> browse/registry

> java-best-practices

Core engineering principles inspired by Effective Java and Clean Code. Use when applying Effective Java patterns, SOLID principles, or clean code practices in Java. (triggers: **/*.java, refactor, clean code, smells, patterns, design)

> database-mongodb

Expert rules for schema design, indexing, and performance in MongoDB. Use when designing MongoDB schemas, creating indexes, or optimizing NoSQL query performance. (triggers: **/*.ts, **/*.js, **/*.json, mongo, mongoose, objectid, schema, model)

> ios-notifications

Push notifications for iOS using UserNotifications framework and APNS. Use when integrating APNS push notifications in iOS applications. (triggers: **/*Notification*.swift, **/*AppDelegate.swift, UNUserNotificationCenter, APNS, UNNotificationRequest, deviceToken)

> nextjs-architecture

Scalable project structure using Feature-Sliced Design (FSD). Use when structuring a Next.js project with Feature-Sliced Design architecture. (triggers: src/features/**, src/entities/**, src/widgets/**, FSD, Feature Sliced Design, slices, segments)

> swift-error-handling

Standards for Throwing Functions, Result Type, and Never. Use when implementing Swift error throwing, Result<T,E>, or designing error hierarchies. (triggers: **/*.swift, throws, try, catch, Result, Error)

> angular-state-management

Signals-based state management and NgRx Signal Store. Use when managing application state with Angular Signals or NgRx Signal Store. (triggers: **/*.store.ts, **/state/**, angular signals, signal store, computed, effect)

> android-navigation

Navigation for Android using Jetpack Compose Navigation and App Links. Use when implementing navigation flows, deep links, or backstack handling in Android. (triggers: **/*Screen.kt, **/*Activity.kt, **/NavGraph.kt, NavController, NavHost, composable, navArgument, deepLinks)

> common-mobile-ux-core

Universal mobile UX principles for touch-first interfaces. Enforces touch targets, safe areas, and mobile-specific interaction patterns. (triggers: **/*_page.dart, **/*_screen.dart, **/*_view.dart, **/*.swift, **/*Activity.kt, **/*Screen.tsx, mobile, responsive, SafeArea, touch, gesture, viewport)

> Code Review Expert

Standards for high-quality, persona-driven code reviews. Use when reviewing PRs, critiquing code quality, or analyzing changes for team feedback.

> android-design-system

Enforce Material Design 3 and design token usage in Jetpack Compose apps. Use when implementing M3 components, color schemes, or design tokens in Android. (triggers: **/*Screen.kt, **/ui/theme/**, **/compose/**, MaterialTheme, Color, Typography, Modifier, Composable)

> nestjs-architecture

Standards for scalable, modular NestJS backend architecture. Use when designing module boundaries, feature modules, or scalable NestJS architecture. (triggers: **/*.module.ts, main.ts, NestFactory, Module, Controller, Injectable)

> common-protocol-enforcement

Standards for Red-Team verification and adversarial protocol audit. Use when verifying tasks, performing self-scans, or checking for protocol violations. (triggers: **/*, verify, complete, check, audit, scan, retrospective)

> golang-architecture

Standards for structural design, Clean Architecture, and project layout in Golang. Use when structuring Go projects or applying Clean Architecture in Go. (triggers: go.mod, internal/**, architecture, structure, folder layout, clean arch, dependency injection)

> ios-navigation

SwiftUI navigation and deep linking using NavigationStack and Universal Links. Use when implementing NavigationStack or Universal Links deep linking in iOS. (triggers: **/*View.swift, **/*App.swift, NavigationStack, NavigationLink, onOpenURL, universalLink, NSUserActivity)

> common-architecture-diagramming

Standards for creating clear, effective, and formalized software architecture diagrams (C4, UML). (triggers: ARCHITECTURE.md, **/*.mermaid, **/*.drawio, diagram, architecture, c4, system design, mermaid)

> laravel-api

REST and JSON API standards for modern Laravel backends. Use when designing REST endpoints, API resources, or JSON API responses in Laravel. (triggers: routes/api.php, app/Http/Resources/**/*.php, resource, collection, sanctum, passport, cors)

> nextjs-styling

Zero-runtime CSS strategies (Tailwind) and RSC compatibility. Use when implementing Tailwind CSS or zero-runtime styling compatible with React Server Components. (triggers: **/*.css, tailwind.config.ts, **/components/ui/*.tsx, tailwind, css modules, styled-components, clsx, cn)

> common-mobile-animation

Motion design principles for mobile apps. Covers timing curves, transitions, gestures, and performance-conscious animations. (triggers: **/*_page.dart, **/*_screen.dart, **/*.swift, **/*Activity.kt, **/*Screen.tsx, Animation, AnimationController, Animated, MotionLayout, transition, gesture)

> common-performance-engineering

Universal standards for high-performance development. Use when optimizing, reducing latency, fixing memory leaks, profiling, or improving throughput. (triggers: **/*.ts, **/*.tsx, **/*.go, **/*.dart, **/*.java, **/*.kt, **/*.swift, **/*.py, performance, optimize, profile, scalability, latency, throughput, memory leak, bottleneck)

> System Design & Architecture Standards

Universal architectural standards for robust, scalable systems. Use when designing new features, evaluating architecture, or resolving scalability concerns.