Skills
97,725 packaged capabilities and playbooks for agents. Install any of them with one command.
Development
Adapt a game to iPhone Duo—fill the screen in every device pose, lock orientation, handle aspect ratio versus letterboxing, keep touch controls out of the fold, and maintain consistent text and control sizes while resizing. Use when the project is a game or uses a game engine such as Unity, Unreal, Godot, SpriteKit, or Metal
Reference for the Opik SDK — tracing, span types, framework integrations, threads, and the prompt library (Python, TypeScript, REST). Use for questions like "what span types exist", "how do I flush", "track_openai", "add OpikTracer", "version a prompt". To instrument a repo end to end, use the opik-instrument skill.
Write, rewrite, or refresh an AGENTS.md (repo root or one package/module) from the actual codebase — Always / Ask First / Never / Validation Commands rules, task checklists, real paths and commands. Follows a repo template when present, else a built-in default. Use for "write AGENTS.md for this package", "rewrite our AGENTS.md", "refresh AGENTS.md".
Grounded gap analysis of requirements against the platform an app builds on — client docs become an Epic/Story tree whose every coverage verdict is re-run by executable gates against a validated platform checkout, scored in atomic commits, license-tier-tagged, summarized with a backlog. Use for "gap analysis", "what does the platform already cover".
Comprehensive validation patterns for ASP.NET Core applications. Covers FluentValidation integration, DataAnnotations, IValidatableObject, IValidateOptions<T>, MediatR pipeline behavior, and client-side validation. Use when implementing validation in ASP.NET Core applications, setting up FluentValidation, creating custom validators, configuring options validation, or implementing cross-field validation.
Tools are how AI agents interact with the world. A well-designed tool is the difference between an agent that works and one that hallucinates, fails silently, or costs 10x more tokens than necessary. This skill covers tool design from schema to error handling. JSON Schema best practices, description writing that actually helps the LLM, validation, and the emerging MCP standard that's becoming the lingua franca for AI tools. Key insight: tool descriptions are more important than tool implementations.
Guides Metronome usage-based billing integration decisions — event ingestion (single and batch, idempotency, billable metrics), contract design (rate cards, overrides, dimensional pricing, products), invoicing lifecycle (grace periods, finalization, Stripe sync), credit and commit management (prepaid, postpaid, thresholds, auto-recharge), and Stripe integration (arrears invoicing, tax providers, line item limits). Use when building, modifying, or reviewing any Metronome integration — including ingesting usage events, creating customers, contracts, or rate cards, designing billable metric group keys, managing credits and commits, configuring invoicing, syncing invoices with Stripe Billing, billing AI applications for token usage, setting up self-serve (PLG) pricing, reviewing customer health, commit burn, portfolios, or renewals, or migrating from Stripe Billing Meters to Metronome.
Generate a Product Requirements Document (PRD) for a new feature. Use when planning a feature, starting a new project, or when asked to create a PRD. After PRD is confirmed, use /prd-to-spec (optional) for technical design, then /to-issues to create implementable tickets. Triggers on: create a prd, write prd for, plan this feature, requirements for, spec out, 写PRD, 需求文档, 需求分析, 规格说明.
Guidelines for organizing .NET projects, including solution structure, project references, folder conventions, .slnx format, centralized build properties, and central package management. Use when setting up a new .NET solution with modern best practices, configuring centralized build properties across multiple projects, implementing central package version management, or setting up SourceLink for debugging.
WebAssembly with Emscripten skill for C/C++ to WASM compilation. Use when compiling C/C++ to WebAssembly with emcc, configuring EXPORTED_FUNCTIONS, understanding the WASM memory model, using Asyncify for async C code, debugging .wasm with browser devtools or wasm-opt, or targeting WASI vs browser environments. Activates on queries about Emscripten, emcc, WebAssembly from C/C++, WASM memory model, Asyncify, EXPORTED_FUNCTIONS, WASI, or wasm-opt.
Guides development of Fastify Node.js backend servers and REST APIs using TypeScript or JavaScript. Use when building, configuring, or debugging a Fastify application — including defining routes, implementing plugins, setting up JSON Schema validation, handling errors, optimising performance, managing authentication, configuring CORS and security headers, integrating databases, working with WebSockets, and deploying to production. Covers the full Fastify request lifecycle (hooks, serialization, logging with Pino) and TypeScript integration via strip types. Trigger terms: Fastify, Node.js server, REST API, API routes, backend framework, fastify.config, server.ts, app.ts.
Provides domain-specific best practices for Node.js development with TypeScript, covering type stripping, async patterns, error handling, streams, modules, testing, performance, caching, logging, and more. Use when setting up Node.js projects with native TypeScript support, configuring type stripping (--experimental-strip-types), writing Node 22+ TypeScript without a build step, or when the user mentions 'native TypeScript in Node', 'strip types', 'Node 22 TypeScript', '.ts files without compilation', 'ts-node alternative', or needs guidance on error handling, graceful shutdown, flaky tests, profiling, or environment configuration in Node.js. Helps configure tsconfig.json for type stripping, set up package.json scripts, handle module resolution and import extensions, and apply robust patterns across the full Node.js stack.
Audit a spec before implementation — readiness gate, backward-compatibility check against BACKWARD_COMPATIBILITY.md, completeness, repo-rule compliance, risks, gaps — and leave a go/conditional/no-go report with a remediation plan. Read-only. Use for "is this spec ready", "pre-implement", "spec readiness", "BC analysis", "spec gap analysis".
Integrates Sanity Live with Next.js Cache Components in next-sanity v13+ apps. Sets up sanityFetch, a shared cachedSanity 'use cache' boundary, <SanityLive>, Visual Editing, Presentation Tool, draft mode handling, and the three-layer (Page/Dynamic/Cached) component pattern with explicit perspective/stega prop-drilling. Sequences with the official Next.js skills (next-cache-components-adoption, next-cache-components-optimizer, next-partial-prefetching-adoption, next-dev-loop). Use when configuring or migrating a Next.js app to cacheComponents with Sanity, when adding sanityFetch, when wiring <SanityLive>/<VisualEditing>, or when refactoring components that hardcode perspective/stega.
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
Web performance audits with Core Web Vitals, bottleneck identification, optimization recommendations. Use for page load times, performance reviews, UX optimization, or encountering LCP, FID, CLS issues, resource blocking, render delays.
This skill helps with GitHub Copilot SDK work across Node.js/TypeScript, Python, Go, .NET, and Java. It covers setup, authentication, permissions, streaming events, custom tools, custom agents, MCP servers, hooks, skills, and session persistence.
Design app, admin, and game interfaces as well as complete website landing pages, generating UI design mockups; restore designs or screenshots into HTML/CSS, existing frontend projects, or WeChat mini programs as needed. Use when users request page design, complete landing pages, screenshot restoration, or high-fidelity mini programs. Not for ordinary illustration, posters, storyboards, pure image editing, or business code changes without design tasks.
Build acceleration skill for C/C++ projects. Use when reducing compilation times with ccache, sccache, distcc, unity builds, precompiled headers, split DWARF, or IWYU. Covers caching strategies, distributed compilation, link time reduction, and diagnosing build bottlenecks. Activates on queries about slow builds, ccache, sccache, precompiled headers, unity builds, split-DWARF, or reducing C++ compile times.
Expert blueprint for signal-driven architecture using "Signal Up, Call Down" pattern for loose coupling. Covers typed signals, signal chains, one-shot connections, and AutoLoad event buses. Use when implementing event systems OR decoupling nodes. Keywords signal, emit, connect, CONNECT_ONE_SHOT, CONNECT_REFERENCE_COUNTED, event bus, AutoLoad, decoupling.
Adapt a Flutter app to iPhone Duo, Apple's first foldable iPhone: what MediaQuery gives you today, why displayFeatures does not work here, and how to bridge the iOS 27.1 reserved-region, hinge, and arrangement APIs through platform channels. Use when a Flutter or Dart app needs foldable iPhone support.
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.