116 documented

Skills · plugins · MCP · rules114 official

Which agent do you use?

Pick your host to see what plugs into it. Every entry is documented from its official repository or docs, with install steps, permissions and limits.

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

87 extensions · Clear filters

Plugin Apache-2.0

Math Olympiad

by Anthropic

Solves competition math (IMO, Putnam, USAMO) with context-isolated adversarial proof verification.

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

Plugin Apache-2.0

Math Proof

by Anthropic

Two skills for research-level math: solo (single session) and siege (hours of judge and worker sub-agents), ending in proof.md.

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

Plugin Apache-2.0

MCP Server Dev

by Anthropic

Three skills for designing and building MCP servers: remote HTTP, MCP apps with UI widgets, and MCPB packaging.

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

Plugin Apache-2.0

MCP Tunnels

by Anthropic

Walks you through connecting Claude to a private MCP server via an Anthropic MCP tunnel using Docker Compose.

Does: 6 things
Install: 5 steps
Works with: Claude Code

Skill

mcp-builder

by Anthropic

Guide for building high-quality MCP servers in Python (FastMCP) or Node/TypeScript so LLMs can use external APIs.

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

MCP server CC-BY-4.0

Microsoft Learn MCP Server

by Microsoft

Free remote MCP server giving AI assistants search and fetch access to official Microsoft Learn docs and code samples.

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

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 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

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 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

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