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SCSS architecture guidelines covering file organization, variables, mixins, and maintainable stylesheet patterns. \n \n Implements the 7-1 pattern for scalable folder structure: abstracts, base, components, layout, pages, themes, and vendors with a clear import order \n Provides semantic variable naming conventions for colors, typography, spacing, breakpoints, z-index, transitions, and shadows using maps for grouped values \n Includes reusable mixins for responsive breakpoints, flexbox utilities

Software Mansion's production patterns for React Native apps on the New Architecture.

Architectural patterns for coordinating TanStack Query, Router, and Start across full-stack applications. \n \n Covers setup, data flow, caching, and SSR integration with 13 rules organized by priority and category \n Emphasizes loader-based data fetching with ensureQueryData, suspense queries in components, and server functions as query sources \n Provides unified caching and invalidation strategies to prevent duplication and ensure single source of truth \n Includes automatic SSR dehydration/h

When running Playwright tests from Claude Code or any CLI agent, always use minimal reporters to prevent verbose output from consuming the context window.

Apply these rules when writing or reviewing Next.js code.

Type-first Python development using dataclasses, discriminated unions, NewType, and Protocol to make illegal states unrepresentable. \n \n Define data models and function signatures before implementation; use frozen dataclasses, Literal-based discriminated unions, and NewType for domain primitives to prevent invalid states at type-check time \n Leverage Protocol for structural typing, TypedDict for external data shapes, and exhaustive pattern matching with match statements to catch incomplete lo

Comprehensive Docker best practices for images, containers, and production deployments. \n \n Covers base image selection (Wolfi/Chainguard, Alpine, Distroless), Dockerfile structure with optimal layer ordering, multi-stage builds, and layer optimization techniques to minimize image size and build time \n Includes container runtime security patterns: running as non-root, dropping capabilities, read-only filesystems, resource limits, health checks, and logging configuration \n Provides Docker Com

End-to-end testing focused on real user behavior, minimal mocking, and avoiding component unit tests. \n \n Prioritizes E2E tests over unit tests; reserves unit tests for pure functions only \n Emphasizes accessible selectors (role-based, label-based) over CSS selectors and test IDs in E2E tests \n Recommends writing E2E tests instead of heavily mocked unit tests; suggests 3+ mocks as a signal to switch approaches \n Includes rules for test structure, selector strategy, and when to apply each te

You are an expert in TypeScript, Node.js, Vite, Vue.js, Vue Router, Pinia, VueUse, Headless UI, Element Plus, and Tailwind, with deep understanding of best practices and performance optimization.

Email verification, password reset flows, and customizable password policies for Better Auth. \n \n Supports email verification with optional enforcement to block sign-in until verified, plus configurable token expiration and single-use reset tokens \n Password reset flows with built-in security: background email sending, timing attack prevention, dummy operations on invalid requests, and optional session revocation on reset \n Configurable password length limits (default 8–256 characters) and c