What is expo-design-system?

A guide for building shared interface components in Expo and React Native apps for web and iOS. It covers reusable design tokens, themes, typography, spacing, component variants, animations, and cross-platform behavior.

It is for creating or reviewing a reusable UI library, including its themes, component APIs, styling rules, and shared React Native building blocks.

It helps teams keep shared components consistent instead of creating slightly different versions in each feature. It also sets clear boundaries for how features use the design system.

expo-design-system — Skill for Claude Code and Codex by pproenca

Install

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.

Any agent

npx skills add pproenca/dot-skills --skill expo-design-system

Clone the repo

git clone --depth 1 https://github.com/pproenca/dot-skills

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/pproenca/dot-skills/expo-design-system/github.svg)](https://agentmods.dev/skills/pproenca/dot-skills/expo-design-system)

Your own site

<a href="https://agentmods.dev/skills/pproenca/dot-skills/expo-design-system"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/expo-design-system/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/pproenca/dot-skills/expo-design-system"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/expo-design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 222 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,296 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found 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	$0.00222	$0.03296
Opus 5	$0.00111	$0.01648
Sonnet 5	$0.00044	$0.00659
Haiku 4.5	$0.00022	$0.00330

Measured 5d ago against content hash f47ec3041f65, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

expo-design-system 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 5d 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.

skills/.experimental/expo-design-system/SKILL.md · 185 lines

How it starts

The opening of the file, as written. The whole thing — 185 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Airbnb DLS Expo React Native Design System Best Practices

Opinionated, strict design system engineering for Expo / React Native apps on the New Architecture, targeting both web and native iOS. Contains 63 rules across 11 categories, prioritized by impact. Derived from Airbnb's Design Language System (DLS), the Unistyles v3 documentation, and the React Native ecosystem (Reanimated, Gesture Handler, Skia, FlashList, Expo SDK). The styling engine is Unistyles v3; the component API follows the Airbnb DLS pattern of variant props over style escape hatches.

Mandated Architecture Alignment

This skill is the infrastructure layer — it teaches how to BUILD the design system itself, the React Native counterpart to ios-design-system. All code examples follow the same non-negotiable constraints:

Feature modules import @clinic/design-system + domain; never another feature's internals
The design system owns the Unistyles theme (tokens, breakpoints) and exports a curated public surface
Reuse before you build: read the index, extend a variant, promote on the second use — never a parallel local component
Components expose variant and slot props (Airbnb DLS); no raw style escape hatch
Animation and gestures run on the UI thread (Reanimated worklets + Gesture Handler)
Lists use FlashList; the body-chart drawing surface uses React Native Skia
One source feels native on both web and iOS: Unistyles _web pseudo-states and Platform splits, never a forked web stylesheet
Targets the New Architecture (Fabric/JSI), Expo SDK 53+ / React Native 0.81+

Scope & Relationship to Sibling Skills

Sibling Skill	Its Focus	This Skill's Focus
`ios-design-system`	The SwiftUI design system for the same clinic app	The Expo / React Native counterpart
`expo-react-native-coder`	Feature development (screens, navigation, data fetching)	Design system infrastructure (tokens, components, theming)
`expo-react-native-performance`	App-wide performance optimization	Native-feel performance inside the design system
`react`	General React patterns	Expo / React Native design system specifics
`expo-ios-hig`	iOS native-feel decisions (navigation, system controls, Liquid Glass)	Cross-platform token/component architecture + web/iOS parity

Read the full file on GitHub · 185 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

5d ago First seen · 185 lines · 222 tokens per session scan A f47ec3041f65

Subscribe to this mod's changes

expo-design-system is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 222 tokens to every session and 3,296 once invoked, about $0.0011 per session on Opus 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.

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