frontend-design
by Anthropic
Guidance for distinctive, non-templated UI design: aesthetic direction, typography and layout choices.
- Does
- 4 things
- Install
- 4 steps
- Works with
- Claude Code
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
Gemini CLI Extensions
by Google
Gemini CLI extensions package prompts, MCP servers, commands, themes, hooks, sub-agents and skills; installed from GitHub.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Gemini CLI
Rules & instructions Apache-2.0
GEMINI.md
by Google
Context files named GEMINI.md that give Gemini CLI project instructions, personas and style guides on every prompt.
- Does
- 6 things
- Install
- 5 steps
- Works with
- Gemini CLI
MCP server MIT
Git MCP Server
by Model Context Protocol
Reference MCP server with tools to read, search and change Git repositories: status, diff, log, commit, branch.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Any MCP client
GitHub Copilot custom instructions
by GitHub
Repository custom instructions for GitHub Copilot: .github/copilot-instructions.md, path-specific files and AGENTS.md.
- Does
- 5 things
- Install
- 5 steps
- Works with
- GitHub Copilot
MCP server MIT
GitHub MCP Server
by GitHub
GitHub's official MCP server for reading repos, managing issues and PRs, and monitoring Actions from AI tools.
- Does
- 6 things
- Install
- 4 steps
- Works with
- 5 hosts
MCP server Apache-2.0
Grafana MCP Server
by Grafana Labs
Official Grafana MCP server: dashboards, datasources, Prometheus, Loki, alerting, incidents and more for AI agents.
- Does
- 5 things
- Install
- 5 steps
- Works with
- Any MCP client, Cursor
MCP server MIT
Hugging Face MCP Server
by Hugging Face
Official Hugging Face MCP server: connect an LLM to the Hub and Gradio Spaces, hosted at huggingface.co/mcp or run locally.
- Does
- 5 things
- Install
- 5 steps
- Works with
- 4 hosts
Skill Apache-2.0
Internal Comms
by Anthropic
Helps write internal communications such as 3P updates, newsletters, FAQs, status reports and incident reports.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Claude Code
Plugin Apache-2.0
Kotlin LSP
by Anthropic
Kotlin language server for Claude Code: code intelligence and diagnostics for .kt files.
- Does
- 3 things
- Install
- 3 steps
- Works with
- Claude Code
Plugin Apache-2.0
Learning Output Style
by Anthropic
SessionStart hook that makes Claude ask you to write 5-10 lines at decision points and share educational insights.
- Does
- 5 things
- Install
- 3 steps
- Works with
- Claude Code
Linear MCP Server
by Linear
Linear's hosted MCP server for finding, creating and updating issues, projects and comments.
- Does
- 5 things
- Install
- 4 steps
- Works with
- 5 hosts
Make MCP Server
by Make
Make-hosted MCP server that lets AI clients run Make scenarios and manage your Make account.
- Does
- 4 things
- Install
- 4 steps
- Works with
- Any MCP client, Claude Code
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
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 MIT
Memory MCP Server
by Model Context Protocol
Reference MCP server giving agents persistent memory as a local knowledge graph of entities, relations and observations.
- Does
- 5 things
- Install
- 4 steps
- Works with
- Any MCP client
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
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.