> browse/registry

> yup

Validate data with Yup schemas. Use when adding form validation, defining API request schemas, validating configuration, or building type-safe validation pipelines in JavaScript/TypeScript.

> web-vitals-analyzer

Analyze and optimize Core Web Vitals (LCP, CLS, INP) and frontend performance. Use when a user asks to improve page speed, fix layout shifts, reduce loading times, analyze Lighthouse reports, optimize bundle size, or improve Google PageSpeed scores. Covers image optimization, code splitting, font loading, render-blocking resources, and JavaScript execution costs.

> htmx

htmx gives you access to AJAX, CSS transitions, WebSockets, and Server-Sent Events directly in HTML using attributes. It enables dynamic web UIs without writing JavaScript by letting any element issue HTTP requests and swap content into the DOM.

> biome

You are an expert in Biome, the Rust-based toolchain that replaces ESLint and Prettier with a single, fast tool. You help developers configure linting, formatting, and import sorting for JavaScript, TypeScript, JSX, JSON, and CSS — achieving 100x faster execution than ESLint+Prettier with zero configuration, unified diagnostics, and IDE integration.

> amqplib

You are an expert in amqplib, the Node.js client for RabbitMQ and AMQP 0-9-1 protocol. You help developers implement reliable message queuing with work queues, pub/sub fanout, topic routing, RPC patterns, dead letter queues, and message acknowledgment — building decoupled microservices that communicate asynchronously through RabbitMQ.

> renovate

Assists with automating dependency updates across JavaScript, Python, Docker, Go, Rust, Terraform, and 50+ ecosystems using Renovate. Use when configuring update strategies, automerge policies, grouping rules, or scheduling to keep dependencies current. Trigger words: renovate, dependency updates, automerge, package rules, dependency management.

> crawl4ai

You are an expert in Crawl4AI, the open-source web crawler built for AI applications. You help developers extract clean, structured data from websites for LLM training, RAG pipelines, and content analysis — with automatic markdown conversion, JavaScript rendering, CSS-based extraction, LLM-powered structured extraction, and session management for multi-page crawling.

> cassandra

Apache Cassandra is a distributed NoSQL database designed for high availability and linear scalability. Learn CQL (Cassandra Query Language), data modeling with partition keys, replication strategies, and integration with Node.js using the DataStax driver.

> fastify

Fastify is a high-performance Node.js web framework focused on developer experience and low overhead. It features JSON Schema validation, a powerful plugin system, lifecycle hooks, and automatic serialization for blazing-fast APIs.

> happy-dom

Run DOM tests without a browser using Happy DOM — fast JavaScript DOM implementation. Use when someone asks to "test without a browser", "Happy DOM", "fast DOM environment for tests", "replace jsdom", "Vitest DOM environment", or "server-side DOM". Covers test environment setup, Vitest/Jest integration, SSR testing, and performance comparison with jsdom.

> graphql-yoga

You are an expert in GraphQL Yoga, the batteries-included GraphQL server by The Guild. You help developers build production GraphQL APIs with schema-first or code-first approaches, file uploads, subscriptions, Envelop plugin system, response caching, error masking, and deployment to any JS runtime (Node.js, Deno, Bun, Cloudflare Workers, AWS Lambda) — the modern alternative to Apollo Server.

> hono

You are an expert in Hono, the ultrafast web framework for the edge. You help developers build APIs and web applications that run on Cloudflare Workers, Deno, Bun, Node.js, AWS Lambda, and Vercel Edge — with a tiny footprint (~14KB), middleware ecosystem, JSX support, RPC client, and Web Standards API compatibility that makes code truly portable across runtimes.

> echarts

Create interactive data visualizations with Apache ECharts. Use when a user asks to build charts, dashboards, or data-driven graphics using ECharts in React, Vue, or vanilla JavaScript applications.

> mysql

MySQL is the world's most popular open-source relational database management system. Learn installation, SQL queries, indexing strategies, replication setup, and client integration with Node.js (mysql2) and Python (mysql-connector).

> adonisjs

Build full-stack web applications with AdonisJS — a batteries-included Node.js framework with ORM, auth, validation, and mailer built-in. Use when someone asks to "build a web app with Node.js", "Laravel for Node.js", "full-stack Node framework", "AdonisJS", "batteries-included backend", or "Node.js with built-in ORM and auth". Covers Lucid ORM, auth (sessions, tokens, social), VineJS validation, Edge templates, and deployment.

> go-fiber

You are an expert in Fiber, the Express.js-inspired web framework for Go built on top of Fasthttp. You help developers build high-performance APIs and web services using Fiber's familiar routing, middleware system, template rendering, WebSocket support, and zero-allocation design — achieving top-tier performance while maintaining the developer experience Go developers love from Express/Koa in Node.js.

> foundry

You are an expert in Foundry, the blazing-fast Ethereum development toolkit written in Rust. You help developers write, test, deploy, and debug Solidity smart contracts using Forge (testing), Cast (CLI interactions), Anvil (local node), and Chisel (Solidity REPL) — with native Solidity testing (no JavaScript), fuzz testing, gas optimization, and fork testing against mainnet state.

> locust

When the user wants to perform load testing using Python with Locust's distributed architecture and real-time web UI. Also use when the user mentions "locust," "Python load testing," "distributed load test," "locust web UI," or "locustfile." For JavaScript-based load testing, see k6 or artillery.

> deno

Assists with building secure JavaScript and TypeScript applications using the Deno runtime. Use when creating servers, CLI tools, or scripts with Deno's built-in tooling, permission model, and web standards APIs. Trigger words: deno, deno deploy, deno serve, deno kv, deno permissions, secure runtime, jsr.

> pipedream

You are an expert in Pipedream, the workflow automation platform built for developers. You help teams build event-driven integrations connecting 2,000+ apps using Node.js/Python code steps, pre-built triggers, and managed auth — with built-in key-value store, queues, and HTTP endpoints for complex automation that goes beyond simple no-code tools.