MCP server MIT
Sequential Thinking MCP Server
by Model Context Protocol
Reference MCP server with one tool for step-by-step reasoning that can revise and branch thoughts.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Any MCP client
Skills · plugins · MCP · rules114 official
MCP servers, skills, plugins and rules for AI coding agents
Extensions are the things you plug into an AI coding agent: MCP servers that give it tools and data, skills and plugins that package workflows, and rules files that set how it should behave in a repository. This index covers 116 of them, each documented from its official repository or docs, with install steps, the permissions it asks for, and known limits.
Pick your host above to see what works with it: Claude Code has the widest set (84), followed by Cursor (32), Windsurf and OpenAI Codex (14 each) and Gemini CLI (9). MCP servers marked "any MCP client" run in all of them.
Claude Code84 extensions
OpenAI Codex14 extensions
Cursor32 extensions
Windsurf14 extensions
Gemini CLI9 extensions
GitHub Copilot1 extensions
Any MCP client46 extensions
Skill · 19Reusable instructions and scripts the agent loads for a taskAlgorithmic Art, brand-guidelines, Canvas Design…
Plugin · 42Bundles of skills, commands, hooks and agentsAgent SDK Development Plugin, C# LSP, clangd LSP…
MCP server · 49Connect the agent to tools, data and servicesApify MCP Server, Atlassian Rovo MCP Server, AWS API MCP Server…
Rules & instructions · 6Project instructions the agent reads every sessionAGENTS.md, CLAUDE.md, Cursor Rules…
116 extensions
Plugin Apache-2.0
Session Report
by Anthropic
Generates an explorable HTML report of Claude Code token, cache and subagent usage from local transcripts.
- Does
- 5 things
- Install
- 3 steps
- Works with
- Claude Code
MCP server ISC
Shopify Dev MCP
by Shopify
Shopify's local Dev MCP server: search Shopify docs and API schemas and validate GraphQL, Liquid and extension code.
- Does
- 5 things
- Install
- 5 steps
- Works with
- 4 hosts
skill-creator
by Anthropic
Create, edit and benchmark skills: draft, run test prompts, review results, and optimize descriptions for triggering.
- Does
- 4 things
- Install
- 4 steps
- Works with
- Claude Code
Skill Apache-2.0
Slack GIF Creator
by Anthropic
Toolkit and guidance for making animated GIFs that meet Slack size limits, built with Python and PIL.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Claude Code
MCP server MIT
Slack MCP Server (archived reference)
by Model Context Protocol
Archived reference Slack MCP server for channels, messages, threads and users; moved to servers-archived.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Any MCP client
Stripe MCP Server
by Stripe
Stripe's MCP server to call Stripe APIs from AI agents, hosted at mcp.stripe.com or run locally with npx.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Any MCP client, Gemini CLI
MCP server Apache-2.0
Supabase MCP Server
by Supabase Community
Connect Supabase projects to AI assistants to manage tables, fetch config and query data.
- Does
- 5 things
- Install
- 4 steps
- Works with
- 3 hosts
Plugin Apache-2.0
Swift LSP (SourceKit-LSP)
by Anthropic
Swift (SourceKit-LSP) language server for Claude Code: code intelligence and diagnostics for .swift files.
- Does
- 3 things
- Install
- 5 steps
- Works with
- Claude Code
MCP server MIT
Tavily MCP Server
by Tavily
Tavily MCP server: real-time web search, page extraction, site mapping and crawling for AI agents.
- Does
- 5 things
- Install
- 5 steps
- Works with
- 3 hosts
theme-factory
by Anthropic
Apply one of 10 preset font/colour themes (or a generated one) to slides, docs, reports or HTML pages.
- Does
- 4 things
- Install
- 4 steps
- Works with
- Claude Code
MCP server MIT
Time MCP Server
by Model Context Protocol
Reference MCP server for current time and timezone conversion using IANA timezone names.
- Does
- 4 things
- Install
- 4 steps
- Works with
- Any MCP client
Plugin Apache-2.0
TypeScript LSP
by Anthropic
TypeScript/JavaScript language server for Claude Code: code intelligence and diagnostics for .ts files.
- Does
- 3 things
- Install
- 4 steps
- Works with
- Claude Code
Vercel MCP
by Vercel
Vercel's official remote MCP server: search docs, manage projects and deployments, read logs and Web Analytics from your AI tool.
- Does
- 5 things
- Install
- 4 steps
- Works with
- 6 hosts
Skill Apache-2.0
Web Artifacts Builder
by Anthropic
Scripts and guidance to build multi-component React artifacts and bundle them into a single HTML file.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Claude Code
webapp-testing
by Anthropic
Toolkit for testing local web apps with Playwright: verify frontend behaviour, debug UI, capture screenshots and logs.
- Does
- 4 things
- Install
- 4 steps
- Works with
- Claude Code
Windsurf MCP
by Windsurf (Cognition)
Configure MCP servers for Windsurf's Cascade agent in mcp_config.json, with stdio, Streamable HTTP, SSE and admin allowlists.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Windsurf
Windsurf Rules and Memories
by Windsurf (Cognition)
Windsurf Cascade rules: global, workspace and enterprise rule files plus AGENTS.md support and auto-generated memories.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Windsurf
Zapier MCP
by Zapier
Zapier-hosted MCP server that lets Claude, Cursor and other clients take actions across 9,000+ apps with managed auth.
- Does
- 5 things
- Install
- 5 steps
- Works with
- 3 hosts
What is in the index
49 MCP servers, 42 plugins, 19 skills and 6 rules files. Each entry records the author (official vendor or community), the hosts it supports, the transport and authentication it needs, and whether it is maintained or deprecated.
MCP servers, skills, plugins and rules: the difference
An MCP server exposes tools and data over the Model Context Protocol and works in any host that speaks it. A skill or plugin is host-specific and bundles prompts, commands and sometimes an MCP server. A rules file (CLAUDE.md, AGENTS.md, .cursor/rules) is plain text the agent reads before working. The explainer on what an MCP server is goes deeper.
How entries are checked
We read the README, the install instructions and the permission list in the official repository and record them as stated. Deprecated or archived repositories are labelled. Community entries are marked as such and are not endorsed.
FAQ
Which hosts are covered?
Claude Code, Cursor, Windsurf, OpenAI Codex, Gemini CLI and GitHub Copilot, plus MCP servers that work in any MCP client.
Are these official?
Each entry says who published it. 114 of 116 come from the vendor or the official project; community entries are labelled.
Do I need an API key?
It depends on the extension. The entry lists the authentication it requires, such as an API key, OAuth or none.
How do I install an MCP server?
Each entry shows the install step for its hosts. The MCP servers hub has a comparison table by transport, auth and host.