Coding standards, frameworks, refactoring, and code review (18K skills)
Use practical server-side patterns for Node.js, Express, and Next.js APIs. Get guidance on API structure, database queries, caching, authentication, error handling, rate limits, and background jobs when building maintainable services.
Use this example as a template for a project-specific skill that helps an agent work within a particular application. It demonstrates how to document architecture, file layout, coding patterns, testing expectations, and deployment steps for consistent project work.
Run formatters and linters after each file edit, then delegate remaining violations to a Claude subprocess for repair and verification. The hooks also protect linter configuration files and support several languages and file formats.
Use this skill to design or review REST APIs, including resource URLs, HTTP methods and status codes, pagination, filtering, errors, versioning, and rate limits. It helps make endpoint behavior and response formats consistent for clients and developers.
Use this skill to make practical PostgreSQL choices for queries, schema design, indexes, row-level security, and connection settings. It provides quick reference patterns and SQL checks for slow queries, missing foreign-key indexes, and table bloat.
Use these Python patterns when writing, reviewing, or refactoring code. The guide explains readable idioms, type hints, error handling, resource management, generators, concurrency, package structure, and common anti-patterns to help shape maintainable applications.
Plan safer database schema and data changes for PostgreSQL, MySQL, and common migration tools. The skill covers reversible migrations, large-table backfills, rollback planning, and staged deployment patterns that help avoid downtime in production systems.
Help multi-agent workflows find the codebase context a subagent needs. Start with a broad search, judge which files are relevant, identify missing information, and refine the search for up to three cycles to keep the returned context focused.
Use this skill to structure Django applications and design Django REST Framework APIs. It covers models, serializers, viewsets, service layers, caching, signals, middleware, and ORM practices such as avoiding N+1 queries and using bulk operations.
Use this skill to structure Java Spring Boot backends, from REST controllers and service layers to Spring Data access. It offers examples for validation, error handling, caching, asynchronous work, logging, pagination, retries, rate limiting, and production configuration.
Use this skill to write or review Java 17+ code for Spring Boot services. It gives practical conventions for naming, immutability, Optional, streams, exceptions, generics, and project structure, with maintainability and clear intent as priorities.
Learn patterns for adding Apple’s FoundationModels to iOS 26+ apps. Generate text, return typed data with `@Generable`, let the model call custom tools, and stream partial results to the UI, while checking model availability and respecting the stated context limit.
Apply practical patterns for React and Next.js interfaces, covering component composition, state management, data fetching, forms, accessibility, and performance techniques such as memoization, lazy loading, and list virtualization.
Explore ways to run Claude Code through repeatable development loops, from simple command pipelines to persistent sessions, parallel agents, CI-backed pull requests, and RFC-driven task graphs. The skill explains when each pattern fits and how to manage context, reviews, and stopping conditions.
Use this skill to work with the Windows Package Manager CLI. It explains how to find, install, upgrade, remove, and manage packages, as well as configure sources, manifests, settings, and system state with WinGet Configuration.
Build Python command-line applications with Typer by looking up commands, arguments, options, callbacks, help output, and shell completion. The reference also explains how to test and package an app, and how Typer converts its definitions for Click.
Use this reference to set up and operate Epic Games Lore, a centralized version control system designed for projects with large binary assets. It explains repository workflows, branches, merges, file locks, CLI commands, configuration, and server deployment.
Use this reference to understand Git workflows and internals, from staging changes and managing branches to merging, rebasing, and working with remotes. It also covers diffs, hooks, worktrees, submodules, configuration, and commands for inspecting or recovering repository state.
Use HTTPie to send API requests from the command line, with headers, parameters, data, or file uploads. This skill covers authentication, saved sessions, response formatting, TLS settings, downloads, configuration, and scripting with exit codes.
Use this reference to build, test, and maintain Go projects with the `go` command. It covers modules and workspaces, environment settings, code generation, vetting, coverage, profiling, fuzzing, and cross-compilation, with guidance on flags and bundled tools.
Use this skill to manage Rust toolchains with rustup: install or update channels, add cross-compilation targets and components, and select a toolchain for a project or command. It explains overrides, proxy commands, profiles, and related environment settings.
Use this reference to work with the Rails command line: create apps, generate models and other components, run servers and tests, manage database tasks, and inspect configuration and environment variables. It also covers command flags, Rake tasks, and shell completion details.
Use this skill to understand Ruby code and its runtime, from objects, blocks, and exceptions to files, concurrency, and memory management. It also covers RubyGems and Bundler, command-line tools, environment variables, and the standard library.
Use this reference to manage GitHub from the terminal with `gh`. Find commands for repositories, pull requests, issues, releases, Actions, authentication, search, and API requests, and learn how to format command output as JSON or templates.