Developer Tools & Repos Agent Skills for Codex CLI

Expert guide for Unreal Engine 5.x C++ development, covering UObject hygiene, performance patterns, and best practices.

Kotlin 2.0+ development specialist covering Ktor, coroutines, Compose Multiplatform, and Kotlin-idiomatic patterns.

Mobile accessibility compliance expert for VoiceOver, TalkBack, Dynamic Type, and WCAG mobile guidelines.

Mobile app debugging for iOS, Android, cross-platform frameworks.

Mobile audit — app size, startup time, crash reporting, store compliance, accessibility, offline behavior.

Checkpoint workflow for mobile development safety.

Expert in debugging React Native and Expo mobile applications.

Flutter 3.27+ patterns — Riverpod 2 state with codegen, GoRouter 14+ navigation, Impeller rendering (default on all platforms), WASM web…

Accelerates mobile and desktop app development using React Native, Flutter, Expo, and modern hybrid frameworks.

Offline-first mobile apps with local storage, sync queues, conflict resolution.

Architects cross-platform and native mobile applications, providing guidance on state management, navigation, and platform-specific best…

Mobile push notification expert for FCM, APNs, deep linking, rich notifications, and notification channels.

Mobile reconnaissance — understand the app's tech stack, architecture, dependencies, and health for takeover.

Debugs Modbus RTU and TCP communications for embedded systems through register read/write operations and slave scanning.

Use before repeatedly placing GLB models in PlayCanvas Engine, React, or Web Components to measure each asset once and record its uniform…

This skill should be used when the user asks to "create an MCP App", "add a UI to an MCP tool", "build an interactive MCP View", "scaffold…

Use when writing, reviewing, or modernizing Kotlin code with recent language versions (2.0–2.4.x, including 2.4.10 and 2.4.20-Beta1)…

WHEN building SwiftUI views, managing state, setting up shared services, or making architectural decisions; NOT for UIKit or legacy…

This skill should be used when the GM needs to create NPCs or monsters, generate stat blocks, determine enemy stats, design creatures, or…

Build professional native iPhone apps in Swift with SwiftUI and UIKit.

Use when adding animations with Motion Vue (motion-v) - provides motion component API, gesture animations, scroll-linked effects, layout…