Everything MCP Server

Components

Tools

1. echo

   • Simple tool to echo back input messages
   • Input:

     • message

       (string): Message to echo back
   • Returns: Text content with echoed message

2. add

   • Adds two numbers together
   • Inputs:

     • a

       (number): First number

     • b

       (number): Second number
   • Returns: Text result of the addition

3. longRunningOperation

   • Demonstrates progress notifications for long operations
   • Inputs:

     • duration

       (number, default: 10): Duration in seconds

     • steps

       (number, default: 5): Number of progress steps
   • Returns: Completion message with duration and steps
   • Sends progress notifications during execution

4. sampleLLM

   • Demonstrates LLM sampling capability using MCP sampling feature
   • Inputs:

     • prompt

       (string): The prompt to send to the LLM

     • maxTokens

       (number, default: 100): Maximum tokens to generate
   • Returns: Generated LLM response

5. getTinyImage

   • Returns a small test image
   • No inputs required
   • Returns: Base64 encoded PNG image data

6. printEnv

   • Prints all environment variables
   • Useful for debugging MCP server configuration
   • No inputs required
   • Returns: JSON string of all environment variables

7. annotatedMessage

   • Demonstrates how annotations can be used to provide metadata about content
   • Inputs:

     • messageType

       (enum: "error" | "success" | "debug"): Type of message to demonstrate different annotation patterns

     • includeImage

       (boolean, default: false): Whether to include an example image
   • Returns: Content with varying annotations:
     • Error messages: High priority (1.0), visible to both user and assistant
     • Success messages: Medium priority (0.7), user-focused
     • Debug messages: Low priority (0.3), assistant-focused
     • Optional image: Medium priority (0.5), user-focused
   • Example annotations:

     {
       "priority": 1.0,
       "audience": ["user", "assistant"]
     }
     

8. getResourceReference

   • Returns a resource reference that can be used by MCP clients
   • Inputs:

     • resourceId

       (number, 1-100): ID of the resource to reference
   • Returns: A resource reference with:
     • Text introduction
     • Embedded resource with

       type: "resource"

     • Text instruction for using the resource URI

Resources

• Even numbered resources:
  • Plaintext format
  • URI pattern:

    test://static/resource/{even_number}

  • Content: Simple text description
• Odd numbered resources:
  • Binary blob format
  • URI pattern:

    test://static/resource/{odd_number}

  • Content: Base64 encoded binary data

• Supports pagination (10 items per page)
• Allows subscribing to resource updates
• Demonstrates resource templates
• Auto-updates subscribed resources every 5 seconds

Prompts

1. simple_prompt

   • Basic prompt without arguments
   • Returns: Single message exchange

2. complex_prompt

   • Advanced prompt demonstrating argument handling
   • Required arguments:

     • temperature

       (number): Temperature setting
   • Optional arguments:

     • style

       (string): Output style preference
   • Returns: Multi-turn conversation with images

3. resource_prompt

   • Demonstrates embedding resource references in prompts
   • Required arguments:

     • resourceId

       (number): ID of the resource to embed (1-100)
   • Returns: Multi-turn conversation with an embedded resource reference
   • Shows how to include resources directly in prompt messages

Logging

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

Usage with Claude Desktop

claude_desktop_config.json

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