Demo (Everything) MCP server

The MCP server is a comprehensive testing tool designed to showcase Model Context Protocol (MCP) capabilities. It implements various features including prompts, tools, resources, and sampling to help developers test and validate their MCP clients.

Installation Options

Using NPM

Install the package globally:

npm install -g @modelcontextprotocol/server-everything@latest

Running as Docker Container

You can also run the server as a Docker container (see configuration examples below).

Running the Server

Using NPX (Recommended)

Run the default server with stdio transport:

npx @modelcontextprotocol/server-everything

Explicitly specify the transport type:

# For stdio transport
npx @modelcontextprotocol/server-everything stdio

# For streamable HTTP transport
npx @modelcontextprotocol/server-everything streamableHttp

Configuration

With Claude Desktop

Add the following to your claude_desktop_config.json:

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

With VS Code

For manual installation, add this configuration to your VS Code User Settings (JSON):

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

Alternatively, you can add it to .vscode/mcp.json in your workspace (without the mcp key).

Server Features

Available Tools

The server provides the following tools:

1. echo: Returns the input message

   • Input: message (string)

2. add: Adds two numbers

   • Inputs: a and b (numbers)

3. longRunningOperation: Demonstrates progress notifications

   • Inputs: duration (seconds, default: 10), steps (default: 5)

4. sampleLLM: Demonstrates LLM sampling

   • Inputs: prompt (string), maxTokens (number, default: 100)

5. getTinyImage: Returns a test image

   • No inputs required

6. printEnv: Displays environment variables

   • No inputs required

7. annotatedMessage: Shows content annotations

   • Inputs: messageType (error/success/debug), includeImage (boolean)

8. getResourceReference: Returns resource references

   • Input: resourceId (number, 1-100)

9. startElicitation: Initiates interactive input

   • Inputs: color (string), number (1-100), pets (enum)

Available Prompts

1. simple_prompt: Basic prompt without arguments

2. complex_prompt: Advanced prompt with arguments

   • Required: temperature (number)
   • Optional: style (string)

3. resource_prompt: Embeds resource references

   • Required: resourceId (number, 1-100)

Resource System

The server provides 100 test resources:

• Even-numbered resources: Plaintext format
• Odd-numbered resources: Binary blob format

Resources support pagination, subscriptions, templates, and auto-updates.

Using the Server

After installation and configuration, you can interact with the server through compatible MCP clients. The server will respond to tool calls, prompts, and resource requests according to the MCP protocol specifications.

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "everything" '{"command":"npx","args":["-y","@modelcontextprotocol/server-everything"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

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

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

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

3. Restart Claude Desktop for the changes to take effect