rtl-internationalization
Right-to-left (RTL) layout and bidirectional text support for Hebrew, Arabic, Persian, and Urdu interfaces. Use when building UI that must support RTL languages, converting physical CSS/Tailwind properties to logical ones, handling mixed-direction (bidi) text, mirroring directional icons, or testing an app with dir=\"rtl\".
ruby-rails
Conventions and best practices for building web applications with Ruby on Rails. Use when scaffolding Rails apps or generators, designing ActiveRecord models and migrations, wiring up Hotwire/Turbo/Stimulus interactivity, setting up background jobs or caching, or writing RSpec/Minitest coverage for Rails code.
ruby
Ruby development guidelines covering idiomatic code style, Ruby 3.x features, testing with RSpec, and best practices for building maintainable Ruby applications.
rust
Expert in Rust development with focus on safety, performance, and async programming
salesforce-development
Expert guidance for Salesforce development including Apex, Lightning Web Components, and metadata best practices
salesforce-dx
Expert guidance for Salesforce DX development with modern tooling, source-driven development, and CI/CD best practices
sanity
Sanity CMS development guidelines for schema creation, GROQ queries, TypeScript integration, and project organization
sass-best-practices
Sass (indented syntax) best practices and coding guidelines for clean, maintainable stylesheets
scikit-learn-best-practices
Best practices for scikit-learn machine learning, model development, evaluation, and deployment in Python
scipy-best-practices
Best practices for SciPy scientific computing, optimization, signal processing, and statistical analysis in Python
scrapy-web-scraping
Expert guidance for building web scrapers and crawlers using the Scrapy Python framework with best practices for spider development, data extraction, and pipeline management.
scss-best-practices
SCSS/Sassy CSS best practices and coding guidelines for maintainable, scalable stylesheets
security-devsecops
DevSecOps, secure software development lifecycle (SSDLC), and application security (AppSec) practices covering secret handling, input validation, dependency hygiene, authentication/authorization, and CI/CD security tooling (SAST, SCA, DAST, secret scanning, IaC scanning). Use when writing code that handles credentials, user input, database queries, or authentication, when setting up a CI/CD pipeline, or when reviewing code or infrastructure for security issues.
selenium-automation
Expert guidance for browser automation and web testing using Selenium WebDriver with best practices for element location, waits, and test organization.
seo-best-practices
Apply SEO best practices for web applications including metadata, performance optimization, and search engine optimization techniques.
sequelize
Guidelines for developing with Sequelize, a promise-based Node.js ORM supporting PostgreSQL, MySQL, MariaDB, SQLite, and SQL Server
serverless
Serverless and microservices development guidelines covering FastAPI, cloud-native patterns, API gateways, and best practices for scalable serverless architectures.
shopify-theme-development-guidelines
Expert Shopify theme development with Liquid, Online Store 2.0, and performance best practices
shopify
Expert Shopify theme development guidelines for Liquid, Online Store 2.0, CSS, JavaScript, and UX best practices
snowflake-cortex-ai
Reference for Snowflake Cortex AI Functions (AI_COMPLETE, AI_CLASSIFY, AI_EXTRACT, AI_FILTER, etc.) and Cortex Search for building RAG applications entirely inside Snowflake. Use when writing SQL that calls an LLM, classifying or extracting structured data from text, building a natural-language WHERE filter, or setting up hybrid vector+keyword search for retrieval-augmented generation.
snowflake-data-engineering
Best practices for Snowflake SQL, semi-structured data, and data pipelines built with Dynamic Tables, Streams, Tasks, and Snowpipe. Use when writing Snowflake SQL, designing ingestion or transformation pipelines, tuning warehouse performance and cost, or working with Time Travel, cloning, RBAC, or Iceberg tables on Snowflake.
snowflake-snowpark-dbt
Best practices for Snowpark Python (DataFrames, UDFs, UDTFs, stored procedures) and dbt with the dbt-snowflake adapter. Use when writing server-side Snowpark pipelines, registering UDFs or stored procedures, choosing dbt materializations, configuring incremental models, or setting up sources and tests for a Snowflake-backed dbt project.
solana
Expert guidelines for Solana program development with Rust, Anchor framework, and Web3.js integration
solidity
Best practices for secure, gas-efficient Solidity smart contract development and Web3 frontend integration. Use when writing or reviewing Solidity contracts, hardening against reentrancy and access-control bugs, optimizing gas usage, setting up Hardhat/Foundry testing and static analysis, or wiring a React frontend to wallets, providers, and on-chain transactions.
spring-boot
Expert guidance for Spring Boot application development with best practices for RESTful APIs, testing, security, and deployment
spring-framework
Expert guidance for Spring Framework and Spring Boot development with Java best practices, dependency injection, and RESTful API design
sql-best-practices
SQL development best practices for writing efficient, secure, and maintainable database queries
storybook
Best practices for building and documenting component libraries with Storybook
stripe
Stripe payment integration guidelines for TypeScript, React, Next.js with secure payment processing and subscription management
styled-components-best-practices
styled-components best practices for CSS-in-JS development in React applications
supabase-development
Supabase development guidelines for database, authentication, real-time subscriptions, and Edge Functions.
supabase
Expert in Supabase backend development with authentication and database patterns
svelte
Modern Svelte 5 and SvelteKit development covering runes-based reactivity, snippets, SSR/SSG, and state management, including migration notes from legacy Svelte 4 syntax. Use when writing or reviewing Svelte components, deciding between runes and legacy reactive statements, building SvelteKit routes and load functions, or migrating a Svelte 4 codebase to Svelte 5.
sveltekit
Expert guidance for SvelteKit development with TypeScript, Tailwind CSS, SSR/SSG, and performance optimization best practices
swift
Expert in Swift and SwiftUI development for iOS, macOS, and Apple platforms
swiftui-development
Guidelines for building SwiftUI applications with MVVM/Clean Architecture, Swift 6 strict concurrency, and modern state management. Use when building SwiftUI views, structuring view models, managing state with @State/@Observable, handling async data flow, or optimizing SwiftUI view performance.
swr
Guidelines for using SWR (stale-while-revalidate) React Hooks for efficient data fetching, caching, and revalidation
tailwindcss
Expert in TailwindCSS utility-first styling with responsive design patterns
tanstack-query
Best practices for TanStack Query v5 (React Query) server state management, including query key factories, the queryOptions helper, mutations, optimistic updates, infinite queries, and Suspense mode. Use when fetching or caching server data in React, writing custom query/mutation hooks, setting up a QueryClient, implementing optimistic updates, or migrating v4 patterns to v5.
tanstack-router
Type-safe, file-based routing for React with TanStack Router. Use when defining routes with createFileRoute, validating search params with Zod, writing route loaders, setting up auth guards with beforeLoad, integrating TanStack Query into loaders, or configuring router context and preloading.
tanstack-start
Best practices for TanStack Start, the full-stack React framework built on TanStack Router and Vite/Nitro. Use when building server functions with createServerFn, setting up SSR and streaming with defer()/Await, writing API routes, configuring app.config.ts, or deploying a TanStack Start app to Node, Vercel, Netlify, Bun, or Cloudflare.
tauri-development
Tauri development guidelines for building cross-platform desktop applications with TypeScript, Rust, and modern web technologies
technical-writing
Expert technical writing guidelines for creating clear, in-depth developer tutorials and documentation with practical, implementable knowledge
tensorflow-deep-learning
Best practices for building, training, evaluating, and deploying neural networks with TensorFlow and Keras. Use when writing tf.data input pipelines, defining or training a Keras model, configuring callbacks for checkpointing and early stopping, evaluating a trained model, or exporting a model for serving.
terraform
Expert in Terraform infrastructure-as-code with cloud deployment patterns
testing
General testing best practices and guidelines for writing comprehensive, maintainable tests across different testing frameworks and languages.
three-js
Expert guidance for Three.js and React Three Fiber development with modern React, TypeScript, and performance best practices
transformers-huggingface
Expert guidance for working with Hugging Face Transformers library for NLP, computer vision, and multimodal AI tasks.
trpc
Guidelines for writing Next.js apps with tRPC v11 for end-to-end typesafe APIs
turbopack-bundler
Best practices and guidelines for Turbopack, the Rust-powered incremental bundler for Next.js and modern web development
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