Claude Skills
The open format is called Agent Skills and works in Claude Code, Codex, Cursor and other agents — most people know it as Claude Skills.
Every Agent Skill we could find on GitHub, deduplicated by content. 79 354 files from 1 739 authors, of which 61 713 are unique — the rest is the same skill repackaged into someone else's repository. For each one: what it weighs in tokens, whether it ships runnable scripts, and which MCP servers it needs.
Use this agent when you receive a bug report or issue description and need to verify whether the reported behavior is actually a bug. This agent will attempt to reproduce the issue systematically, validate the steps to reproduce, and confirm whether the behavior deviates from expected functionality. <example>\\nContext: The user has reported a potential bug in the application.\\nuser: \"Users are reporting that the email processing fails when there are special characters in the subject line\"\\nassistant: \"I'll use the bug-reproduction-validator agent to verify if this is an actual bug by attempting to reproduce it\"\\n<commentary>\\nSince there's a bug report about email processing with special characters, use the bug-reproduction-validator agent to systematically reproduce and validate the issue.\\n</commentary>\\n</example>\\n<example>\\nContext: An issue has been raised about unexpected behavior.\\nuser: \"There's a report that the brief summary isn't including all emails from today\"\\nassistant: \"Let me launch the b...
Create or edit Claude Code skills with expert guidance on structure and best practices
Use this agent when you need a final review pass to ensure code changes are as simple and minimal as possible. This agent should be invoked after implementation is complete but before finalizing changes, to identify opportunities for simplification, remove unnecessary complexity, and ensure adherence to YAGNI principles. Examples: <example>Context: The user has just implemented a new feature and wants to ensure it's as simple as possible. user: \"I've finished implementing the user authentication system\" assistant: \"Great! Let me review the implementation for simplicity and minimalism using the code-simplicity-reviewer agent\" <commentary>Since implementation is complete, use the code-simplicity-reviewer agent to identify simplification opportunities.</commentary></example> <example>Context: The user has written complex business logic and wants to simplify it. user: \"I think this order processing logic might be overly complex\" assistant: \"I'll use the code-simplicity-reviewer agent to analyze the complexity...
Capture solved problems as categorized documentation with YAML frontmatter for fast lookup
Expert guidance for creating, writing, and refining Claude Code Skills. Use when working with SKILL.md files, authoring new skills, improving existing skills, or understanding skill structure and best practices.
Use when writing, reviewing, or refactoring code. Apply when naming variables or functions, structuring classes, handling errors, writing tests, or when code feels complex or hard to understand. Based on Robert C. Martin's Clean Code.
Create engaging changelogs for recent merges to main branch
Use this agent when reviewing PRs that touch database migrations, data backfills, or any code that transforms production data. This agent validates ID mappings against production reality, checks for swapped values, verifies rollback safety, and ensures data integrity during schema changes. Essential for any migration that involves ID mappings, column renames, or data transformations. <example>Context: The user has a PR with database migrations that involve ID mappings. user: \"Review this PR that migrates from action_id to action_module_name\" assistant: \"I'll use the data-migration-expert agent to validate the ID mappings and migration safety\" <commentary>Since the PR involves ID mappings and data migration, use the data-migration-expert to verify the mappings match production and check for swapped values.</commentary></example> <example>Context: The user has a migration that transforms enum values. user: \"This migration converts status integers to string enums\" assistant: \"Let me have the data-migration-ex...
Use this agent when you need to review database migrations, data models, or any code that manipulates persistent data. This includes checking migration safety, validating data constraints, ensuring transaction boundaries are correct, and verifying that referential integrity and privacy requirements are maintained. <example>Context: The user has just written a database migration that adds a new column and updates existing records. user: \"I've created a migration to add a status column to the orders table\" assistant: \"I'll use the data-integrity-guardian agent to review this migration for safety and data integrity concerns\" <commentary>Since the user has created a database migration, use the data-integrity-guardian agent to ensure the migration is safe, handles existing data properly, and maintains referential integrity.</commentary></example> <example>Context: The user has implemented a service that transfers data between models. user: \"Here's my new service that moves user data from the legacy_users table...
Enhance a plan with parallel research agents for each section to add depth, best practices, and implementation details
Use when designing databases for data-heavy applications, making schema decisions for performance, choosing between normalization and denormalization, selecting storage/indexing strategies, planning for scale, or evaluating OLTP vs OLAP trade-offs. Also use when encountering N+1 queries, ORM issues, or concurrency problems.
Validate and prepare documentation for GitHub Pages deployment
Systematic debugging that identifies root causes rather than treating symptoms. Uses sequential thinking for complex analysis, web search for research, and structured investigation to avoid circular reasoning and whack-a-mole fixes.
Use this agent when a PR touches production data, migrations, or any behavior that could silently discard or duplicate records. Produces a concrete pre/post-deploy checklist with SQL verification queries, rollback procedures, and monitoring plans. Essential for risky data changes where you need a Go/No-Go decision. <example>Context: The user has a PR that modifies how emails are classified. user: \"This PR changes the classification logic, can you create a deployment checklist?\" assistant: \"I'll use the deployment-verification-agent to create a Go/No-Go checklist with verification queries\" <commentary>Since the PR affects production data behavior, use deployment-verification-agent to create concrete verification and rollback plans.</commentary></example> <example>Context: The user is deploying a migration that backfills data. user: \"We're about to deploy the user status backfill\" assistant: \"Let me create a deployment verification checklist with pre/post-deploy checks\" <commentary>Backfills are high-risk de...
Use this agent when you need to verify that a UI implementation matches its Figma design specifications. This agent should be called after code has been written to implement a design, particularly after HTML/CSS/React components have been created or modified. The agent will visually compare the live implementation against the Figma design and provide detailed feedback on discrepancies.\\n\\nExamples:\\n- <example>\\n Context: The user has just implemented a new component based on a Figma design.\\n user: \"I've finished implementing the hero section based on the Figma design\"\\n assistant: \"I'll review how well your implementation matches the Figma design.\"\\n <commentary>\\n Since UI implementation has been completed, use the design-implementation-reviewer agent to compare the live version with Figma.\\n </commentary>\\n </example>\\n- <example>\\n Context: After the general code agent has implemented design changes.\\n user: \"Update the button styles to match the new design system\"\\n assistant: \"I've updated the butto...
Use this agent PROACTIVELY when design work isn't coming together on the first attempt. If you've made 1-2 design changes and the result still feels off, suggest using this agent with 5x or 10x iterations for deeper refinement. This agent takes screenshots, analyzes what's not working, implements improvements, and repeats N times to systematically fix design issues. Perfect when colors feel wrong, layouts aren't balanced, or the overall aesthetic needs work that single changes can't achieve. <example>Context: User asks to change button color but result still looks off. user: \"Change the button to blue\" assistant: [makes change, takes screenshot] \"The button is now blue, but I notice the overall color balance still feels off. Would you like me to use the design-iterator agent with 5 iterations to systematically improve the color harmony and visual balance?\" <commentary>PROACTIVE USE: After a simple change doesn't fully resolve the design issue, suggest the design-iterator to do deeper work.</commentary></ex...
Use when designing software architecture, refactoring code structure, solving recurring design problems, or when code exhibits symptoms like tight coupling, rigid hierarchies, scattered responsibilities, or difficult-to-test components. Also use when choosing between architectural approaches or reviewing code for structural improvements.
This skill should be used when writing Ruby and Rails code in DHH's distinctive 37signals style. It applies when writing Ruby code, Rails applications, creating models, controllers, or any Ruby file. Triggers on Ruby/Rails code generation, refactoring requests, code review, or when the user mentions DHH, 37signals, Basecamp, HEY, or Campfire style. Embodies REST purity, fat models, thin controllers, Current attributes, Hotwire patterns, and the "clarity over cleverness" philosophy.
This skill should be used when working with DSPy.rb, a Ruby framework for building type-safe, composable LLM applications. Use this when implementing predictable AI features, creating LLM signatures and modules, configuring language model providers (OpenAI, Anthropic, Gemini, Ollama), building agent systems with tools, optimizing prompts, or testing LLM-powered functionality in Ruby applications.
Use this agent when you need a brutally honest Rails code review from the perspective of David Heinemeier Hansson. This agent excels at identifying anti-patterns, JavaScript framework contamination in Rails codebases, and violations of Rails conventions. Perfect for reviewing Rails code, architectural decisions, or implementation plans where you want uncompromising feedback on Rails best practices.\\n\\n<example>\\nContext: The user wants to review a recently implemented Rails feature for adherence to Rails conventions.\\nuser: \"I just implemented a new user authentication system using JWT tokens and a separate API layer\"\\nassistant: \"I'll use the DHH Rails reviewer agent to evaluate this implementation\"\\n<commentary>\\nSince the user has implemented authentication with patterns that might be influenced by JavaScript frameworks (JWT, separate API layer), the dhh-rails-reviewer agent should analyze this critically.\\n</commentary>\\n</example>\\n\\n<example>\\nContext: The user is planning a new Rails feature and wan...
Use when needing to scrape documentation websites into markdown for AI context. Triggers on "scrape docs", "download documentation", "get docs for [library]", or creating local copies of online documentation. CRITICAL - always analyze sitemap first before scraping.
Use when user wants to extract text from ebooks (EPUB, MOBI, PDF). Use for converting ebooks to plain text for analysis, processing, or reading. Handles all common ebook formats.
Use this agent when you need to review and edit text content to conform to Every's specific style guide. This includes reviewing articles, blog posts, newsletters, documentation, or any written content that needs to follow Every's editorial standards. The agent will systematically check for title case in headlines, sentence case elsewhere, company singular/plural usage, overused words, passive voice, number formatting, punctuation rules, and other style guide requirements.
Use this agent when you need to synchronize a web implementation with its Figma design by automatically detecting and fixing visual differences. This agent should be used iteratively until the implementation matches the design.\\n\\n<example>\\nContext: User has just implemented a new component and wants to ensure it matches the Figma design.\\nuser: \\\"I've just finished implementing the hero section component. Can you check if it matches the Figma design at https://figma.com/file/abc123/design?node-id=45:678\\\"\\nassistant: \\\"I'll use the figma-design-sync agent to compare your implementation with the Figma design and fix any differences.\\\"\\n<uses Task tool to launch figma-design-sync agent with the Figma URL and local URL>\\n</example>\\n\\n<example>\\nContext: User is working on responsive design and wants to verify mobile breakpoint matches design.\\nuser: \\\"The mobile view doesn't look quite right. Here's the Figma: https://figma.com/file/xyz789/mobile?node-id=12:34\\\"\\nassistant: \\\"Let me use the figma-design-sy...
Record a video walkthrough of a feature and add it to the PR description
This skill should be used when creating distinctive, production-grade frontend interfaces with high design quality. It applies when the user asks to build web components, pages, or applications. Generates creative, polished code that avoids generic AI aesthetics.
Use this agent when you need to gather comprehensive documentation and best practices for frameworks, libraries, or dependencies in your project. This includes fetching official documentation, exploring source code, identifying version-specific constraints, and understanding implementation patterns. <example>Context: The user needs to understand how to properly implement a new feature using a specific library. user: \"I need to implement file uploads using Active Storage\" assistant: \"I'll use the framework-docs-researcher agent to gather comprehensive documentation about Active Storage\" <commentary>Since the user needs to understand a framework/library feature, use the framework-docs-researcher agent to collect all relevant documentation and best practices.</commentary></example> <example>Context: The user is troubleshooting an issue with a gem. user: \"Why is the turbo-rails gem not working as expected?\" assistant: \"Let me use the framework-docs-researcher agent to investigate the turbo-rails documentation...
This skill should be used when managing the file-based todo tracking system in the todos/ directory. It provides workflows for creating todos, managing status and dependencies, conducting triage, and integrating with slash commands and code review processes.
This skill should be used when generating and editing images using the Gemini API (Nano Banana Pro). It applies when creating images from text prompts, editing existing images, applying style transfers, generating logos with text, creating stickers, product mockups, or any image generation/manipulation task. Supports text-to-image, image editing, multi-turn refinement, and composition from multiple reference images.
Create a new custom slash command following conventions and best practices
This skill manages Git worktrees for isolated parallel development. It handles creating, listing, switching, and cleaning up worktrees with a simple interactive interface, following KISS principles.
Use this agent when you need to understand the historical context and evolution of code changes, trace the origins of specific code patterns, identify key contributors and their expertise areas, or analyze patterns in commit history. This agent excels at archaeological analysis of git repositories to provide insights about code evolution and development patterns. <example>Context: The user wants to understand the history and evolution of recently modified files.\\nuser: \"I've just refactored the authentication module. Can you analyze the historical context?\"\\nassistant: \"I'll use the git-history-analyzer agent to examine the evolution of the authentication module files.\"\\n<commentary>Since the user wants historical context about code changes, use the git-history-analyzer agent to trace file evolution, identify contributors, and extract patterns from the git history.</commentary></example> <example>Context: The user needs to understand why certain code patterns exist.\\nuser: \"Why does this payment processing...
Fix incorrect SKILL.md files when a skill has wrong instructions or outdated API references
Use this agent when you need to review Python code changes with an extremely high quality bar. This agent should be invoked after implementing features, modifying existing code, or creating new Python modules. The agent applies Kieran's strict Python conventions and taste preferences to ensure code meets exceptional standards.\\n\\nExamples:\\n- <example>\\n Context: The user has just implemented a new FastAPI endpoint.\\n user: \"I've added a new user registration endpoint\"\\n assistant: \"I've implemented the registration endpoint. Now let me have Kieran review this code to ensure it meets our quality standards.\"\\n <commentary>\\n Since new endpoint code was written, use the kieran-python-reviewer agent to apply Kieran's strict Python conventions and quality checks.\\n </commentary>\\n</example>\\n- <example>\\n Context: The user has refactored an existing service class.\\n user: \"Please refactor the EmailService class to handle attachments\"\\n assistant: \"I've refactored the EmailService to handle attachments.\"\\n <com...
Context and working knowledge for Calci’s prediction-market domain, which is powered by Kalshi. Use this skill whenever the user asks about Calci prediction markets, Kalshi markets, tickers, order books, pricing, settlement, or the Kalshi API/WebSocket.
Use this agent when you need to review JavaScript or Stimulus frontend code changes with a special eye for race conditions. The agent should be invoked after implementing JavaScript features, modifying existing JavaScript code, or when creating or modifying Stimulus controllers. The agent applies Julik's eye for UI race conditions in JavaScript and Stimulus code. Examples: - <example> Context: The user has just implemented a new Stimulus controller. user: \"I've created a new controller for showing and hiding toasts\" assistant: \"I've implemented the controller. Now let me have Julik take a look at possible race conditions and DOM irregularities.\" <commentary> Since new Stimulus controller code was written, use the julik-frontend-races-reviewer agent to apply Julik's uncanny knowledge of UI data races and quality checks in JavaScript and Stimulus code. </commentary> </example> - <example> Context: The user has refactored an existing Stimulus controller. user: \"Please refactor the controller to slowly animate...
Use this agent when you need to review Rails code changes with an extremely high quality bar. This agent should be invoked after implementing features, modifying existing code, or creating new Rails components. The agent applies Kieran's strict Rails conventions and taste preferences to ensure code meets exceptional standards.\\n\\nExamples:\\n- <example>\\n Context: The user has just implemented a new controller action with turbo streams.\\n user: \"I've added a new update action to the posts controller\"\\n assistant: \"I've implemented the update action. Now let me have Kieran review this code to ensure it meets our quality standards.\"\\n <commentary>\\n Since new controller code was written, use the kieran-rails-reviewer agent to apply Kieran's strict Rails conventions and quality checks.\\n </commentary>\\n</example>\\n- <example>\\n Context: The user has refactored an existing service object.\\n user: \"Please refactor the EmailProcessor service to handle attachments\"\\n assistant: \"I've refactored the EmailProcessor...
Use this agent when you need to review TypeScript code changes with an extremely high quality bar. This agent should be invoked after implementing features, modifying existing code, or creating new TypeScript components. The agent applies Kieran's strict TypeScript conventions and taste preferences to ensure code meets exceptional standards.\\n\\nExamples:\\n- <example>\\n Context: The user has just implemented a new React component with hooks.\\n user: \"I've added a new UserProfile component with state management\"\\n assistant: \"I've implemented the UserProfile component. Now let me have Kieran review this code to ensure it meets our quality standards.\"\\n <commentary>\\n Since new component code was written, use the kieran-typescript-reviewer agent to apply Kieran's strict TypeScript conventions and quality checks.\\n </commentary>\\n</example>\\n- <example>\\n Context: The user has refactored an existing service module.\\n user: \"Please refactor the EmailService to handle attachments\"\\n assistant: \"I've refactored t...
Full autonomous engineering workflow
Use this agent when you need to search institutional learnings in docs/solutions/ for relevant past solutions before implementing a new feature or fixing a problem. This agent efficiently filters documented solutions by frontmatter metadata (tags, category, module, symptoms) to find applicable patterns, gotchas, and lessons learned. The agent excels at preventing repeated mistakes by surfacing relevant institutional knowledge before work begins.\\n\\n<example>Context: User is about to implement a feature involving email processing.\\nuser: \"I need to add email threading to the brief system\"\\nassistant: \"I'll use the learnings-researcher agent to check docs/solutions/ for any relevant learnings about email processing or brief system implementations.\"\\n<commentary>Since the user is implementing a feature in a documented domain, use the learnings-researcher agent to surface relevant past solutions before starting work.</commentary></example>\\n\\n<example>Context: User is debugging a performance issue.\\nuser: \"Bri...
Use when user shares a Medium article URL behind a paywall and wants to read the full content. Also use for articles on Medium-hosted publications like towardsdatascience.com, betterprogramming.pub, levelup.gitconnected.com, etc.
Use when designing or building modern web applications in JavaScript/TypeScript (SPA/SSR/SSG/ISR/RSC): architecture trade-offs, state/data patterns, performance, testing, delivery, and team scaling.
Use this agent when you need to run linting and code quality checks on Ruby and ERB files. Run before pushing to origin.
Use this agent when you need to analyze code for design patterns, anti-patterns, naming conventions, and code duplication. This agent excels at identifying architectural patterns, detecting code smells, and ensuring consistency across the codebase. <example>Context: The user wants to analyze their codebase for patterns and potential issues.\\nuser: \"Can you check our codebase for design patterns and anti-patterns?\"\\nassistant: \"I'll use the pattern-recognition-specialist agent to analyze your codebase for patterns, anti-patterns, and code quality issues.\"\\n<commentary>Since the user is asking for pattern analysis and code quality review, use the Task tool to launch the pattern-recognition-specialist agent.</commentary></example><example>Context: After implementing a new feature, the user wants to ensure it follows established patterns.\\nuser: \"I just added a new service layer. Can we check if it follows our existing patterns?\"\\nassistant: \"Let me use the pattern-recognition-specialist agent to analyze the n...
Use this agent when you need to analyze code for performance issues, optimize algorithms, identify bottlenecks, or ensure scalability. This includes reviewing database queries, memory usage, caching strategies, and overall system performance. The agent should be invoked after implementing features or when performance concerns arise.\\n\\n<example>\\nContext: The user has just implemented a new feature that processes user data.\\nuser: \"I've implemented the user analytics feature. Can you check if it will scale?\"\\nassistant: \"I'll use the performance-oracle agent to analyze the scalability and performance characteristics of your implementation.\"\\n<commentary>\\nSince the user is concerned about scalability, use the Task tool to launch the performance-oracle agent to analyze the code for performance issues.\\n</commentary>\\n</example>\\n\\n<example>\\nContext: The user is experiencing slow API responses.\\nuser: \"The API endpoint for fetching reports is taking over 2 seconds to respond\"\\nassistant: \"Let me invoke the...
Have multiple specialized agents review a plan in parallel
Use this agent when you need to address comments on pull requests or code reviews by making the requested changes and reporting back on the resolution. This agent handles the full workflow of understanding the comment, implementing the fix, and providing a clear summary of what was done. <example>Context: A reviewer has left a comment on a pull request asking for a specific change to be made.user: \"The reviewer commented that we should add error handling to the payment processing method\"assistant: \"I'll use the pr-comment-resolver agent to address this comment by implementing the error handling and reporting back\"<commentary>Since there's a PR comment that needs to be addressed with code changes, use the pr-comment-resolver agent to handle the implementation and resolution.</commentary></example><example>Context: Multiple code review comments need to be addressed systematically.user: \"Can you fix the issues mentioned in the code review? They want better variable names and to extract the validation logic\"as...
A comprehensive guide for interacting with PostgreSQL 16 databases. Use this skill for constructing standard and advanced SQL queries, optimizing performance, debugging errors, managing schema objects, and introspecting database structure.
Build and update the documentation site with current plugin components
Upload, sync, and manage files across cloud storage providers using rclone. Use when uploading files (images, videos, documents) to S3, Cloudflare R2, Backblaze B2, Google Drive, Dropbox, or any S3-compatible storage. Triggers on "upload to S3", "sync to cloud", "rclone", "backup files", "upload video/image to bucket", or requests to transfer files to remote storage.
Bootstrap new projects with strong typing, linting, formatting, and testing. Supports Python, TypeScript, and other languages with research fallback.
Use this agent when you need to conduct thorough research on a repository's structure, documentation, and patterns. This includes analyzing architecture files, examining GitHub issues for patterns, reviewing contribution guidelines, checking for templates, and searching codebases for implementation patterns. The agent excels at gathering comprehensive information about a project's conventions and best practices.\\n\\nExamples:\\n- <example>\\n Context: User wants to understand a new repository's structure and conventions before contributing.\\n user: \"I need to understand how this project is organized and what patterns they use\"\\n assistant: \"I'll use the repo-research-analyst agent to conduct a thorough analysis of the repository structure and patterns.\"\\n <commentary>\\n Since the user needs comprehensive repository research, use the repo-research-analyst agent to examine all aspects of the project.\\n </commentary>\\n</example>\\n- <example>\\n Context: User is preparing to create a GitHub issue and wants to foll...
Reproduce and investigate a bug using logs, console inspection, and browser screenshots
Report a bug in the compound-engineering plugin
Resolve all TODO comments using parallel processing
Resolve all PR comments using parallel processing
Resolve all pending CLI todos using parallel processing
Use this agent when you need to perform security audits, vulnerability assessments, or security reviews of code. This includes checking for common security vulnerabilities, validating input handling, reviewing authentication/authorization implementations, scanning for hardcoded secrets, and ensuring OWASP compliance. <example>Context: The user wants to ensure their newly implemented API endpoints are secure before deployment.\\nuser: \"I've just finished implementing the user authentication endpoints. Can you check them for security issues?\"\\nassistant: \"I'll use the security-sentinel agent to perform a comprehensive security review of your authentication endpoints.\"\\n<commentary>Since the user is asking for a security review of authentication code, use the security-sentinel agent to scan for vulnerabilities and ensure secure implementation.</commentary></example> <example>Context: The user is concerned about potential SQL injection vulnerabilities in their database queries.\\nuser: \"I'm worried about SQL inj...
Use when searching text in files, codebases, books, or documents. Use when finding files by pattern, searching large files that are too big to read fully, extracting specific content from many files, or when grep/find is too slow. Triggers on "search for", "find occurrences", "look for pattern", "search in files".
Use BEFORE and AFTER running trading engine simulations. Helps with: (1) SETUP - choosing configs, selecting segments via segment collections, batch sizing (recommend 2,000-3,000 runs); (2) EXECUTION - running batch simulations with --collection; (3) ANALYSIS - comprehensive diagnostics after runs. Triggers on: 'run simulations', 'test configs', 'batch simulation', 'analyze sim results', 'which configs to test', 'how many segments', 'simulation setup'.
Claude Skills — questions
Answers built from the skills we actually parsed.