiftui)

Your own site

<a href="https://agentmods.dev/skills/emilyli2020/wave/expo-ui-swiftui"><img src="https://agentmods.dev/badge/skills/emilyli2020/wave/expo-ui-swiftui/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/emilyli2020/wave/expo-ui-swiftui"><img src="https://agentmods.dev/badge/skills/emilyli2020/wave/expo-ui-swiftui.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 407 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 98% copy Near-identical to another mod in the catalogue.

Token cost

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	$0.00026	$0.00407
Opus 5	$0.00013	$0.00204
Sonnet 5	$0.00005	$0.00081
Haiku 4.5	$0.00003	$0.00041

Measured 10d ago against content hash fa3dd55b08d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

Expo UI SwiftUI 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 10d 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.

Origin

This is a copy

98% identical to expo-ui-swift-ui — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/expo-ui-swiftui/SKILL.md · 40 lines

What it actually says

The instructions in this skill apply to SDK 55 only. For other SDK versions, refer to the Expo UI SwiftUI docs for that version for the most accurate information.

Installation

npx expo install @expo/ui

A native rebuild is required after installation (npx expo run:ios).

Instructions

Expo UI's API mirrors SwiftUI's API. Use SwiftUI knowledge to decide which components or modifiers to use.
Components are imported from @expo/ui/swift-ui, modifiers from @expo/ui/swift-ui/modifiers.
When about to use a component, fetch its docs to confirm the API - https://docs.expo.dev/versions/v55.0.0/sdk/ui/swift-ui/{component-name}/index.md
When unsure about a modifier's API, refer to the docs - https://docs.expo.dev/versions/v55.0.0/sdk/ui/swift-ui/modifiers/index.md
Every SwiftUI tree must be wrapped in Host.
RNHostView is specifically for embedding RN components inside a SwiftUI tree. Example:

import { Host, VStack, RNHostView } from "@expo-ui/swift-ui";
import { Pressable } from "react-native";

<Host matchContents>
  <VStack>
    <RNHostView matchContents>
      // Here, `Pressable` is an RN component so it is wrapped in `RNHostView`.
      <Pressable />
    </RNHostView>
  </VStack>
</Host>;

If a required modifier or View is missing in Expo UI, it can be extended via a local Expo module. See: https://docs.expo.dev/guides/expo-ui-swift-ui/extending/index.md. Confirm with the user before extending.

Changes

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.

10d ago First seen · 40 lines · 26 tokens per session scan A fa3dd55b08d4

Subscribe to this mod's changes

Expo UI SwiftUI is a skill published in the GitHub repository emilyLi2020/WAVE (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 26 tokens to every session and 407 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to expo-ui-swift-ui, differing in 4 lines, and is treated as a copy.

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WAVE: Skill for Claude Code