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MCP Client Example

This example demonstrates how to use the Model Context Protocol (MCP) client to interact with an MCP server. The example includes both a client and a server implementation, showcasing various MCP features like tools and prompts.

Features Demonstrated

  • Client initialization and connection to server
  • Listing available tools
  • Calling different tools:
    • Hello tool: Basic greeting functionality
    • Calculate tool: Simple arithmetic operations
    • Time tool: Current time formatting
  • Listing available prompts
  • Using prompts:
    • Uppercase prompt: Converts text to uppercase
    • Reverse prompt: Reverses input text

Running the Example

  1. Make sure you're in the examples/client directory:

    cd examples/client

  2. Run the example:

    go run main.go

The program will:

  1. Start a local MCP server (implemented in server/main.go)
  2. Create an MCP client and connect to the server
  3. Demonstrate various interactions with the server

Expected Output

You should see output similar to this:

Available Tools:
Tool: hello. Description: A simple greeting tool
Tool: calculate. Description: A basic calculator
Tool: time. Description: Returns formatted current time

Calling hello tool:
Hello response: Hello, World!

Calling calculate tool:
Calculate response: Result of 10 + 5 = 15

Calling time tool:
Time response: [current time in format: 2006-01-02 15:04:05]

Available Prompts:
Prompt: uppercase. Description: Converts text to uppercase
Prompt: reverse. Description: Reverses the input text

Calling uppercase prompt:
Uppercase response: HELLO, MODEL CONTEXT PROTOCOL!

Calling reverse prompt:
Reverse response: !locotorP txetnoC ledoM ,olleH

Code Structure

  • main.go: Client implementation and example usage
  • server/main.go: Example MCP server implementation with sample tools and prompts

Notes

  • The server is automatically started and stopped by the client program
  • The example uses stdio transport for communication between client and server
  • All tools and prompts are simple examples to demonstrate the protocol functionality