Tools

Community plugin marketplace bundling hundreds of subagents, slash commands, hooks and skills by category, installable individually or all at once, with the buildwithclaude.com site for browsing community plugins and MCP servers.

Finance skills for investment research: pulls quotes and financials via yfinance for DCF valuation, earnings previews and recaps, option payoff charts, and correlation and liquidity analysis, plus read-only feeds from Twitter, Discord and more. For research reference only.

Plugin marketplace for investment research: six plugin groups covering yfinance market data, earnings previews and recaps, DCF valuation, option payoff charts, ETF premiums, read-only news from X, Discord and other social sources, and TradingView data. Research only, not investment advice.

AWS's official skills (Agent Toolkit for AWS) covering IAM, CDK/CloudFormation, serverless, containers, observability, cost management and Bedrock, plus service-specific skills. Running AWS operations requires locally configured credentials.

AWS's generally available agent toolkit and plugin marketplace: plugins such as aws-core, aws-agents and aws-data-analytics bundle the AWS MCP Server with evaluated skills for IaC, serverless, containers and billing. Calling AWS APIs requires configured credentials.

Cloudflare's official overview skill: recommends platform products such as Workers, R2, D1, Durable Objects, Containers and AI for your needs, then loads the matching sub-skills and docs. The same repo has dedicated skills for Wrangler, the Agents SDK and more.

Teaches agents to build, debug and review stateful AI agents with the Cloudflare Agents SDK: state sync, scheduled tasks, RPC, MCP servers, email and streaming chat, checking the latest official docs first. Maintained by Cloudflare.

Cloudflare's official skills with build and deploy guidance for Workers, Wrangler, Durable Objects, the Agents SDK, Sandbox, Email Service and Cloudflare One; the plugin version also bundles the official MCP.

Cloudflare's official plugin with skills for Workers, Durable Objects, the Agents SDK, Wrangler, Sandbox and web performance audits, plus the Cloudflare API MCP for account data and up-to-date docs.

Testing practices for Vue apps: Vitest and Vue Test Utils, black-box component tests, flushPromises for async code, helpers for testing composables, Pinia stores, async components and Teleport, avoiding snapshot-only tests, and Playwright for end-to-end testing.

Lets agents write and run Playwright scripts on the fly for browser automation: page tests, UX checks and multi-step flows, opening a visible browser by default and auto-detecting local dev servers. After installing the plugin, run npm run setup in the skill directory.

Lets agents write and run Playwright scripts on the fly for browser testing and automation, auto-detecting local dev servers, with screenshots, responsive checks, login flows and link checking. After installing, run npm run setup in the skill directory.

Search and download arXiv papers and read the authors' LaTeX source section by section, export BibTeX and follow topic updates, with papers cached locally. No API key needed.

Reviews mobile and desktop app designs against Apple's Human Interface Guidelines, bundled as 123 pages from developer.apple.com, citing the exact guideline through five review lenses, and flags generic, templated choices. Works on screenshots, mockups or code for SwiftUI, Flutter or Electron.

Pluggable natural-language linter that checks Markdown and plain text for wording, punctuation and terminology consistency like code, with auto-fix, and can also run as an MCP server. Rules are installed separately, mostly for Japanese and English; requires Node.js 20+.

MCP server built into the textlint proofreader: agents check Markdown, plain text and other documents against your rules for wording, punctuation and formatting issues and get auto-fixed text. Needs Node.js plus a .textlintrc and rule packages in your project; textlint has no default rules.

Microsoft's official skill collection: 170+ skills focused on Azure SDKs (Python, .NET, TypeScript, Java, Rust) and Microsoft Foundry development, plus plugins, custom agents and MCP configs. Microsoft recommends picking skills per project rather than installing them all.

Official plugin from the Dart and Flutter teams that installs Flutter skills and the Dart MCP server together, covering layered architecture, responsive layouts, layout error fixes, widget and integration tests, routing and internationalization. Requires the Dart/Flutter SDK locally.

Agent skills maintained by the Flutter team: layered architecture, responsive layouts, fixing layout overflows, declarative routing, internationalization, JSON serialization, and widget and integration tests. Works alongside the Dart MCP server.

Standards-based command-line calendar that syncs iCloud and other CalDAV calendars via vdirsyncer, so agents can query your schedule and quickly add events; also has an interactive UI. Setting up vdirsyncer takes some technical effort; no Windows support.

Unified search across 20+ academic sources including arXiv, PubMed, bioRxiv, Semantic Scholar and OpenAlex, returning deduplicated, normalized results and downloading full text via open-access channels first. Most sources need no API key.

Measurement-first audits and optimization of web quality using Lighthouse, Chrome DevTools performance traces and CrUX data, covering Core Web Vitals, WCAG 2.2 accessibility, SEO and best practices, for any frontend framework. By Addy Osmani (not an official Google project).

Supabase's official general skill covering the database, Auth, Edge Functions, Realtime, Storage, vectors and queues, plus supabase-js/SSR integration, the CLI and MCP, migrations and RLS security checks, and it checks the latest docs and changelog before acting.

Postgres rules ranked by impact: query optimization, indexing, connection pooling, RLS security, schema design and lock troubleshooting, with wrong-vs-right SQL examples, applicable to any Postgres. Maintained by Supabase.