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Web search API for LLMs with real-time data access, content extraction, site crawling, and AI-powered research. \n \n Five core methods: search() for web results, extract() for URL content, crawl() for site-wide extraction, map() for URL discovery, and research() for end-to-end AI synthesis \n Supports Python and JavaScript SDKs with async clients for parallel queries and configurable search depth (ultra-fast/fast/basic/advanced) \n Crawl method accepts semantic instructions to focus extraction

Multi-factor authentication with TOTP, OTP, backup codes, and trusted device management for Better Auth. \n \n Supports three verification methods: authenticator apps (TOTP with QR codes), email/SMS codes (OTP), and single-use backup codes \n Handles complete 2FA sign-in flows with automatic session management, temporary 2FA cookies, and trusted device tracking with configurable expiration \n Built-in security features including rate limiting (3 requests per 10 seconds), encryption at rest for s

Apply these security principles when developing backend services, microservices, and any code handling sensitive data or external inputs.

Performance optimization and code style patterns for JavaScript and TypeScript code. Contains 17 rules focused on reducing unnecessary computation, optimizing data structures, and maintaining consistent conventions.

Comprehensive performance optimization guide for React and Next.js applications, maintained by Vercel. Contains 69 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

Guidelines for building scalable, secure, and performant applications on Harper. These practices cover everything from initial schema design to advanced deployment strategies.

Expert guidelines for Matplotlib development, focusing on data visualization, plotting, and creating publication-quality figures.

You are an expert in styled-components, CSS-in-JS patterns, and React component styling.

Comprehensive performance optimization guide for Postgres, maintained by Supabase. Contains rules across 8 categories, prioritized by impact to guide automated query optimization and schema design.

Follows type-first, functional, and error handling patterns from CLAUDE.md. This skill covers language-specific idioms only.