GitHub Copilot skills, plugins, subagents, slash commands and mcp servers

fixing-metadata ibelick skill Audits page metadata and fixes what's broken: titles, descriptions, canonical URLs, Open Graph, Twitter cards, icons and JSON-LD. Claude Code CX Codex Cursor 18,200installs core-web-vitals web-quality-skills skill A skill that measures first, then fixes LCP, INP and CLS. Handy when a page loads slowly or the layout jumps around. Claude Code CX Codex Cursor 31,900installs sandbox-migrate-to-next cloudflare skill Skill guides migration of Cloudflare Sandbox applications from the stable @cloudflare/sandbox package to the prerelease @cloudflare/sandbox@next (SDK 1.0). Use it when preparing code for the future stable release. Claude Code CX Codex Cursor 66,900installs speech official openai skill Generates voiceovers, narration, and IVR audio clips via OpenAI Audio API. Useful when your project needs spoken audio files from plain text. Claude Code CX Codex Cursor 3,500installs react vercel-labs skill This skill turns json-render JSON specs into React component trees. Use it when building JSON-driven UIs or defining a component catalog for generated specs. Claude Code CX Codex Cursor 16,300installs dotnet-upgrade official github skill Plan a .NET upgrade by reviewing project dependencies, choosing a migration order and preparing post-upgrade checks. 11,475installs srdf earthtojake skill This skill creates and validates MoveIt2 SRDF files paired with a URDF. Use it for planning groups, robot semantics, and review-ready handoff. Claude Code CX Codex Cursor 10,300installs unslop cursor skill This skill removes common AI writing patterns, filler, and vague phrasing while keeping the meaning and intended tone. Use it when polishing text. Claude Code CX Codex Cursor 27,700installs agent-eval colbymchenry skill Compares agent behavior with and without CodeGraph on a real repository. Use it to audit retrieval quality and test a local or published CodeGraph version. Claude Code CX Codex Cursor 1,800installs knowledge-synthesis official anthropics skill Merges search results across chats, emails, and documents into deduplicated answers with source attribution. Flags conflicting facts and scores source reliability. Claude Code CX Codex Cursor 6,400installs testing-strategy official anthropics skill This skill designs testing strategies and test plans for a project. Use it when you need test types, coverage goals, or gaps in existing checks. Claude Code CX Codex Cursor 6,400installs vue-best-practices github.com/vuejs-ai skill Enforces Vue 3 guidelines using Composition API and TypeScript. Helpful for structuring SFCs, managing reactivity, and writing composables. Claude Code CX Codex Cursor 42,700installs apple-appstore-reviewer official github skill Reviews an iOS project from an Apple App Store reviewer’s perspective and ranks rejection risks. Use it before submitting an app for review. 11,295installs yeet official openai skill Walks a change from git add to a draft pull request using gh. Runs only when you ask for it explicitly. Claude Code CX Codex Cursor 3,400installs chakra-ui-builder chakra-ui skill Build responsive, accessible interfaces with Chakra UI v3, add the library to a project, and shape its theme. Useful for components, pages, and layouts. Claude Code CX Codex Cursor 3,500installs view-pdf official anthropics skill Opens PDFs in an interactive viewer for shared markup, form filling, highlights, stamps, and visual signatures. Use it when text reading alone is not enough. Claude Code CX Codex Cursor 6,300installs update-implementation-plan official github skill Updates an existing implementation plan for new requirements, refactoring, package upgrades, or architecture changes. Use it when a plan needs actionable tasks and checks. 11,107installs modern-web-guidance GoogleChrome skill A skill that searches a catalog of modern web guides and feeds the matching one to your agent. Useful when the model's training data has stale HTML, CSS or client-side JS patterns. Claude Code CX Codex Cursor 34,900installs openspec-sync-specs openspec skill Syncs delta specs from an active OpenSpec change directly into main project specs without triggering change archiving. Claude Code CX Codex Cursor 3,800installs make-repo-contribution official github skill This skill checks repository rules before issues, branches, commits, or pull requests, then guides the contribution workflow. 11,073installs review-and-refactor official github skill Reviews project code against local instructions and refactors parts that need changes. Use it before review or when cleaning up an existing codebase. 11,056installs github-triage code-yeongyu skill Reads every open issue and PR in a repo and writes evidence-backed reports. It never comments, merges or closes anything. Claude Code CX Codex Cursor 2,700installs editorconfig official github skill Creates an .editorconfig after reviewing project files and formatting preferences. Use it when a project needs consistent editor rules. 10,960installs code-simplifier rtk-ai skill Reviews Rust code in RTK to remove over-engineering and needless allocations. It applies idiomatic simplifications without altering runtime behavior. Claude Code CX Codex Cursor 2,100installs rtk-tdd rtk-ai skill This skill enforces a Red-Green-Refactor workflow for Rust and activates on implementation, testing, refactoring, and bug-fixing tasks. Claude Code CX Codex Cursor 2,100installs learn rohitg00 skill Walks you through the AI Engineering from Scratch curriculum: pulls the next lesson, teaches it section by section in the terminal, quizzes you, and logs progress. Claude Code CX Codex Cursor 4,200installs cookbook-audit official anthropics skill A skill that audits Anthropic Cookbook notebooks against the style guide: checks structure, code quality, security, and learning objectives. Use it when writing or reviewing notebooks with examples. Claude Code CX Codex Cursor 776installs expo-dev-client expo skill Skill for building and distributing custom Expo development clients to physical devices via local builds or TestFlight. Use it when your app includes native code, Apple widgets, or third-party native modules not in Expo Go. Claude Code CX Codex Cursor 70,000installs csharp-async official github skill This skill guides Copilot through C# async best practices and flags common mistakes. Use it when reviewing async methods, tasks, and public APIs. 10,883installs hatch-pet official openai skill Creates and packages animated pets and spritesheets for Codex. Use it to turn a character concept, reference image, or brand cues into a pet. Claude Code CX Codex Cursor 3,300installs upgrade-stripe stripe skill Guides an agent through Stripe API, webhook, and SDK version upgrades. Use it when moving an integration to a target API version. Claude Code CX Codex Cursor 72,800installs java-docs official github skill Guides Javadoc work for Java types while following the project’s documentation style. Use it when adding or revising API comments. 10,752installs create-github-action-workflow-specification official github skill This skill turns an existing GitHub Actions workflow into a formal specification for AI-assisted maintenance and review. 10,745installs playwright-best-practices currents.dev skill A reference skill for Playwright test architecture, locator design, and Page Object Model. Helps debug flaky runs, mock network requests, and audit accessibility. Claude Code CX Codex Cursor 98,200installs course-guide rohitg00 skill Finds AI Engineering from Scratch lessons for a topic, question, or bug and suggests a next action. Use it when you need a course route for what you are learning. Claude Code CX Codex Cursor 4,100installs gcode earthtojake skill Slices STL, 3MF, and OBJ models into printer-ready G-code through OrcaSlicer. Use it when you need a print file without connecting to the printer. Claude Code CX Codex Cursor 9,500installs core vercel-labs skill Defines the schema and component catalog for json-render and builds the system prompt that makes an AI emit JSON UI specs. Claude Code CX Codex Cursor 15,000installs cli-creator official openai skill Builds durable command-line tools from API docs, OpenAPI specs, or curl commands. Configures system-wide binaries with JSON output and auth handling. Claude Code CX Codex Cursor 3,200installs winui-app official openai skill This skill helps create, configure, and review WinUI 3 apps built with C# and the Windows App SDK. Use it for new projects or XAML issues. Claude Code CX Codex Cursor 3,200installs typescript-expert sickn33 skill A skill for TypeScript and JavaScript work: it reads your project setup, fixes type errors and speeds up type checking. Useful once a TS codebase gets big. Claude Code CX Codex Cursor 12,600installs