Skill rating

Mermaid turns short text definitions into diagrams (flowcharts, sequence, ER, class, state, Gantt, C4 and architecture diagrams) that render in Markdown on GitHub, GitLab and docs sites. Use when a us

Encodes and decodes MessagePack, a compact binary serialization format that carries the same data types as JSON plus raw bytes and timestamps. Use when someone asks to "replace JSON with MessagePack",

Create, read, and manage OneNote notebooks, sections, and pages via Microsoft Graph API. Use when someone asks to "create OneNote pages", "read OneNote notes", "automate OneNote", "save to OneNote", "

PostHog is an open-source product analytics platform: event tracking, funnels, retention, session replay, feature flags and experiments in one tool, on PostHog Cloud or self-hosted. Use when someone a

Segment is a customer data platform (CDP) that collects events from your website, apps and servers once and routes them to analytics, marketing and warehouse destinations. Use when someone asks to "tr

Zustand is a small state-management library for React: a store is a hook, components subscribe to slices of it with selectors, and no context provider is needed. Use when a user asks to "add a Zustand

The Vercel AI SDK is a TypeScript toolkit for calling LLMs from Node.js, Next.js, Nuxt, SvelteKit and edge runtimes through one API. It covers text generation, streaming, structured output with Zod, t

Write CI/CD pipelines as code with Dagger — portable, cacheable, container-based pipelines that run locally and in any CI system. Use when someone asks to "write CI pipeline in TypeScript", "portable

Hotjar adds heatmaps, session recordings, surveys and feedback widgets to a website so you can see how visitors actually use it. Covers installing the tracking snippet or the @hotjar/browser package,

Lint JavaScript/TypeScript at blazing speed with oxlint — a Rust-based linter 50-100x faster than ESLint. Use when someone asks to "speed up linting", "oxlint", "fast JavaScript linter", "replace ESLi

PDFKit is a JavaScript library that generates PDF files in Node.js and the browser, with text, images, vector graphics, tables, custom fonts and streaming output. Use when asked to "generate a PDF wit

PGlite is Postgres compiled to WebAssembly: a real Postgres 18 database that runs inside the browser, Node.js, Bun or Deno with no server, in-memory or persisted to IndexedDB or a folder. Use when som

Prisma ORM is a TypeScript database toolkit with a declarative schema, a generated type-safe client, and a migration system for PostgreSQL, MySQL/MariaDB, SQLite, SQL Server, CockroachDB and MongoDB.

Resend is an email API for developers: send transactional and marketing email from Node.js, Python and other SDKs, with React Email templates, webhooks for delivery events, batch sending and contact b

Valtio is a proxy-based state library for React: wrap an object in proxy(), mutate it like plain JavaScript, and components that read it through useSnapshot re-render only for the properties they used

Atuin replaces your shell history file with a searchable SQLite database that records directory, exit code, duration and host for every command, and can sync it end-to-end encrypted between machines.

Detox is a gray-box end-to-end testing framework for React Native apps: it runs Jest tests against the app on an iOS simulator or Android emulator and waits for the app to go idle before each step. Us

Run Python functions on cloud GPUs and CPUs with Modal, a serverless platform that builds containers from Python code, scales to zero and bills per second. Use when a user asks to "run this on a GPU",

Orama is an in-process search engine for JavaScript and TypeScript: full-text, vector and hybrid search that runs in the browser, on a server or at the edge with no external service. Use when someone

rsync copies and synchronizes files locally or over SSH, sending only the parts that changed. Use when someone asks to "copy files to a server", "sync two directories", "mirror a folder", "make increm

Ably is a hosted realtime messaging service: clients publish and subscribe to named channels over WebSockets, see who is present, replay message history, and resume after a dropped connection. Use whe

The docx library generates Word (.docx) files from Node.js or the browser in code, with no Word installation: paragraphs, tables, images, headers, footers, page numbers and numbered or bulleted lists.

Drei (@react-three/drei) is the helper library for React Three Fiber with ready-made 3D components: orbit controls, environment lighting, text, HTML overlays, model and texture loaders, instancing and

Find and remove unused files, dependencies, and exports in JavaScript/TypeScript projects with Knip. Use when someone asks to "find unused code", "clean up dependencies", "remove dead code", "find unu

Bundle TypeScript libraries with tsup — zero-config, powered by esbuild. Use when someone asks to "bundle a TypeScript library", "build npm package", "tsup", "publish TypeScript to npm", "build ESM an

Xano is a no-code/low-code backend platform for building REST APIs, a PostgreSQL database and user authentication without server code. Use when someone asks to "build a backend with Xano", "create a X

DVC (Data Version Control) tracks large datasets and models next to Git, builds reproducible ML pipelines and compares experiments. Use when the user says "version my dataset", "dvc add", "dvc repro",

Plans a minimum viable product: states what the first release must teach, picks the cheapest form that can teach it (hand-delivered service, assembled tools or a single coded flow), budgets capacity i

Guides building a feature or fixing a bug test-first with the red-green-refactor cycle: agree a list of behaviours, write one failing test, make it pass with the least code, tidy up while green, repea

WXT is a Vite-based framework that builds browser extensions for Chrome, Firefox, Safari, and Edge from one codebase. Use when someone asks to "build a browser extension", "Chrome extension with React

Material UI (@mui/material) is a React component library that implements Google's Material Design, with ready-made buttons, forms, dialogs, tables, layout grids and a theming system. Use this skill to

Ant Design (antd) is a React component library of 70+ enterprise UI components (tables, forms, date pickers, modals, menus) with design-token theming through ConfigProvider. Use it to build admin pane

Converts PDF, Word, Excel, PowerPoint, HTML, CSV, EPUB, ZIP and other files into Markdown text that language models and search indexes can read. Use when a user asks to convert a document to Markdown,

Sets up and repairs TypeScript projects: picks tsconfig.json settings for a Node.js service, an npm library or a bundled web app, runs type-checking in CI, and replaces `any` and unsafe casts with typ

Fetches web pages and extracts structured data from them with Python, from a single HTTP request to a full crawl, including pages rendered by JavaScript and selectors that keep working after a site re

Context7 fetches current, version-specific documentation and code examples for software libraries and hands them to an AI coding agent, so generated code matches the library version in use instead of

Spec Kit is GitHub's open-source toolkit that installs a set of agent commands into a project so a coding agent builds features from a written specification: specify, plan, tasks, implement, then conv

Unsloth fine-tunes open LLMs such as Llama, Qwen and Gemma with LoRA or QLoRA about twice as fast and with far less GPU memory than a stock Hugging Face setup, then exports the result to GGUF for Olla

Go is Google's open-source programming language whose toolchain compiles programs into single static binaries and ships with built-in modules, testing, fuzzing, race detection and cross-compilation. U

Builds and debugs React user interfaces: components, state, effects, forms and data loading, written the way React 19 expects. Use when someone asks to "create a React app", "build a React component",

Rust is a compiled, memory-safe systems programming language whose toolchain (rustup, rustc, Cargo, Clippy, rustfmt) builds, tests, lints and packages code. Use this skill to install or pin a Rust too

Exposes a web page's functionality to AI agents as callable tools with WebMCP, a draft browser API (document.modelContext) from the W3C Web Machine Learning Community Group. Use when a user asks to "m

Adds animated, interactive React components from the React Bits library (split-text effects, shader and aurora backgrounds, cursor effects, animated cards and micro-interactions) to a project by copyi

Discord is a chat platform whose bot API lets programs read events, answer slash commands and post messages in servers. Use this skill to create a Discord application and bot, choose gateway intents,

AirLLM runs very large open language models on a small GPU (or a CPU) by loading the model one layer at a time from disk instead of holding it all in memory, at the price of slow generation. Use when

Checks English spelling and grammar locally, in milliseconds, without sending text to any server, using the Harper command-line linter (harper-cli) and language server (harper-ls). Use when a user wan

VCR.py records the HTTP calls a Python test makes into a cassette file and replays them on later runs, so tests that depend on third-party APIs become fast, offline and deterministic. Use when the use

ECC (Everything Claude Code) is an open-source toolkit that adds agents, skills, slash commands, rules, hooks and a shared memory vault to coding agents such as Claude Code and Codex. Use it when a us

Parse architectural drawings, floor plans, and building code compliance documents using Vision AI. Extracts building type, occupancy, floor areas, room layouts, dimensions, and code parameters. Use wh

React Native Reanimated is an animation library for React Native that runs animations on the UI thread through worklets and shared values, so they stay smooth while the JavaScript thread is busy. Use