What is expo-app-initialize?

A setup procedure for creating a new Expo React Native mobile app from a tabs template. Expo is a framework and toolchain for building React Native apps, and the procedure configures routing, storage, development builds, and in-app purchases.

Use it to create a new mobile app with Bun, configure the listed Expo packages, run the native prebuild step, and write project instructions.

It removes the repetitive work of starting an app and choosing compatible package versions. It also records the project's commands so later work follows the same setup.

expo-app-initialize — Skill for Claude Code and Codex by richkuo

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 richkuo/rk-skills --skill expo-app-initialize

Clone the repo

git clone --depth 1 https://github.com/richkuo/rk-skills

Made for: Claude Code, Codex.

Or install rk-skills, the plugin that ships this one along with the rest of its 39 skills, 1 command.

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/richkuo/rk-skills/expo-app-initialize/github.svg)](https://agentmods.dev/skills/richkuo/rk-skills/expo-app-initialize)

Your own site

<a href="https://agentmods.dev/skills/richkuo/rk-skills/expo-app-initialize"><img src="https://agentmods.dev/badge/skills/richkuo/rk-skills/expo-app-initialize/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/richkuo/rk-skills/expo-app-initialize"><img src="https://agentmods.dev/badge/skills/richkuo/rk-skills/expo-app-initialize.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,366 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 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	$0.00069	$0.01366
Opus 5.5	$0.00028	$0.00546
Sonnet 5.5	$0.00014	$0.00273
Haiku 4.5	$0.00007	$0.00137

Measured 16d ago against content hash 1ea2f2cda8e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

expo-app-initialize 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 16d 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/expo-app-initialize/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Expo App Initialize

Create a production-ready Expo React Native app from the tabs template and configure it with the standard dependencies. Use Bun for every command. Never use npm, yarn, or npx; use bunx for one-off tools.

Project name: $ARGUMENTS. If that value is empty or starts with a dollar sign (Codex does not replace the placeholder), take the name from the invocation message. If no name was passed, ask the user for a project name before running anything.

Versions

Use the latest version of every package that is compatible with the project. Never copy a version number from memory or from this skill.

Create the project with create-expo@latest, so the app starts on the newest stable Expo SDK.
Before any install, read the project's Expo SDK and React Native versions from package.json. For each package that Expo does not track (react-native-mmkv, react-native-nitro-modules, expo-iap), check the latest published version, its required peer dependencies, and its documented minimum Expo SDK and React Native versions. Choose the newest version that supports the project's React Native version and architecture, and record it with every required peer dependency. If the chosen version is older than the latest, tell the user why.
Install every package with bunx expo install <package>. It selects the version that matches the project's Expo SDK for packages Expo tracks, and the latest version for others. Install the versions and peer dependencies that the check chose in the same command.
After installation, run bunx expo install --check and bunx expo-doctor. Fix every version mismatch they report before prebuild.

Workflow

Run each step in order and wait for it to finish before the next. If a step fails, stop and report the exact error with troubleshooting steps. Never continue after a failed step.

Create the project: bunx create-expo@latest <project-name> --template tabs --yes, then work inside the new directory.
Confirm expo-router is already in package.json. The tabs template includes it. Install it with bunx expo install expo-router only if it is missing.
Check the packages that Expo does not track, as the Versions section describes. Record the chosen version and the required peer dependencies of each package.
Install the dependencies: bunx expo install react-native-mmkv react-native-nitro-modules expo-dev-client expo-iap, plus every required peer dependency that step 3 found. Write a package as <package>@<version> when step 3 chose a version older than the latest.
Run bunx expo install --check and bunx expo-doctor, and fix every version mismatch they report.
Run prebuild as the final setup step: bunx expo prebuild. If the user asked for one platform only, run bunx expo prebuild --platform <android|ios>. On Windows, prebuild skips iOS with a warning; this is expected, so report it and continue.
Write the commands section into CLAUDE.md in the project root. Never overwrite or remove template content, and never add a second # Project Commands section.
- CLAUDE.md exists, as a file or as a symlink to AGENTS.md: append the commands section to it once.
- CLAUDE.md is missing and AGENTS.md exists: create CLAUDE.md with @AGENTS.md as its first line, then the commands section. Do not change AGENTS.md.
- Neither file exists: create CLAUDE.md with the commands section.

Read the full file on GitHub · 81 lines

Files

What ships with it

1 file 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.

agents/openai.yaml 234 B

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.

16d ago First seen · 81 lines · 69 tokens per session scan A 1ea2f2cda8e9

Subscribe to this mod's changes

expo-app-initialize is a skill published in the GitHub repository richkuo/rk-skills (50 stars, last pushed yesterday), licensed MIT. It adds 69 tokens to every session and 1,366 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-10-08.

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