Design

Use when styling React Native components with StyleSheet, Flexbox layout, responsive design, and theming. Covers platform-specific styling and design systems.

Use when oTP actor patterns in Gleam including processes, message passing, GenServer implementations, supervisors, fault tolerance, state management, and building concurrent, fault-tolerant applications on the Erlang VM.

Use when deciding between inheritance and composition in object-oriented design. Use when creating class hierarchies or composing objects from smaller components.

Use when next.js Server Components for optimal performance. Use when building data-intensive Next.js applications.

Use when nestJS testing with unit tests, integration tests, and e2e tests. Use when building well-tested NestJS applications.

Use automatically during development workflows when making claims about tests, builds, verification, or code quality requiring concrete evidence to ensure trust through transparency.

Use when Elixir OTP patterns including GenServer, Supervisor, Agent, and Task. Use when building concurrent, fault-tolerant Elixir applications.

Use when Java concurrency with ExecutorService, CompletableFuture, and virtual threads. Use when building concurrent applications.

Multi-agent parallel investigation for complex JUCE problems. Use when troubleshooting fails after Level 3, problems require novel research, or user requests /research command.

Use when Django ORM patterns with models, queries, and relationships. Use when building database-driven Django applications.

Use when kotlin coroutines for structured concurrency including suspend functions, coroutine builders, Flow, channels, and patterns for building efficient asynchronous code with cancellation and exception handling.

Use when building or integrating native modules in React Native. Covers creating native modules, Turbo Modules, bridging native code, and accessing platform-specific APIs.

Use when next.js data fetching patterns including SSG, SSR, and ISR. Use when building data-driven Next.js applications.

Use when building Android UIs with Jetpack Compose, managing state with remember/mutableStateOf, or implementing declarative UI patterns.

Use when erlang's concurrency model including lightweight processes, message passing, process links and monitors, error handling patterns, selective receive, and building massively concurrent systems on the BEAM VM.

Use when hotwire (Turbo and Stimulus) for building modern reactive Rails applications without complex JavaScript frameworks.

Use when building and deploying Expo apps with EAS Build. Covers build configuration, development builds, production builds, and app store submission.

Use when managing state and side effects in Ink applications using React hooks for terminal UIs.

Use when responding to questions or providing information requiring professional honesty and directness over excessive agreeableness.

Use when writing SOPs that require precise requirement levels using RFC 2119 constraint keywords (MUST, SHOULD, MAY). Covers proper usage of requirement keywords for deterministic agent behavior.