Web & Frontend

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Set up a new Inertia Rails project or add Inertia to an existing Rails application. Use when creating new projects, configuring Inertia, or setting up the development environment with React, Vue, or Svelte. Use when this capability is needed.

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Expert in Next.js 14/15 App Router architecture, React Server Components (RSC), Server Actions, and modern full-stack React development. Specializes in routing patterns, data fetching strategies, Use when this capability is needed.

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Complete guide for the SE104_VLEAGUE React frontend — pages, services, components, auth flow, i18n, and patterns Use when this capability is needed.

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Implement proper Next.js 16 Image component usage with configuration for remote domains, responsive images, and breaking changes from previous versions Use when this capability is needed.

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Next.js PR workflow with quality checks (lint/build/test), semantic versioning labels (major/minor/patch), coverage badges, and JIRA integration via pr-creation-workflow framework Use when this capability is needed.

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Architects token systems with primitive, semantic, and component layers. Use when structuring tokens from scratch, adding multi-theme support, setting up token aliasing, or organizing token hierarchies. Use when this capability is needed.

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Launch and use the local BackgroundComputerUse macOS runtime through its self-documenting loopback API. Use when Codex needs to control local macOS apps or windows, inspect screenshots and Accessibility state, click/type/scroll/press keys, use the visible cursor, or help install/start the BackgroundComputerUse API from a skill. Use when this capability is needed.

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Write and debug React Native Harness tests for app code. Use when the user asks to create or fix tests that import from react-native-harness, mock modules, spy on functions, render React Native components on-device, use setupFiles or setupFilesAfterEnv, or add optional UI tests with @react-native-harness/ui. Use when this capability is needed.

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Plan and execute backend and frontend Dependabot remediation with wave-based sequencing, resolver validation, and post-merge closure checks. Use when this capability is needed.

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Previne, diagnostica e prova ausencia de overflow de layout em Flutter/Dart - barras listradas de RenderFlex e seus primos (unbounded constraints, form empurrado pelo teclado, texto que nao cabe). Use ao construir, revisar ou debugar UI Flutter com Row, Column, ListView/GridView, Form, dialog ou layout responsivo, e sempre que mencionarem overflow, estourou ou estourando o layout, RenderFlex, pixels overflowed, bottom/right overflowed, layout quebrando, tela cortada, unbounded height/width, texto cortado ou teclado cobrindo o botao. Cobre Expanded/Flexible/Wrap/SingleChildScrollView/FittedBox, tabela sintoma-correcao, scanner heuristico de risco e harness de widget-test multi-device, com checklist sub-atomico (multi-size, textScaler, RTL, dark mode, SafeArea, teclado) e principios cross-stack (CSS, React Native, SwiftUI, Compose). Use when this capability is needed.

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Generate Leaf templates for FOSMVVM WebApps. Create full-page views and HTML-over-the-wire fragments that render ViewModels. Use when this capability is needed.

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Accessibility testing for web applications using Playwright (@playwright/test) with TypeScript and axe-core. Use when asked to write, run, or debug automated accessibility checks, keyboard navigation tests, focus management, ARIA/semantic validations, screen reader compatibility, or WCAG 2.1 Level AA compliance testing. Covers axe-core integration, POUR principles (perceivable, operable, understandable, robust), color contrast, form labels, landmarks, and accessible names. Use when this capability is needed.

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Expert guidance for creating modern, intuitive, and visually stunning user interfaces. Use this skill when designing or implementing frontend UIs, components, layout structures, or styling. Use when this capability is needed.

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Guides implementation of Next.js 15 App Router features with Supabase SSR. Helps choose between Server/Client Components, select correct Supabase client, and follow security patterns. Use when building pages, components, or API routes. Use when this capability is needed.

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Storybook guidelines for React including story structure, interaction tests with play functions, and Testing Library queries. Auto-loaded when working with story files. Use when this capability is needed.

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Quick Reference

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Tailwind CSS debugging and troubleshooting guide for common issues and solutions Use when this capability is needed.

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Django Verification Loop

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Generate Edge Delivery Services-compliant HTML from authoring analysis. Creates section structure, applies block tables, handles metadata, and manages images folder. Use when this capability is needed.

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Optimize React apps for 60fps performance. Implements memoization, virtualization, code splitting, bundle optimization. Use for slow renders, large lists, bundle bloat. Activate on "React performance", Use when this capability is needed.

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Activation Criteria

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Validates that Storybook mock data structures match component TypeScript prop types. Compares JSON/JS mock data files against component interfaces to ensure correct types, required fields, and data structures. Use when creating new stories, updating component props, debugging rendering issues, or ensuring mock data accuracy.

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Colyseus client SDK for React, connection methods, room events, and messaging. Use when connecting to multiplayer server. Use when this capability is needed.

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Comprehensive JWT authentication expert for senior developers (10+ years experience). Intelligently detects project language/framework and implements production-ready JWT auth systems with refresh tokens, secure HTTP-only cookies, token rotation, blacklisting, RBAC, MFA, and complete security. Covers Express, FastAPI, Next.js, React, Django, Flask, NestJS, and more. Automatically audits JWT implementations, generates complete auth systems (registration, login, logout, refresh, password reset), implements middleware, prevents XSS/CSRF attacks, uses bcrypt/argon2 hashing, and follows OWASP best practices. Use for implementing JWT authentication, token refresh flows, secure cookie storage, protected routes, role-based access control, security audits, and complete auth system generation. Use when this capability is needed.

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MUST invoke before creating or editing any Angular component's tests (spec file). Enforces the Page Object Model pattern – tests drive components through the rendered DOM (their public contract) rather than reaching into component internals. Use when this capability is needed.

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ReAct pattern implementation, reflection and self-correction, planning Use when this capability is needed.

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Automatically validates frontend design patterns to prevent generic aesthetics (Inter fonts, purple gradients, minimal animations) and enforce distinctive, branded design during Tanstack Start (React) development with shadcn/ui Use when this capability is needed.

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Comprehensive performance optimization agent that provides expert guidance on profiling, frontend optimization (Core Web Vitals), backend optimization, caching strategies, and performance monitoring. Covers browser rendering, network optimization, database tuning, memory management, and load testing. Use for performance audits, optimization initiatives, or establishing performance budgets. Use when this capability is needed.

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Reusable React/JavaScript patterns for Somali dialect classifier dashboard. Covers Chart.js integration, data card components, filter patterns, responsive layouts, and dashboard-specific UI patterns. Auto-invokes when building dashboard components, charts, data visualizations, or dashboard UI. Use when this capability is needed.

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Tailwind CSS plugins including official plugins and custom plugin development Use when this capability is needed.

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Use when a task needs Expo / React Native mobile work — navigation, native modules, performance, EAS builds, or store deployment.

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Idiomatic TypeScript development. Use when writing TypeScript code, Node.js services, React apps, or discussing TS patterns. Emphasizes strict typing, composition, and modern tooling (bun/vite). Use when this capability is needed.

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Quick Reference

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Use this agent when reviewing code changes to ensure features are agent-native - any action a user can take, an agent can also take, and anything a user can see, an agent can see. Triggers on requests like "agent-native review", "AI accessibility check".

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Guide de développement React Native avec Expo et navigation. Se déclenche avec "React Native", "Expo", "RN", "react-navigation", "native modules", "bridge", "mobile JavaScript", "Hermes". Use when this capability is needed.

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Comprehensive Next.js, React, Redux, and TypeScript development guidelines covering SOLID principles, component architecture, and best practices. Use when this capability is needed.