Callstack Agent Skills is a collection of instructions that gives AI coding assistants practical knowledge for building React Native applications. Developers use it for app development, performance, navigation, testing, CI, device automation, and migrations to React Native. The catalogue entries are the project's skills, rules, and instructions for compatible coding assistants.
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.
npx skills add callstackincubator/agent-skills --skill create-react-native-librarygit clone --depth 1 https://github.com/callstackincubator/agent-skillsWrote 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.
[](https://agentmods.dev/skills/callstackincubator/agent-skills/create-react-native-library)<a href="https://agentmods.dev/skills/callstackincubator/agent-skills/create-react-native-library"><img src="https://agentmods.dev/badge/skills/callstackincubator/agent-skills/create-react-native-library/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.
<a href="https://agentmods.dev/skills/callstackincubator/agent-skills/create-react-native-library"><img src="https://agentmods.dev/badge/skills/callstackincubator/agent-skills/create-react-native-library.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 36 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 39 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 49 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00044 | $0.00529 |
| Opus 5.5 | $0.00018 | $0.00212 |
| Sonnet 5.5 | $0.00009 | $0.00106 |
| Haiku 4.5 | $0.00004 | $0.00053 |
Grade A, and why
create-react-native-library 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create React Native Library
Overview
Use this skill to scaffold a standalone React Native library or a local library inside an existing app, then continue with the correct implementation docs.
Examples:
- JS-only library that may use other React Native libraries
- Native modules that expose native functionality to JavaScript
- Native UI components that render native views in React Native
Choose one flow first:
- Use [scaffold-library.md][scaffold-library] when creating a new library that may be published to npm
- Use [local-library.md][local-library] when exposing native functionality in a React Native app
When to Apply
Use this skill when:
- Creating or working on a React Native library with
create-react-native-library - Creating a native module or view in an existing app
- Wrapping native SDKs and exposing them to React Native
Quick Reference
# Inspect current options before scaffolding
npx create-react-native-library@latest --help
# Scaffold a library with turbo modules and the Expo example app
npx create-react-native-library@latest awesome-library \
--no-interactive \
--yes \
--description "A brief description of the library" \
--type turbo-module \
--languages kotlin-objc \
--example expo
# Scaffold a local Turbo Module inside an existing app
cd MyApp
npx create-react-native-library@latest awesome-library \
--local \
--no-interactive \
--yes \
--description "A brief description of the library" \
--type turbo-module \
--languages kotlin-objc
References
| File | Description |
|---|---|
| [scaffold-library.md][scaffold-library] | Scaffold a new library and default to the Expo example |
| [local-library.md][local-library] | Add a local library to an existing app with autolinking |
Problem -> Skill Mapping
| Problem | Start With |
|---|---|
| Need a new library scaffold | [scaffold-library][scaffold-library] |
| Need to add a local native library to an app | [local-library][local-library] |
What ships with it
3 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.
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.
- 1mo ago First seen · 74 lines · 44 tokens per session scan A 72fc31f0dbf0
create-react-native-library is a skill published in the GitHub repository callstackincubator/agent-skills (1,673 stars, last pushed 9d ago), licensed MIT. It adds 44 tokens to every session and 529 once invoked, about $0.0002 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 2026-08-30.
Other skills, from other repositories
react-native-testing
Write tests using React Native Testing Library (RNTL) v13 and v14 (@testing-library/react-native). Use when writing, reviewing, or fixing React Native component tests. Covers: render, screen, queries (getBy/getAllBy/queryBy/findBy), Jest matchers, userEvent, fireEvent, waitFor, and async patterns. Supports v13 (React…
expo-native-ui
Build beautiful, native-feeling Expo screens. Covers Apple HIG styling, semantic colors, native controls, SF Symbols, media, visual effects, gradients, storage, and responsive layout. For routing and navigation, use the expo-router skill; for motion and animation, use the expo-animation skill.
expo-brownfield
Integrate Expo and React Native into an existing native iOS or Android app. Use for brownfield, embedding a React Native screen in SwiftUI/UIKit or Kotlin, or AAR/XCFramework packaging. Covers isolated and integrated approaches. For building or distributing a purely native app with EAS, use eas-app-stores.
truesheet-usage
Consumer-side guide for integrating @lodev09/react-native-true-sheet into a React Native app. Use this skill whenever the user wants to add, configure, control, or debug a bottom sheet using TrueSheet — including ref-based sheets, named global sheets, web support with TrueSheetProvider/useTrueSheet, React Navigation…
taro-ui-guide
Guides installation, Taro config, styling, and usage of taro-ui (At components) for WeChat/Alipay/H5/RN. Use when building Taro apps with taro-ui, picking components, theming, i18n, or modifying packages/taro-ui source.
react-native-ease-refactor
Scan for Animated/Reanimated code and migrate to EaseView.