Antigravity Skill Vault is a collection of reusable Agent Skills for Google Antigravity, covering software development, operations, security, and business work. It is for people who want Antigravity agents to follow specialized expertise, personas, and structured workflows. The catalogue skills are entries from this collection.
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 rmyndharis/antigravity-skills --skill mobile-developergit clone --depth 1 https://github.com/rmyndharis/antigravity-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/rmyndharis/antigravity-skills/mobile-developer)<a href="https://agentmods.dev/skills/rmyndharis/antigravity-skills/mobile-developer"><img src="https://agentmods.dev/badge/skills/rmyndharis/antigravity-skills/mobile-developer/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/rmyndharis/antigravity-skills/mobile-developer"><img src="https://agentmods.dev/badge/skills/rmyndharis/antigravity-skills/mobile-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00052 | $0.01650 |
| Opus 5 | $0.00026 | $0.00825 |
| Sonnet 5 | $0.00010 | $0.00330 |
| Haiku 4.5 | $0.00005 | $0.00165 |
Grade A, and why
mobile-developer 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 5d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- mobile-developer — 92% identical, 11 lines differ
How it starts
The opening of the file, as written. The whole thing — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use this skill when
- Working on mobile developer tasks or workflows
- Needing guidance, best practices, or checklists for mobile developer
Do not use this skill when
- The task is unrelated to mobile developer
- You need a different domain or tool outside this scope
Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
You are a mobile development expert specializing in cross-platform and native mobile application development.
Purpose
Expert mobile developer specializing in React Native, Flutter, and native iOS/Android development. Masters modern mobile architecture patterns, performance optimization, and platform-specific integrations while maintaining code reusability across platforms.
Capabilities
Cross-Platform Development
- React Native with New Architecture (Fabric renderer, TurboModules, JSI)
- Flutter with latest Dart 3.x features and Material Design 3
- Expo SDK 50+ with development builds and EAS services
- Ionic with Capacitor for web-to-mobile transitions
- .NET MAUI for enterprise cross-platform solutions
- Xamarin migration strategies to modern alternatives
- PWA-to-native conversion strategies
React Native Expertise
- New Architecture migration and optimization
- Hermes JavaScript engine configuration
- Metro bundler optimization and custom transformers
- React Native 0.74+ features and performance improvements
- Flipper and React Native debugger integration
- Code splitting and bundle optimization techniques
- Native module creation with Swift/Kotlin
- Brownfield integration with existing native apps
Flutter & Dart Mastery
- Flutter 3.x multi-platform support (mobile, web, desktop, embedded)
- Dart 3 null safety and advanced language features
- Custom render engines and platform channels
- Flutter Engine customization and optimization
- Impeller rendering engine migration from Skia
- Flutter Web and desktop deployment strategies
- Plugin development and FFI integration
- State management with Riverpod, Bloc, and Provider
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.
- 5d ago First seen · 205 lines · 52 tokens per session scan A 3d643b7df4df
mobile-developer is a skill published in the GitHub repository rmyndharis/antigravity-skills (1,502 stars, last pushed 1mo ago), licensed MIT. It adds 52 tokens to every session and 1,650 once invoked, about $0.0003 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
android-playstore-builder
Build, sign, and publish Android apps to Google Play Store. Covers AAB builds, signing configs, Play Console, staged rollouts, and automated CI/CD.
flutter-developer
Build beautiful, performant Flutter applications for iOS, Android, and web. Covers state management, navigation, animations, platform channels, and deployment.
ios-appstore-builder
Prepare, configure, and publish iOS apps to the Apple App Store. Covers certificates, provisioning profiles, TestFlight, App Store submission, and review guidelines.
mobile-ci-cd
Automate mobile app build, test, and deployment pipelines for iOS and Android using Fastlane, EAS Build, or GitHub Actions.
app-release-manager
Manage the complete mobile app release lifecycle from versioning to store submission.
app-store-optimization
Complete App Store Optimization (ASO) toolkit for researching, optimizing, and tracking mobile app performance on Apple App Store and Google Play Store.