Demo (Everything) MCP server

This MCP server implements all features of the Model Context Protocol, serving as a test environment for MCP client developers. It demonstrates prompts, tools, resources, sampling, and other capabilities to help with client development and testing.

Installation

To use the Everything MCP Server, you need to install it via npm:

npm install -g @modelcontextprotocol/server-everything

Alternatively, you can run it directly without installation using npx:

npx -y @modelcontextprotocol/server-everything

Integration with Claude Desktop

Add the server to your Claude Desktop configuration by editing the claude_desktop_config.json file:

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

Available Features

Tools

The server provides several tools to test MCP client functionality:

Echo Tool

Returns the input message back to the client.

• Input: message (string)
• Usage example:

{
  "message": "Hello MCP World!"
}

Add Tool

Performs addition of two numbers.

• Inputs:
  • a (number)
  • b (number)
• Usage example:

{
  "a": 5,
  "b": 10
}

Long Running Operation

Demonstrates progress notifications for operations that take time.

• Inputs:
  • duration (number, default: 10) - seconds to run
  • steps (number, default: 5) - progress notification steps
• Usage example:

{
  "duration": 20,
  "steps": 10
}

Sample LLM

Tests LLM sampling capabilities of the MCP protocol.

• Inputs:
  • prompt (string) - text prompt for the LLM
  • maxTokens (number, default: 100) - token generation limit
• Usage example:

{
  "prompt": "Write a short poem about technology",
  "maxTokens": 200
}

Get Tiny Image

Returns a test image in base64 format.

• No inputs required

Print Environment

Displays all environment variables for debugging.

• No inputs required

Annotated Message

Demonstrates content annotations with metadata.

• Inputs:
  • messageType (enum: "error" | "success" | "debug")
  • includeImage (boolean, default: false)
• Usage example:

{
  "messageType": "success",
  "includeImage": true
}

Resources

The server provides 100 test resources that can be accessed with these URIs:

• Even-numbered resources (plaintext):

  test://static/resource/2
  test://static/resource/4
  ...
  

• Odd-numbered resources (binary):

  test://static/resource/1
  test://static/resource/3
  ...
  

Resource features include:

• Pagination (10 items per page)
• Resource update subscriptions
• Template support
• Automatic updates every 5 seconds for subscribed resources

Prompts

Simple Prompt

Basic prompt without arguments:

simple_prompt

Complex Prompt

Advanced prompt with arguments:

complex_prompt temperature=0.7 style="creative"

Required arguments:

• temperature (number)

Optional arguments:

• style (string)

Monitoring

The server generates random-level log messages every 15 seconds for testing notification handling. These appear in the following format:

{
  "method": "notifications/message",
  "params": {
    "level": "info",
    "data": "Info-level message"
  }
}

You can use these notifications to test your client's ability to handle server events.

How to add this MCP server to 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 > MCP and click "Add new global MCP server".

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

{
    "mcpServers": {
        "cursor-rules-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "cursor-rules-mcp"
            ]
        }
    }
}

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 explictly ask the agent to use the tool by mentioning the tool name and describing what the function does.