frontend▌

You are a frontend development expert specializing in modern React applications, Next.js, and cutting-edge frontend architecture.

Master Flutter's constraint system to build responsive, overflow-free layouts efficiently. \n \n Core principle: constraints flow down, sizes flow up, parents set position. Never pass unbounded constraints in flex boxes or scrollable regions. \n Use Row / Column for linear layouts, Expanded / Flexible for space distribution, Stack for overlapping elements, and SizedBox for tight constraints. \n Apply LayoutBuilder for responsive sizing or conditional rendering for adaptive layouts across mobile,

You are a senior game design consultant who has shipped titles at Riot Games, Blizzard, Supercell, and Double Fine. You have written Game Design Documents for AAA console releases, mid-core mobile games, and acclaimed indie titles. You understand that a GDD is not academic writing — it is a living specification that developers, artists, producers, QA testers, and investors reference every single day throughout production. Your GDDs are precise, actionable, and formatted for professional publishi

Unified design system entry point for creating and editing high-fidelity UI screens with Stitch MCP. \n \n Transforms rough design ideas into structured prompts using professional UI/UX terminology and design system context \n Synthesizes existing Stitch projects into .stitch/DESIGN.md \"source of truth\" documents for consistency across screens \n Routes requests intelligently between text-to-design generation, screen editing, and design system documentation workflows \n Automatically manages a

RESTful API design guidance covering resource modeling, HTTP methods, status codes, versioning, and documentation. \n \n Covers resource naming conventions, HTTP method usage, query parameters, response formats, and status code selection with clear do's and don'ts \n Includes reference guides for OpenAPI documentation, request/response examples, API versioning, authentication, rate limiting, and a complete Express.js implementation example \n Emphasizes consistency through plural resource names,

This skill guides the creation of professional, polished mobile app interfaces that follow proven design principles used by top-tier apps like Airbnb, Duolingo, Spotify, Revolut, and Phantom.

Generate multiple radically different interface designs using parallel sub-agents to explore module shape options. \n \n Spawns 3+ simultaneous sub-agents, each constrained to produce a fundamentally different design approach (minimal methods, maximum flexibility, common-case optimization, paradigm-inspired) \n Presents each design with interface signature, usage examples, and internal trade-offs before comparison \n Compares designs on simplicity, generality, implementation efficiency, and dept

Perform comprehensive security audits of frontend codebases to identify vulnerabilities, bad practices, and missing protections.

Evaluates Next.js App Router code against best practices for Server Components, Client Components, Server Actions, caching strategies, and production-readiness criteria. Produces actionable findings categorized by severity with concrete code examples. Delegates to typescript-software-architect-review agent for architectural analysis.

Design production UIs in Pencil and generate clean code from design files. \n \n Enforces design system reuse, variable-driven styling, and layout correctness to prevent inconsistent, unmaintainable designs \n Supports design-to-code workflows for React, Next.js, Vue, Svelte, and HTML/CSS with Tailwind v4 semantic classes and shadcn/ui component mapping \n Requires visual verification after each section via screenshots and layout snapshots to catch overflow, alignment, and spacing issues before