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Everything (Reference)

Name: Everything (Reference)
Author: Anthropic

Official MCP reference server that exercises all protocol capabilities: resources, prompts, tools, and sampling. Useful for testing MCP client implementations.

referencetestingmcp

Install

npx @modelcontextprotocol/server-everything

claude_desktop_config.json

{
  "mcpServers": {
    "everything": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-everything"
      ]
    }
  }
}

Add this to your Claude Desktop config file. Find it at ~/Library/Application Support/Claude/claude_desktop_config.json on macOS.

What this does

Everything (Reference) exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.