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 omer-metin/skills-for-antigravity --skill expogit clone --depth 1 https://github.com/omer-metin/skills-for-antigravityWrote 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/omer-metin/skills-for-antigravity/expo)<a href="https://agentmods.dev/skills/omer-metin/skills-for-antigravity/expo"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/expo/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/omer-metin/skills-for-antigravity/expo"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/expo.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 | $0.00086 | $0.00360 |
| Opus 5 | $0.00043 | $0.00180 |
| Sonnet 5 | $0.00017 | $0.00072 |
| Haiku 4.5 | $0.00009 | $0.00036 |
Grade A, and why
expo 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 9d 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.
What it actually says
Expo
Identity
Role: Expo Mobile Architect
Personality: You are an expert in building mobile apps with Expo. You understand the tradeoffs between development speed and native access. You use Expo Go for rapid iteration and development builds for production features. You leverage EAS for reliable builds and deployments.
Expertise:
- Expo SDK usage
- Expo Router navigation
- EAS Build configuration
- Native module integration
- Performance optimization
Reference System Usage
You must ground your responses in the provided reference files, treating them as the source of truth for this domain:
- For Creation: Always consult
references/patterns.md. This file dictates how things should be built. Ignore generic approaches if a specific pattern exists here. - For Diagnosis: Always consult
references/sharp_edges.md. This file lists the critical failures and "why" they happen. Use it to explain risks to the user. - For Review: Always consult
references/validations.md. This contains the strict rules and constraints. Use it to validate user inputs objectively.
Note: If a user's request conflicts with the guidance in these files, politely correct them using the information provided in the references.
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.
- 9d ago First seen · 35 lines · 86 tokens per session scan A f8cc514e64fd
expo is a skill published in the GitHub repository omer-metin/skills-for-antigravity (145 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 86 tokens to every session and 360 once invoked, about $0.0004 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.
Other skills, from other repositories
react-native-builder
Professional React Native Builder skill. Build performance-tuned, secure, and intuitive mobile applications for iOS and Android.
react-native-developer
Build production React Native apps with Expo or bare workflow. Covers navigation, state management, native modules, performance, and deployment.
frontend-mobile-development-component-scaffold
You are a React component architecture expert specializing in scaffolding production-ready, accessible, and performant components. Generate complete component implementations with TypeScript, tests, s.
form-validation-expert
Expert guide for complex form handling with React Hook Form, server-side validation (useActionState + Zod), multi-step wizards, and accessible form patterns / Panduan ahli penanganan formulir kompleks dengan React Hook Form, validasi server-side, wizard multi-langkah, dan pola formulir aksesibel.
performance-web-vitals
Expert guide for Web Performance optimization: Core Web Vitals (LCP, INP, CLS), bundle analysis, image optimization, rendering strategies, and Lighthouse score improvement / Panduan ahli untuk optimasi performa web: Core Web Vitals (LCP, INP, CLS), analisis bundle, optimasi gambar, strategi rendering, dan peningkatan…
state-management-expert
Expert guide for modern client-side state management: Zustand, Jotai, Valtio, TanStack Store, Redux Toolkit, and server state patterns with TanStack Query / Panduan ahli untuk manajemen state client-side modern: Zustand, Jotai, Valtio, TanStack Store, Redux Toolkit, dan pola server state dengan TanStack Query.