116 documented

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…

MCP servers for Claude Code and Cursor Claude Code plugins and marketplace Claude Code skills Cursor rules What is an MCP server? A plain explanation for 2026

116 extensions

MCP server Apache-2.0

MongoDB MCP Server

by MongoDB

Official MongoDB MCP server: query and manage MongoDB databases and Atlas from an AI agent, with a read-only mode.

Does: 6 things
Install: 5 steps
Works with: 4 hosts

MCP server

n8n MCP Server Trigger

by n8n

n8n core node that turns a workflow into an MCP server exposing n8n tools to MCP clients.

Does: 5 things
Install: 5 steps
Works with: Any MCP client

MCP server MIT

n8n-MCP

by Romuald Czlonkowski

Community MCP server giving AI assistants n8n node docs, templates and workflow management tools.

Does: 4 things
Install: 4 steps
Works with: 5 hosts

MCP server MIT

Neon MCP Server

by Neon

Neon's official MCP server: manage Neon Postgres projects, branches, schemas and migrations, and run queries in natural language.

Does: 5 things
Install: 4 steps
Works with: 3 hosts

MCP server

Notion MCP Server

by Notion

Notion's local MCP server for the Notion API; the README now points to the hosted Remote Notion MCP instead.

Does: 5 things
Install: 4 steps
Works with: Any MCP client

Skill Proprietary (LICENSE.txt in skill folder

pdf

by Anthropic

Read, extract, merge, split, rotate, watermark, create, fill, encrypt and OCR PDF files.

Does: 3 things
Install: 4 steps
Works with: Claude Code

MCP server MIT

Perplexity API Platform MCP Server

by Perplexity

Official Perplexity MCP server: web search, quick answers, reasoning and deep research via the Perplexity API.

Does: 4 things
Install: 4 steps
Works with: 4 hosts

Plugin Apache-2.0

PHP LSP (Intelephense)

by Anthropic

PHP (Intelephense) language server for Claude Code: code intelligence and diagnostics for .php files.

Does: 3 things
Install: 4 steps
Works with: Claude Code

Plugin Apache-2.0

Playground

by Anthropic

Creates self-contained HTML playgrounds with controls, live preview and a copyable prompt output.

Does: 5 things
Install: 3 steps
Works with: Claude Code

MCP server

Playwright MCP

by Microsoft

Microsoft's MCP server for browser automation through Playwright accessibility snapshots, no vision model needed.

Does: 5 things
Install: 5 steps
Works with: 5 hosts

Plugin Apache-2.0

plugin-dev

by Anthropic

Toolkit with 7 skills and /plugin-dev:create-plugin for building Claude Code plugins.

Does: 4 things
Install: 4 steps
Works with: Claude Code

MCP server

Postgres MCP Pro

by Crystal DBA

Postgres MCP server with index tuning, explain plans, health checks and a restricted read-only mode.

Does: 5 things
Install: 4 steps
Works with: Any MCP client

MCP server MIT

PostHog MCP

by PostHog

PostHog's official hosted MCP server: analytics, SQL, feature flags, experiments and error tracking from your AI agent.

Does: 5 things
Install: 4 steps
Works with: 5 hosts

Skill Proprietary (LICENSE.txt in skill folder

pptx

by Anthropic

Create, read, edit .pptx/.potx decks: templates, layouts, speaker notes, comments, split and combine.

Does: 3 things
Install: 4 steps
Works with: Claude Code

Plugin Apache-2.0

pr-review-toolkit

by Anthropic

Six review agents: comments, tests, error handling, type design, code quality, simplification.

Does: 4 things
Install: 4 steps
Works with: Claude Code

Plugin Apache-2.0

Project Artifact

by Anthropic

Builds and publishes a living tabbed status page for a multi-workstream project, refreshed to the same URL.

Does: 5 things
Install: 5 steps
Works with: Claude Code

Plugin Apache-2.0

Pyright LSP

by Anthropic

Python (Pyright) language server for Claude Code: code intelligence and diagnostics for .py files.

Does: 3 things
Install: 5 steps
Works with: Claude Code

Plugin Apache-2.0

ralph-loop

by Anthropic

Self-referential loops via a Stop hook: same prompt repeated until a completion promise.

Does: 4 things
Install: 4 steps
Works with: Claude Code

Plugin Apache-2.0

Receipts

by Anthropic

Generates a local Claude Code impact report from your own session transcripts: what shipped, by project.

Does: 5 things
Install: 4 steps
Works with: Claude Code

MCP server MIT

Redis MCP Server

by Redis

Official Redis MCP server: lets AI agents read, write and search Redis data (strings, hashes, streams, JSON, vectors).

Does: 6 things
Install: 4 steps
Works with: Any MCP client

Plugin Apache-2.0

Ruby LSP

by Anthropic

Ruby language server for Claude Code: code intelligence and diagnostics for .rb files.

Does: 3 things
Install: 4 steps
Works with: Claude Code

Plugin Apache-2.0

rust-analyzer LSP

by Anthropic

Rust language server for Claude Code: code intelligence and diagnostics for .rs files.

Does: 3 things
Install: 5 steps
Works with: Claude Code

Plugin Apache-2.0

security-guidance

by Anthropic

Security review for Claude-written code: pattern warnings, LLM diff review on Stop, agentic commit review.

Does: 4 things
Install: 4 steps
Works with: Claude Code

MCP server

Sentry MCP Server

by Sentry

Sentry's MCP service for coding agents: inspect errors, issues, traces and performance from Cursor, Claude Code and others.

Does: 5 things
Install: 4 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.