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 agentmods add skills/callstackincubator/agent-skills/create-react-native-librarynpx skills add callstackincubator/agent-skills --skill create-react-native-librarygit clone --depth 1 https://github.com/callstackincubator/agent-skillsWhat 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 | $0.00044 | $0.00529 |
| Opus 5 | $0.00022 | $0.00264 |
| Sonnet 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 2d 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.
- 2d 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 (1,633 stars, last pushed 25d ago), licensed MIT. It adds 44 tokens to every session and 529 once invoked, about $0.0002 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 2026-08-30.
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