Enforce separation of concerns, dependency inversion, and resilience patterns across layered and distributed architectures. Use when designing new features, evaluating module boundaries, selecting architectural patterns, or resolving scalability bottlenecks. (triggers: architecture, design, system, scalability, microservice, module boundary, coupling)
Build standalone Angular components with Signals inputs, OnPush change detection, Control Flow, and Smart/Dumb patterns. Use when building standalone Angular components, implementing @if/@for control flow, applying OnPush change detection, or implementing Signals in Angular components. (triggers: **/*.component.ts, **/*.component.html, angular component, standalone, input signal, output, @if, @for, ChangeDetectionStrategy, OnPush, Input, Output)
Configure DI, inject() usage, and providers in Angular. Use when configuring Angular dependency injection, using inject(), or defining providers. (triggers: **/*.service.ts, angular inject, providedIn, injection token, provideAppInitializer)
Standards for creating clear, audience-appropriate C4 and UML architecture diagrams with Mermaid. Use when producing system context diagrams, container views, sequence diagrams, or updating ARCHITECTURE.md files. (triggers: ARCHITECTURE.md, **/*.mermaid, **/*.drawio, diagram, architecture, c4, system design, mermaid)
Cross-cutting standards for error design, response shapes, error codes, and boundary placement across API, domain, and infrastructure layers. Use when defining error hierarchies, wrapping exceptions, building standardized error responses, or placing error boundaries in layered architectures. (triggers: **/*.service.ts, **/*.handler.ts, **/*.controller.ts, **/*.go, **/*.java, **/*.kt, **/*.py, error handling, exception, try catch, error boundary, error response, error code, throw)
Enforce separation of concerns, dependency inversion, and resilience patterns across layered and distributed architectures. Use when designing new features, evaluating module boundaries, selecting architectural patterns, or resolving scalability bottlenecks. (triggers: architecture, design, system, scalability, microservice, module boundary, coupling)
Organize Flutter apps with modular feature-based clean architecture. Use when creating or modifying any file under lib/features/ including domain entities, repositories, data sources, or screens. (triggers: lib/features/**, feature, domain, infrastructure, application, presentation)
Compose modern Flutter layouts and widgets idiomatically. Use when composing Flutter widget trees, managing layout constraints, or following idiomatic Flutter patterns. (triggers: lib/presentation/**/*.dart, context.mounted, SizedBox, Gap, composition, shrink)
Enforce inward dependency flow, pure domain layers, and DTO-to-entity mapping in Flutter DDD architecture. Use when structuring lib/domain/, lib/infrastructure/, lib/application/, or lib/presentation/ layers, defining repository interfaces, or wiring BLoCs with get_it. (triggers: lib/domain/**, lib/infrastructure/**, lib/application/**, dto, mapper, Either, Failure)
Structure Go projects with Clean Architecture and standard layout conventions. Use when structuring Go projects or applying Clean Architecture in Go. (triggers: go.mod, internal/**, architecture, structure, folder layout, clean arch, dependency injection)
Apply MVVM, Coordinators, and Clean Architecture (VIP/VIPER) in iOS apps. Use when applying MVVM, Coordinators, or VIP/VIPER architecture in iOS apps. (triggers: **/*ViewModel.swift, **/*Coordinator.swift, **/*ViewController.swift, MVVM, Coordinator, ViewState, Output, Input)
Configure protocol-based DI with property wrappers and Factory/Swinject. Use when setting up dependency injection or factory patterns in iOS. (triggers: **/*.swift, @Injected, Resolver, Container, Swinject, register, resolve)
Apply core Effective Java patterns for robust, maintainable code. Use when applying SOLID principles, choosing between inheritance and composition, refactoring Java code smells, or reviewing class design. (triggers: **/*.java, refactor, SOLID, builder, factory, composition, immutable, Optional, checked exception, clean code)
Implement modern concurrency with Virtual Threads and Structured Concurrency in Java. Use when implementing Java Virtual Threads (Java 21), Structured Concurrency with StructuredTaskScope, CompletableFuture pipelines, or debugging race conditions. (triggers: **/*.java, Thread, Executor, synchronized, lock, CompletableFuture, StructuredTaskScope, VirtualThread, AtomicInteger, async, race condition)
Write safe, structured concurrent code with Kotlin Coroutines. Use when writing suspend functions, choosing coroutine scopes, handling cancellation in loops, selecting between StateFlow and SharedFlow, debugging coroutine leaks, or asked why GlobalScope is dangerous. (triggers: **/*.kt, suspend, CoroutineScope, launch, async, Flow, StateFlow, SharedFlow, viewModelScope, GlobalScope, Dispatchers, isActive, yield, runBlocking)
Enforce core architectural standards for scalable Laravel applications. Use when structuring controllers, service layers, action classes, Form Requests, or Service Container bindings in Laravel projects. (triggers: app/Http/Controllers/**/*.php, routes/*.php, controller, service, action, request, container)
Implement Domain-Driven Design with typed DTOs, repository interfaces, and single-responsibility Action classes in Laravel. Use when creating domain folders, binding repository contracts in providers, or passing DTOs between layers. (triggers: app/Domains/**/*.php, app/Providers/*.php, domain, dto, repository, contract, adapter)
Design decoupled, testable NestJS module boundaries with feature, core, and shared modules. Use when structuring module imports, creating feature modules, or enforcing separation of concerns in NestJS. (triggers: **/*.module.ts, main.ts, NestFactory, Module, Controller, Injectable)
Separate Controllers from Services and build Custom Decorators in NestJS. Use when defining NestJS controllers, services, or custom parameter decorators. (triggers: **/*.controller.ts, **/*.service.ts, Controller, Injectable, ExecutionContext, createParamDecorator)
Structure Next.js projects with Feature-Sliced Design layers, domain-grouped slices, and strict import hierarchy. Use when organizing features into FSD layers, enforcing slice boundaries, or keeping page.tsx thin. (triggers: src/features/**, src/entities/**, src/widgets/**, FSD, Feature Sliced Design, slices, segments)
Structure React Native projects with feature-first organization and separation of concerns. Use when structuring a React Native project or applying clean architecture patterns. (triggers: src/**/*.tsx, src/**/*.ts, app.json, feature, module, directory structure, separation of concerns, Expo, React Navigation, StyleSheet.create, react-native, mobile architecture)
Structure Spring Boot 3+ projects with feature packaging and clean layering. Use when structuring Spring Boot 3 projects, defining layers, or applying architecture patterns. (triggers: pom.xml, build.gradle, structure, layering, dto, controller, @RestController, @Service, @Repository, @Entity, @Bean, @Configuration)
Eliminate component hedging anti-patterns that mask infrastructure failures. Build systems that fail loudly when broken instead of limping along in degraded states. Critical for production reliability and operational visibility.
Implements dbt Mesh governance features (model contracts, access modifiers, groups, versioning) and multi-project collaboration with cross-project refs. Use when implementing dbt Mesh governance, setting up cross-project refs with dependencies.yml, disambiguating similarly-named models across projects, or splitting a monolithic dbt project into multiple mesh projects.
