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QuantConnect's official CLI drives the open-source LEAN engine locally or in the cloud to download data, backtest and optimize quant strategies and deploy them live. Requires a paid-tier QuantConnect organization; strategies in Python or C#; local runs need Docker. Get expert review.

Official Readwise skills: triage your Reader queue, skim feeds, quiz you on what you just read, and draft book reviews and reading recaps from your highlights. Needs a Readwise subscription (30-day free trial) and the Readwise MCP or CLI installed first.

Postman's official MCP server: lets agents manage workspaces, collections, environments and API specs, help with API testing and generate client code from API definitions. The remote version uses OAuth; the local version needs a Postman API key.

Adobe's official Claude Code plugin for redesigning an existing website: crawls the current site, sets a design direction, builds prototypes, then migrates page by page to static HTML, checking performance, SEO and accessibility. Requires the impeccable plugin, Node 22 and Playwright.

Crowdin's official CLI: push source files and pull translations back in place, track progress, manage glossaries and TM, and run machine or AI pre-translation, with JSON output for agents. Needs a Crowdin account (free trial; free for open source) and a token; crowdin init sets up config.

Cross-platform UI automation skills built on Midscene.js visual recognition: control browsers, desktops, Android, iOS and HarmonyOS devices in natural language, and set up Vitest + Midscene E2E tests. Bring your own vision model API key; maintained by the Midscene team.

Hugging Face's official MCP server: lets agents search models, datasets and Spaces on the Hub and call thousands of Gradio AI apps directly. Hosted remotely; sign in with your Hugging Face account or authorize with a token.

Lets agents search Wikipedia and read full articles, summaries, specific sections and related articles, useful for lesson prep, homework help and fact-checking. English Wikipedia by default; pass --language to use another edition. No account; needs uv (Python).

The Dart team's official MCP server (dart mcp-server): analyze project errors, search pub.dev and manage dependencies, connect to running Flutter apps for hot reload, and read runtime errors and the widget tree. Needs Dart 3.9+; still experimental.

Alibaba Cloud's official agent skills: ECS diagnosis and DR, RDS/PolarDB database checks, PAI training and EAS deployment, ACK clusters, RAM permissions, OSS and network troubleshooting, and Model Studio. Needs an AccessKey or aliyun CLI credentials.

MasterGo's official MCP: reads design DSL data, SVGs and text from MasterGo files to help agents turn designs into front-end code. Needs a MasterGo personal access token; only works with Team plan or higher and files in team projects.

Works in the OKLCH color space for web projects: converts hex, rgb and hsl to oklch, generates palettes and dark-mode scales without hue drift, checks APCA and WCAG contrast and fixes it via lightness, handles P3 gamut fallbacks, and themes Tailwind v4.

Firecrawl's official plugin: brings the Firecrawl CLI in as skills so Claude Code can search the web, scrape pages to Markdown, map site links or crawl whole sites. Install firecrawl-cli and set an API key first; self-hosting supported.

Renders a component anatomy annotation in Figma: numbered markers on an instance with an attribute table, plus a section per sub-component listing its internal elements, hidden ones included. Part of uSpec; needs the .md spec from create-component-md, a Figma MCP and a configured template.

Renders a screen reader spec for a component directly in Figma: focus order plus per-state VoiceOver (iOS), TalkBack (Android) and ARIA (Web) property tables and announcements. Part of uSpec; reads the component .md spec from create-component-md and needs a Figma MCP and a configured template key.

i18next's official CLI: finds hard-coded strings in JS/TS code, extracts translation keys, checks which locales are missing entries and syncs locale files; init --yes sets up non-interactively, and a bundled agent skill guides app internationalization. Needs a Node.js project using i18next.

Nulab's official Backlog MCP: lets agents manage Backlog projects, issues and comments, milestones and wikis, and view Git repositories and pull requests. Needs your Backlog space URL and a personal API key, plus Node.js or Docker.

Searches Taiwan's court judgments, national laws database and Constitutional Court interpretations, with full texts, amendment history and citation links. Public government sources only, no account; needs Python and pipx. Unofficial: have a lawyer check results against official texts.

MinerU's official MCP: parses PDF, Word, PowerPoint and images into Markdown via the mineru.net cloud API, keeping tables and formulas. The keyless Flash mode works out of the box; add a token for higher quotas and more formats.

Comet's official Opik MCP: query traces and spans of LLM apps in chat, log scores and comments, and manage datasets, experiments and prompt versions. Works with Opik Cloud (API key or browser sign-in) and self-hosted open-source Opik.

Designs or restyles web UIs in a neo-industrial, editorial-brutalist style: sets a mode, one dominant gesture, a grid and a single accent color, builds type hierarchy and layout from macro to micro, and reviews the rendered page at desktop and phone widths.

Diagnoses page-load and interaction performance from Chrome DevTools traces, network evidence and source code, covering Core Web Vitals, LCP and layout shifts. Separates measured values from estimates and hypotheses, and re-measures fixes under equivalent conditions.

16 official Firecrawl skills that turn web scraping into deliverables: competitor pricing and feature tracking, market and industry reports, pre-meeting account research, lead lists, SEO audits and literature reviews. Needs a Firecrawl API key plus its CLI or MCP.

Implements, debugs or audits how a website behaves on iPhone and iPad in Safari or added to the Home Screen, and on Mac when added to the Dock: safe areas, status and address bar tinting, theme color, overlays, keyboard, manifest, icons, splash screens and installed navigation.