Skills
98,639 packaged capabilities and playbooks for agents. Install any of them with one command.
Development
This skill should be used when the user needs to design, review, or document complex software architectures. Use when creating C4 diagrams, writing Architecture Decision Records (ADRs), applying Clean, Hexagonal, or Domain-Driven Design patterns, or conducting system design reviews.
Frontend-backend communication patterns in Shopify Remix apps. Use when adding pages that need backend data, creating data mutations, using loaders and actions, handling authenticated requests, or managing session and authentication in routes.
Use when designing or implementing Spring Data JPA on Spring Boot 4 — repository boundaries, projections, query patterns, custom repositories, CQRS read models, entity relationships, or persistence performance fixes. Not for generic SQL help, database admin work, or project-wide migration (see the springboot-migration skill).
Build, integrate, and answer how-to questions for Stream Chat in Unreal Engine games and apps. Use for Unreal Engine / UE5 / C++ / Blueprint / UMG project work - plugin install per engine version, StreamChatClientComponent wiring on the HUD, ConnectUser and tokens, channels and messages, the shipped WBP_* chat widgets, theming, cooking, and iOS / Android / desktop packaging. Triggers on unreal, unreal engine, ue5, ue 5.7, ue 5.8, .uproject, .uplugin, Build.cs, umg, blueprint, widget blueprint, StreamChat plugin, UStreamChatClientComponent, UChatChannel, FChannelProperties, WBP_TeamChat, in-game chat, game chat. Chat only - there is no Stream Video or Feeds SDK for Unreal.
Server-side Stripe webhook idempotency patterns. PROACTIVELY activate for: (1) Stripe webhook handler design, (2) Transactional dedup via stripe_processed_events, (3) credit_transactions.idempotency_key UNIQUE partial indexes, (4) Idempotency-Key header priority (header > body > server UUID), (5) Idempotency key format/charset/length validation at the handler edge, (6) FOR UPDATE row locking when a UPDATE depends on a prior SELECT, (7) Webhook signature verification (stripe.webhooks.constructEventAsync, tolerance, raw-body reading), (8) Retry-safe endpoints with randomUUID fallback, (9) Durable checkpoint row ordering (checkpoint FIRST, mutation SECOND). Provides: complete webhook handler skeleton, Idempotency-Key validator, dedup SQL, FOR UPDATE pattern, signature verification example.
Write, review, or audit Cairo anonymizer (helper) contracts for stateless or atomic STRK20 private DeFi. Covers the privacy_invoke entry point, OpenNoteDeposit returns, the balance-delta idiom, and swap, Vesu lending, and escrow patterns. Use when a privacy_invoke helper is actually the selected route; persistent positions may instead use the canonical shadow-account route in strk20-wallet-api.
Build privacy wallets and key-holding backends with the Starknet Privacy SDK (@starkware-libs/starknet-privacy-sdk). Covers createPrivateTransfers wiring, register, deposit, transfer, withdraw, multi-op batches, shadow accounts (formerly private sub-accounts), note discovery, setup requirements, and proving configuration. Also use for debugging SDK submissions: provingBlockId, proofFacts, tip 0n, INVALID_NONCE, note maturity, fresh-account sequencing, and AddressMap lookups. If the app talks to the user's wallet instead of holding keys, use strk20-wallet-api. For concepts use strk20-privacy.
Implement or review application behavior, APIs, state transitions, data flow, and business rules with explicit contracts and failure handling. Use for logic-bearing changes across frontend or backend systems. Do not use for visual-only or copy-only work.
Build, redesign, or visually refine product interfaces using project evidence, real content, functional states, and deliberate composition. Use for implementation work on websites, apps, dashboards, landing pages, or component systems. Do not use for read-only audits or logic-only changes.
Expert guidance on Swift Concurrency best practices, patterns, and implementation. Use when developers mention: (1) Swift Concurrency, async/await, actors, or tasks, (2) modern concurrency patterns or structured concurrency, (3) migrating to Swift 6 or strict concurrency checking, (4) data races or thread safety issues, (5) refactoring closures to async/await, (6) @MainActor, Sendable, or actor isolation, (7) concurrent code architecture or performance, (8) concurrency-related linter warnings, (9) AsyncSequence, AsyncStream, or task groups, (10) nonisolated, @preconcurrency, or @unchecked Sendable.
Expert guidance on Swift best practices, patterns, and implementation. Use when developers mention: (1) Swift configuration or environment variables, (2) swift-log or logging patterns, (3) OpenTelemetry or swift-otel, (4) Swift Testing framework or @Test macro, (5) Foundation avoidance or cross-platform Swift, (6) platform-specific code organization, (7) Span or memory safety patterns, (8) non-copyable types (~Copyable), (9) API design patterns or access modifiers.
Implement Syncfusion Gantt Chart using JavaScript/TypeScript (Essential JS 2). Use this when working with ej2-gantt component for project scheduling, task dependencies, and timeline management. Covers full Gantt implementation including data binding, task scheduling (auto/manual/custom, week/month duration units), columns (serial number column), resources, timeline configuration, WBS, resource view, critical path, baseline tracking, filtering, sorting, editing (taskbar draw for creating unscheduled tasks), and export functionality (Excel/PDF). Advanced features: task calendars with custom working time, hierarchical checkbox selection modes, dependency type restrictions (allowedDependencyTypes), calendar-driven scheduling with holidays and working time exceptions.
[Hyper] Use when working on TanStack Start projects and the task involves auth, sessions, cookies, CSRF, secrets, env exposure, server functions/routes, headers/CSP, webhooks, or security review/fixes. Triggers on protecting routes, hardening auth flows, preventing secret leaks, securing server boundaries, or reviewing HTTP/security behavior in a TanStack Start app.
Telegram Bot development playbook: bot fundamentals, aiogram 3 patterns (handlers/middlewares/FSM), webhooks, keyboard UX, inline mode, Mini Apps, payments (Stars/subscriptions), authentication. Use when building or modifying Telegram bots, setting up webhook infrastructure, implementing inline keyboards/callback queries, integrating Telegram payments or Stars, or working with aiogram 3 handlers and FSM. Keywords: Telegram, aiogram, Bot API, webhook, handlers, middlewares, FSM, inline keyboard, reply keyboard, callback_query, inline mode, Mini Apps, Web Apps, payments, Telegram Stars, Login Widget.
Opinionated constraints for building better interfaces with agents. Use when building UI components, implementing animations, designing layouts, reviewing frontend accessibility, or working with Tailwind CSS, motion/react, or accessible primitives like Radix/Base UI.
Turn a screen recording of a UI (page load, navigation, redirect/auth flow, app startup) into an interactive paint timeline page. You get a full-window video, a timeline of each visual paint with timestamps and durations, and on-video flashes of what was painted (pink) versus what only moved (blue). Use when the user shares a screen recording (.mp4/.mov) and asks for a timeline of paints, frames, or visual changes, a filmstrip, load-performance breakdown, "what painted when", or how long each screen was shown.
UI/UX design intelligence. 50 styles, 21 palettes, 50 font pairings, 20 charts, 9 stacks (React, Next.js, Vue, Svelte, SwiftUI, React Native, Flutter, Tailwind, shadcn/ui). Actions: plan, build, create, design, implement, review, fix, improve, optimize, enhance, refactor, check UI/UX code. Projects: website, landing page, dashboard, admin panel, e-commerce, SaaS, portfolio, blog, mobile app, .html, .tsx, .vue, .svelte. Elements: button, modal, navbar, sidebar, card, table, form, chart. Styles: glassmorphism, claymorphism, minimalism, brutalism, neumorphism, bento grid, dark mode, responsive, skeuomorphism, flat design. Topics: color palette, accessibility, animation, layout, typography, font pairing, spacing, hover, shadow, gradient. Integrations: shadcn/ui MCP for component search and examples
Unirest-Java 3.x HTTP client library for Java 8+. Use when making HTTP requests (GET/POST/PUT/DELETE), building REST API clients, handling JSON responses, file uploads/downloads, async requests, mocking HTTP calls for testing, configuring proxies, or caching responses. Covers Unirest 3.x (Apache HttpClient based, default GSON included, kong.unirest package) with object mapping, request/response interceptors, and migration guidance.
Unirest-Java 4.x HTTP client library for Java 11+. Use when making HTTP requests (GET/POST/PUT/DELETE), building REST API clients, handling JSON responses, file uploads/downloads, async requests, Server-Sent Events (SSE), mocking HTTP calls for testing, configuring proxies, or caching responses. Covers Unirest 4.x (requires Java 11+, modular dependencies, kong.unirest.core package) with GSON/Jackson object mapping, request/response interceptors, and migration from Unirest 3.x.
Unity level design-to-code translation. Trigger & event architecture, encounter design contracts, checkpoint & respawn, cinematic & scripted sequences, environmental storytelling hooks, level streaming & loading seams. DESIGN INTENT format: INTENT/WRONG/RIGHT/SCAFFOLD/DESIGN HOOK. Based on Unity 6.3 LTS.
Unity physics query correctness patterns. Catches common mistakes with Raycast, SphereCast, OverlapSphere, NonAlloc allocation, LayerMask construction, trigger interaction, hit ordering, and query type selection. PATTERN format: WHEN/WRONG/RIGHT/GOTCHA. Based on Unity 6.3 LTS.
When a bug involves a named third-party library/framework, or symptoms correlate strongly with a platform/library-specific behavior, evaluate 'upgrade the dependency' BEFORE piling on local workarounds. Walks through a 4-step decision (is it upstream? → check Changelog/Release Notes → upgrade at low semver risk → only workaround if upgrade is infeasible), the upgrade engineering discipline (package-manager consistency, post-upgrade verification chain, semver risk, dedup check), and a result table. Use this skill whenever a bug smells like an upstream library issue — symptoms tied to a specific framework version, silent failures where code looks correct, workarounds that keep growing, or platform-specific rendering bugs that CSS cannot fix. Triggers — 「升级依赖」「依赖升级修复」「这个 bug 升级依赖能解决吗」「查 changelog 修复」「优先升级依赖」「升级依赖还是堆 workaround」 / dependency upgrade, upgrade to fix bug, changelog fix, avoid workaround, upgrade library to fix.
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
Route Three.js and browser game-development requests into the narrowest matching sub-skill of the 19-skill MengTo/Skills game-development family — level authoring, map editing, cameras, enemy systems and AI, monster rigs, action combat, encounter design, inventory, hybrid/Vesperfall assets, VFX, audio feedback, mobile controls, performance tuning, QA, changelogs, and release. Use when a task touches any of those for a playable web game, and fetch the matching sub-skill before doing the work instead of improvising. Route Unity/C# engine work to `unity-gamedev-skill-pack` instead. Triggers on: three.js game, browser game, webgl game, isometric arpg, enemy AI, game camera, game inventory, game VFX, game audio feedback, ship web game, playtest web game, mobile threejs game, game encounter design, monster rig, hybrid game assets.
Generates an interactive bash wizard that walks a human through steps only they can perform. Use when provisioning infrastructure, setting up CI credentials or secrets, navigating an unfamiliar third-party dashboard, or running a one-off migration/cutover. Do not invoke for steps the agent itself can perform.
Bootstrap a genuinely greenfield web, mobile, desktop, API, or daemon project from scratch — gather requirements, research current technologies, approve the design, collision-check the target, and scaffold app-local code with shared packages only when needed. An explicitly selected GitHub Project may retain the approved design.
WordPress performance code review and optimization analysis. Use when reviewing WordPress PHP code for performance issues, auditing themes/plugins for scalability, optimizing WP_Query, analyzing caching strategies, checking code before launch, or detecting anti-patterns, or when user mentions "performance review", "optimization audit", "slow WordPress", "slow queries", "high-traffic", "scale WordPress", "code review", "timeout", "500 error", "out of memory", or "site won't load". Detects anti-patterns in database queries, hooks, object caching, AJAX, template loading, and editor-side performance.
Design, build, refactor, or review polished responsive analytics dashboards, SaaS admin dashboards, business intelligence interfaces, and data-heavy product UI using Yafa-UI. Covers sidebar navigation, one-row page headers, multi-color KPI cards, charts, tables, filters, Lucide icons, accessible states, and mobile dashboard layouts across React, Next.js, Tailwind CSS, Vue, Svelte, and other frontend stacks. Do not use this visual system as the default for marketing sites, authentication, setup wizards, account or billing settings, or unrelated public pages.
Use to orchestrate a specific ticket set, issue tracker filter, project, delivery scope, or Linear Backlog clear run by selecting startable issues, delegating workers, calling review and integrate steps, updating tracker state, and stopping when no safe workflow action remains.
ABC medical cloud API documentation query tool. Reads and queries the OpenAPI specification documents of ABC APIs (5000+ endpoints), supports searching by module, path and method, and automatically resolves $ref references. Uses a cache structure split by module for fast queries. Use cases: (1) query API endpoint definitions (2) search for endpoints of a specific feature (3) query Schema definitions (4) view endpoint statistics
Delegate real coding work to a peer AI agent (such as Claude Code, Codex (ChatGPT), or Gemini (Antigravity)) that runs its own full harness, or use that peer as an independent reviewer, adversarial red-team, ideation & planning partner. Trigger when the user says "use agent bridge", "ask <another agent>", "delegate to <agent>", "have <agent> implement/build/fix this", "get <agent> to review/critique", "get a second opinion", or otherwise hands work to a different agent than the one they're talking to. The bridge auto-detects which agent you are and offers the others as peers, so the same instructions work whichever agent you are running inside. Do NOT trigger for normal work the user wants you to do yourself.
USE to guide an AI agent or CLI tool through adding Agnost AI analytics to a customer Python or TypeScript app from this installed skill directory. Inspect existing telemetry first, preserve a supported OTel path when it produces usable AI spans, otherwise use Agnost SDK/MCP packages, then verify the real conversation data model end to end.
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.