frontend▌

packages/design-tokens/tokens.css:

To access Anthropic's official brand identity and style resources, use this skill.

REST and GraphQL API design with OpenAPI documentation, versioning strategies, and best practices. \n \n Covers REST fundamentals including resource naming, HTTP methods, status codes, request/response formatting, and error handling patterns \n Includes pagination, filtering, sorting, and field selection query parameters with standardized response structures \n Supports multiple authentication approaches: JWT, OAuth 2.0, API keys, and session-based methods \n Provides URL and header-based versio

You are an expert in React Query, TypeScript, and React development. React Query (now TanStack Query) simplifies data fetching logic with built-in caching, background updates, and stale data management.

Validated Flutter forms with field-level error handling and submission workflows. \n \n Requires StatefulWidget hosting with a persistent GlobalKey<FormState> to manage form state and validation across rebuilds \n Use TextFormField widgets with validator() callbacks that return error strings on failure or null on success \n Call _formKey.currentState!.validate() on submit to trigger all validators and automatically display error messages below fields \n Includes complete code example demons

React/Next.js chat UI components for building custom messaging interfaces and AI assistant conversations. \n \n Includes four core components: ChatContainer for layout, ChatMessage for user/assistant/system messages, ChatInput for message submission, and TypingIndicator for loading states \n Supports role-based message variants (user, assistant, system) with automatic alignment and styling \n Built on Tailwind CSS and shadcn/ui design tokens with customizable className props \n Installable via s

The skill is based on Vue 3.5+, generated at 2026-01-28.

Design and optimize SQL and NoSQL database schemas with normalization, indexing, and migration strategies. \n \n Covers entity definition, relationship design (1:1, 1:N, N:M), and normalization levels (1NF–3NF) for PostgreSQL, MySQL, MongoDB, and SQLite \n Provides indexing strategies, constraint setup, and trigger implementation to ensure data integrity and query performance \n Includes migration script generation with UP/DOWN rollback capabilities for safe schema evolution \n Delivers complete

Reduce visual intensity in designs while preserving refinement, sophistication, and functional clarity. \n \n Systematically addresses color saturation, contrast extremes, visual weight, animation excess, and compositional complexity to create calmer, more approachable interfaces \n Requires frontend-design skill context and the Context Gathering Protocol; stops to clarify purpose, audience, and what's working before proceeding \n Guides refinement across five dimensions: color (desaturation, mu

Diagnose and fix SwiftUI performance issues through code review and Instruments profiling guidance. \n \n Classifies symptoms (slow rendering, janky scrolling, CPU spikes, memory growth, hangs, excessive view updates) and performs code-first review against common anti-patterns like invalidation storms, unstable list identity, and layout thrash. \n Guides users through Instruments profiling when code review alone is inconclusive, with structured intake checklists and trace analysis. \n Provides r