6.如何用go语言搭MCP

mkdir mcp-server
cd mcp-server
vim main.go
#在main.go中添加如下内容

package main

import (
    "context"
    "errors"
    "fmt"

    "github.com/mark3labs/mcp-go/mcp"
    "github.com/mark3labs/mcp-go/server"
)

func main() {
    // Create a new MCP server
    s := server.NewMCPServer(
        "Calculator Demo",
        "1.0.0",
        server.WithResourceCapabilities(true, true),
        server.WithLogging(),
        server.WithRecovery(),
    )

    // Add a calculator tool
    calculatorTool := mcp.NewTool("calculate",
        mcp.WithDescription("Perform basic arithmetic operations"),
        mcp.WithString("operation",
            mcp.Required(),
            mcp.Description("The operation to perform (add, subtract, multiply, divide)"),
            mcp.Enum("add", "subtract", "multiply", "divide"),
        ),
        mcp.WithNumber("x",
            mcp.Required(),
            mcp.Description("First number"),
        ),
        mcp.WithNumber("y",
            mcp.Required(),
            mcp.Description("Second number"),
        ),
    )

    // Add the calculator handler
    s.AddTool(calculatorTool, func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
        op := request.Params.Arguments["operation"].(string)
        x := request.Params.Arguments["x"].(float64)
        y := request.Params.Arguments["y"].(float64)

        var result float64
        switch op {
        case "add":
            result = x + y
        case "subtract":
            result = x - y
        case "multiply":
            result = x * y
        case "divide":
            if y == 0 {
                return nil, errors.New("Cannot divide by zero")
            }
            result = x / y
        }

        return mcp.NewToolResultText(fmt.Sprintf("%.2f", result)), nil
    })

    // Start the server
    if err := server.ServeStdio(s); err != nil {
        fmt.Printf("Server error: %v\n", err)
    }
}

#初始化依赖包
go mod init
#加载依赖包
go mod tidy
#编译
go build -o mcpServer main.go
#查看目录文件
ls -l
#查看文件路径path
pwd
#如下：

{
  "mcpServers": {
    "calculate": {
      "command": "/Users/xxx（你的项目路径）/src/mcp-service/mcpServer"
    }
  }
}