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.
curl -O https://raw.githubusercontent.com/emilyLi2020/WAVE/main/.agents/skills/expo-module/SKILL.mdgit clone --depth 1 https://github.com/emilyLi2020/WAVEWrote 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/emilyli2020/wave/expo-module)<a href="https://agentmods.dev/skills/emilyli2020/wave/expo-module"><img src="https://agentmods.dev/badge/skills/emilyli2020/wave/expo-module/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/emilyli2020/wave/expo-module"><img src="https://agentmods.dev/badge/skills/emilyli2020/wave/expo-module.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00061 | $0.01220 |
| Opus 5.5 | $0.00024 | $0.00488 |
| Sonnet 5.5 | $0.00012 | $0.00244 |
| Haiku 4.5 | $0.00006 | $0.00122 |
Grade A, and why
expo-module 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.
This is a copy
80% identical to expo-module — 16 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.
How it starts
The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Writing Expo Modules
Complete reference for building native modules and views using the Expo Modules API. Covers Swift (iOS), Kotlin (Android), and TypeScript.
When to Use
- Creating a new Expo native module or native view
- Adding native functionality (camera, sensors, system APIs) to an Expo app
- Wrapping platform SDKs for React Native consumption
- Building config plugins that modify native project files
- Adding Android, Apple, or web support to an existing Expo module
- Editing
expo-module.config.json, config plugins, or lifecycle hooks
References
Consult these resources as needed:
references/
create-expo-module.md Scaffolding and add-platform-support workflow, defaults, and quirks
native-module.md Module definition DSL: Name, Function, AsyncFunction, Property, Constant, Events, type system, shared objects
native-view.md Native view components: View, Prop, EventDispatcher, view lifecycle, ref-based functions
lifecycle.md Lifecycle hooks: module, iOS app/AppDelegate, Android activity/application listeners
config-plugin.md Config plugins: modifying Info.plist, AndroidManifest.xml, reading values in native code
module-config.md expo-module.config.json fields, file placement, and autolinking behavior
Quick Start
Prefer create-expo-module over manually creating native module files and directories. In practice, the best path is usually to create the scaffold first and then build on top of it. The scaffold sets up the expected layout, expo-module.config.json, podspec or Gradle files, TypeScript bindings, and the standalone example app flow.
If an existing Expo module only needs another platform, use create-expo-module add-platform-support instead of manually copying native directories.
See references/create-expo-module.md before scaffolding or extending a module. It covers:
- local vs standalone modules
--platform,--features,--barrel,--package-manager, and non-interactive modeexpo.autolinking.nativeModulesDiradd-platform-supportbehavior and quirks
What ships with it
6 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 · 142 lines · 61 tokens per session scan A 384c038bae02
expo-module is a skill published in the GitHub repository emilyLi2020/WAVE (2 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 61 tokens to every session and 1,220 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 80% identical to expo-module, differing in 16 lines, and is treated as a copy.
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