Mobile

Strict test-driven development state machine with red-green-refactor cycles. Enforces test-first development, meaningful failures, minimum implementations, and full verification. Activates when user requests: 'use a TDD approach', 'start TDD', 'test-drive this'.

Master SQL query optimization, indexing strategies, and EXPLAIN analysis for Supabase/PostgreSQL to dramatically improve database performance. Includes PostGIS spatial optimization, RLS performance, and Supabase-specific patterns. Use when debugging slow queries, designing database schemas, optimizing RPC functions, or improving application performance.

Comprehensive Flutter development guidance covering widget composition (including ADHD-friendly UI patterns), state management (Bloc and Riverpod), navigation with go_router, platform-specific code for iOS/Android/Web/Desktop, Material Design 3 implementation, and performance optimization. Use when building Flutter applications, implementing state management, creating cross-platform features, optimizing performance, or designing accessible user interfaces.

Setup monitoring and observability for applications with Sentry, PostHog, Pino logging, and OpenTelemetry. Use when users need error tracking, product analytics, structured logging, metrics, or centralized exception handling. Covers AdonisJS-inspired error patterns.

This skill should be used when the user asks to "implement with TDD", "write tests first", "do test-driven development", or as Phase 5 of the /dev workflow. Enforces RED-GREEN-REFACTOR cycle with mandatory test-first approach.

Apply structured thinking before coding. Use when: starting new features, making architectural decisions, refactoring large components, or evaluating implementation approaches. Includes Musk's 5-step algorithm and ICE scoring framework.

Expert knowledge in Flutter Riverpod state management (2025 best practices). Use when working with Riverpod, Flutter state management, AsyncNotifier, provider types, code generation with riverpod_generator, state synchronization, or when the user mentions data fetching, mutations, reactive state, performance optimization, or testing in Flutter apps. Covers AsyncNotifierProvider patterns, repository architecture, autoDispose, family providers, and common anti-patterns to avoid.

Scan a file for UX improvement opportunities and implement smooth, elegant animations with TDD methodology. Creates polished, professional user experiences reminiscent of Apple's design philosophy. Works file-by-file, creating reusable animation patterns.

Automatically applies when working with database migrations. Ensures proper Alembic patterns, upgrade/downgrade scripts, data migrations, rollback safety, and migration testing.

OAuth flows for user-context operations. Web application patterns, device flow for CLI tools, and token refresh strategies for GitHub Apps.

Lightweight search utility for Toss / Apps-in-Toss llms-full.txt docs, caching sources and ranking snippets with keyword + similarity (Korean-aware) scoring.

Automated code review using external AI tools (codex and/or gemini-cli). Use this skill after writing or editing code to get a second opinion from other AI models, then implement their recommendations with user approval.

iOS (Swift, SwiftUI), Android (Kotlin, Compose), cross-platform (Flutter, React Native), and game development (Unity, Unreal). Master mobile and games.

Generate Cypress E2E test files and configuration for web application testing. Triggers on "create cypress test", "generate cypress config", "e2e test for", "cypress setup".

This skill should be used after productive sessions to extract learnings and route them to appropriate Reusable Intelligence Infrastructure (RII) components. Use when corrections were made, format drift was fixed, new patterns emerged, or the user explicitly asks to "harvest learnings" or "capture session intelligence". Transforms one-time fixes into permanent organizational knowledge by implementing updates across multiple files.

Implement robust error handling with user-friendly messages, specific exception types, centralized error boundaries, and graceful degradation strategies. Use this skill when writing try-catch blocks, handling exceptions and errors, creating error messages for users, implementing error boundaries in React or other frameworks, validating input and checking preconditions, handling API errors and external service failures, implementing retry strategies with exponential backoff, cleaning up resources in finally blocks, designing graceful degradation for non-critical failures, or preventing technical details and security information from being exposed to users. Apply this skill when handling errors in any code file, implementing error recovery mechanisms, or reviewing error handling approaches for robustness and security.

Apply SQL optimization patterns including index usage, query rewriting, JOIN optimization, and window functions. Use when improving query performance or analyzing slow queries.This skill provides comprehensive SQL optimization patterns and best practices:- N+1 query elimination- Index optimization strategies- JOIN vs subquery performance- Window functions for complex aggregations- Query execution plan analysisTriggers: "optimize SQL", "slow query", "improve performance", "SQL最適化", "クエリ改善", "パフォーマンス向上"

Teaches generic constraints, avoiding any in generic defaults, and mapped types in TypeScript. Use when creating reusable functions, components, or types that work with multiple types while maintaining type safety.

Mac App Store申請前のチェックリスト。Sandbox必須、スクリーンショット、Notarization、権限説明を確認。Use when: Mac App Store、macOS申請、Mac審査 を依頼された時。

Your approach to handling global version control. Use this skill when working on files where global version control comes into play.