Skills
98,639 packaged capabilities and playbooks for agents. Install any of them with one command.
Development
Guide for video analysis and frame-level event detection tasks using OpenCV and similar libraries. This skill should be used when detecting events in videos (jumps, movements, gestures), extracting frames, analyzing motion patterns, or implementing computer vision algorithms on video data. It provides verification strategies and helps avoid common pitfalls in video processing workflows.
Enforces accessibility as a correctness property authored into each widget: Semantics(button/label) or ExcludeSemantics on every node; a11y state read from MediaQuery, not app state; never MediaQuery.withClampedTextScaling / textScaleFactor / FittedBox / TextOverflow.ellipsis to fit a label; non-color redundant channels (icon+label+shape+text) for every state; contrast against composited backgrounds (4.5:1 body / 3:1 large); 44px single-tap targets; OrdinalSortKey traversal; and honoring boldText / reduce-motion. Use when adding a GestureDetector/InkWell or any tap target, adding an Icon or Image, reaching for withClampedTextScaling/FittedBox/ellipsis/textScaleFactor to make text fit, encoding state via color, sizing type, ordering focus traversal, or reviewing any View for screen-reader/switch/low-vision support.
Expert guidance for receiving and processing inbound emails with Action Mailbox in Rails. Use when setting up inbound email processing, routing emails to mailboxes, configuring ingress providers (Mailgun, SendGrid, Postfix, etc.), handling attachments, bouncing emails, or testing with fixtures. Covers "action mailbox", "inbound email", "receive email", "process email", "email routing", "mailbox", "incoming email", "email processing", "ingress", "InboundEmail".
Expert guidance for Active Record callbacks — lifecycle hooks, ordering, conditional execution, transaction callbacks, and halting. VERY opinionated about when NOT to use callbacks. Use when working with callbacks, before_save, after_create, after_commit, lifecycle hooks, before_validation, around_save, after_update, before_destroy, or when deciding whether logic belongs in a callback vs a service object.
Expert guidance for encrypting sensitive data at rest using Active Record Encryption in Rails. Use when adding encryption to model attributes, rotating keys, migrating unencrypted data, querying encrypted fields, or protecting PII. Triggers on "encryption", "encrypt", "encrypts", "encrypted attribute", "at-rest encryption", "field encryption", "key rotation", "deterministic encryption", "PII", "sensitive data", "encrypt column", "encrypts macro".
Use this skill for MaxFrame SDK development and documentation navigation on Alibaba Cloud MaxCompute (ODPS). Helps answer questions about the MaxFrame API, concepts, official examples, and supported pandas APIs; create data processing programs; read and write MaxCompute tables; debug remote or local jobs; and build custom DPE runtime images. Trigger when users mention MaxFrame, MaxCompute with MaxFrame, ODPS table processing, DPE runtime, MaxFrame docs or examples, DataFrame/Tensor operations, or GPU runtime setup. Works for both English and Chinese queries about Alibaba Cloud data processing with MaxFrame.
Usage for alova v3 in browser/client-side/SSR applications (React, Nextjs, Vue3, Vue2, Nuxt, React-Native, Expo, Uniapp, Taro, Svelte, Svelitekit, Solid). Use this skill whenever the user asks about making an API request, fetching data, alova client-side usage including setup or refetching data across components, or any alova/client imports. Also trigger when the user mentions integrating alova with any of the frameworks above, managing request state or request cache, or building paginated lists/forms. If the project has multiple request tools, prefer alova.
Initialize an AscendC operator project and create a compilable operator skeleton. Use when: (1) the user asks to create a new operator; (2) keywords include ascendc operator, create operator, operator directory, or operator initialization; (3) they need to quickly implement from an ascend-kernel template. This skill does more than create directories: it also outputs standard files and a checklist ready for continued development.
Use when implementing on-device AI with Apple's Foundation Models framework — prevents context overflow, blocking UI, wrong model use cases, and manual JSON parsing when @Generable should be used. iOS 26+, macOS 26+, iPadOS 26+, axiom-visionOS 26+
Use when implementing haptic feedback, Core Haptics patterns, audio-haptic synchronization, or debugging haptic issues — covers UIFeedbackGenerator, CHHapticEngine, AHAP patterns, and Apple's Causality-Harmony-Utility design principles from WWDC 2021
CCXT cryptocurrency exchange library for PHP developers. Covers both REST API (standard) and WebSocket API (real-time). Helps install CCXT, connect to exchanges, fetch market data, place orders, stream live tickers/orderbooks, handle authentication, and manage errors in PHP 8.1+. Use when working with crypto exchanges in PHP projects, trading bots, or web applications. Supports both sync and async (ReactPHP) usage.
Expert guidance for CSS architecture in Rails applications using modern CSS (no Tailwind). Use when writing stylesheets, organizing CSS files, implementing dark mode, defining design tokens, using CSS custom properties, creating component styles, working with CSS layers (@layer), using the light-dark() function, setting up color schemes, or structuring CSS for maintainability. Covers design tokens, semantic color systems, component-scoped styles, utility classes, responsive patterns, and file organization.
Provides comprehensive guidance for the Electron EGG framework, including project structure, main/renderer processes, IPC, window management, and desktop app development. Use when the user asks about Electron EGG, needs to create Electron applications with EGG, or work with Electron EGG patterns.
Email sending integration. Covers Nodemailer (Node.js), Spring Mail (Java), smtplib (Python). Transactional email services: SendGrid, Amazon SES, Resend. Template engines: MJML, React Email. USE WHEN: user mentions "send email", "nodemailer", "SMTP", "SendGrid", "SES", "Resend", "transactional email", "email template", "MJML", "React Email", "spring mail" DO NOT USE FOR: push notifications - use `push-notifications`; SMS - different channel; email parsing/reading
Use when building or reviewing FaasJS plugins and runtime infrastructure: plugin lifecycle hooks including concurrent mount and failed-mount retry behavior, InvokeData mutation, DefineApiInject module augmentation, faas.yaml plugin loading, applyConfig, logger usage, @faasjs/node-utils, loadConfig, loadDotenv, module loaders, and Node-only bootstrap code.
Use when building or reviewing FaasJS React UI, especially @faasjs/ant-design pages, useFaas, useFaasStream, faas requests, CRUD screens, Table faasData, Description faasData, Form faas, conditional FormItem hidden/if behavior, drawers/modals, React hooks, shared state, and React tests.
Expert guidance for using and creating Rails generators. Use when running "rails generate", "rails g", scaffolding resources, generating models, controllers, migrations, mailers, jobs, or any generated code. Also use for creating custom generators, customizing generator defaults, overriding generator templates, or configuring config.generators. Covers all built-in generators, their flags, and when to use (or not use) each one.
Expert-level Go development with Go 1.22+ features, concurrency, standard library, and production-grade best practices. Use when the user mentions concurrency, microservices, or backend, or when the task involves idiomatic Go, goroutines and channels, context-based cancellation, or writing an HTTP server.
Scaffolds and adapts Node.js apps for GoDaddy Node.js Hosting (PaaS): package.json start/build scripts, PORT binding, single-app upload, and framework recipes. Use when building a new app, adapting an existing app, fixing deploy or start failures, or preparing AI tool exports (Replit, Lovable, Bolt, Cursor) for Node.js Hosting.
TỰ BẢO TRÌ framework overstack trên máy user (self-maintain) — migrate llmwiki cũ lên harness (case B) hoặc update bản mới (case C). MỘT lệnh `install-harness.sh --self-heal` tự cài + tự backfill nợ wiki (Origin/index/OKF) + refresh bản đồ năng lực + health-check trong 1 process, không vòng lặp re-run. Trigger: "tự bảo trì framework", "self-maintain", "migrate harness", "update harness", "update overstack", "nâng cấp harness", "cài harness vào dự án cũ", "/harness-update".
Use when the user asks to “create a hook,” “add a PreToolUse/PostToolUse/Stop hook,” “validate tool use,” “implement prompt-based hooks,” “use ${CLAUDE_PLUGIN_ROOT},” “set up event-driven automation,” “block dangerous commands,” or mentions hook events (PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification). Provides comprehensive guidance for creating and implementing Claude Code plugin hooks, focusing on the advanced prompt-based hooks API
Comprehensive Java development best practices covering SOLID principles, DRY, Clean Code, Java-specific patterns (Optional, immutability, streams, lambdas), exception handling, collections, concurrency, testing with JUnit 5 and Mockito, code organization, performance optimization, and common anti-patterns. Essential reference for uncle-duke-java agent during code reviews and architecture guidance.
Expert in AT-SPI2 (Assistive Technology Service Provider Interface) for Linux desktop automation. Specializes in accessible automation of GTK/Qt applications via D-Bus accessibility interface. HIGH-RISK skill requiring security controls for system-wide access
Migrates JSON Schemas between draft versions for use with z-schema. Use when upgrading schemas from draft-04 to draft-2020-12, converting between draft formats, updating deprecated keywords, replacing id with $id, converting definitions to $defs, migrating items to prefixItems, replacing dependencies with dependentRequired or dependentSchemas, adopting unevaluatedProperties or unevaluatedItems, or adapting schemas to newer JSON Schema features.
Create review-ready pull requests or merge requests from the current branch through a fork-aware, idempotent, preview-first, user-approved workflow. Use when the user asks to create, open, draft, or submit a PR, pull request, merge request, or code review request, or says their branch is ready for review.
Product changelog and release notes that users actually read. Covers categorization, user-facing language, visuals, and distribution. Use for: release notes, changelogs, product updates, feature announcements, versioning. Triggers: changelog, release notes, product update, version notes, what's new, feature announcement, product changelog, update log, release announcement, version release, product release, ship notes
Expert guidance for the Propshaft asset pipeline in Rails 8+. Use when working with assets, stylesheets, CSS organization, JavaScript assets, import maps, asset precompilation, fingerprinting, images, fonts, CDN setup, or migrating from Sprockets. Covers file structure, stylesheet_link_tag, image_tag, @layer ordering, @import, CSS custom properties, asset helpers, deployment, and common Propshaft pitfalls. Trigger on "propshaft", "asset pipeline", "assets", "stylesheet", "javascript assets", "import maps", "asset precompile", "CSS organization", "sprockets migration", "fingerprinting", "stylesheet_link_tag", "image_tag", "asset_path".
React 19+ patterns, performance optimization, and component architecture. Covers hooks, state management decision trees, data fetching with use() API, Server Components, React Compiler, bundle optimization, and re-render elimination. Use when building components, optimizing re-renders, fetching data, managing state, handling forms, structuring frontends, or reviewing React code.
Use Rozenite for Agents to inspect React Native DevTools data and Rozenite plugins on a live app target, either through shell-driven `rozenite agent` commands or programmatic `@rozenite/agent-sdk` usage. Trigger this skill for any task that needs live app inspection, debugging, or plugin interaction through Rozenite.
Designs, builds, and reviews clean, professional terminal UIs and CLIs across four ecosystems: Go (Bubble Tea/Lipgloss), Rust (Ratatui), Python (Textual), and TypeScript (Ink). Covers layout patterns, color systems, keybinding conventions, discoverability, and framework-specific design patterns.
Expert guidance for implementing UUID primary keys in Rails applications. Use when setting up UUIDs as primary keys, choosing between UUIDv4 and UUIDv7, configuring generators for UUID defaults, writing migrations with id colon uuid, adding UUID foreign keys, implementing base36 encoding for URL-friendly IDs, configuring PostgreSQL pgcrypto or gen_random_uuid, implementing SQLite binary UUID storage, choosing a primary key type, using non-sequential IDs, secure IDs, random IDs, or any ID generation strategy beyond auto-increment integers.
Expert guidance for implementing rich text editing with Action Text in Rails. Use when adding rich text fields, configuring Lexxy or Trix editors, rendering rich text content, handling attachments and embeds, creating custom attachables, styling rich text, or fixing N+1 queries with rich text. Triggers on "action text", "rich text", "lexxy", "trix", "WYSIWYG", "rich text editor", "has_rich_text", "text editor", "rich content", "embedded content", "rich_text_area", "action-text-attachment".
Implements AI agent interaction protocols. Adds WebMCP tool annotations, A2A Agent Cards, MCP server cards, live MCP endpoints, MCP Apps, OpenAPI documents, API catalogs, AI catalogs, Agent Skills indexes, NLWeb, SDK and CLI links, and agent commerce documents (x402, MPP, UCP, ACP, AP2, agent checkout) so AI agents can discover and use website functionality. Use when asked to "add WebMCP", "implement A2A", "create agent card", "add MCP server card", "create OpenAPI spec", "add api-catalog", "add NLWeb", "add MCP Apps", "support agent payments", "improve agent protocols score", "make site agent-interactive", or any WebMCP, A2A, MCP or OpenAPI task.
New to MCP?
From what the protocol is to installing your first server, these answers cover most first questions.
An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.