mcp-golang — Claude MCP 必备工具中文教程

Example Usage

Install with go get github.com/metoro-io/mcp-golang

Server Example

package main

import (
	"fmt"
	"github.com/metoro-io/mcp-golang"
	"github.com/metoro-io/mcp-golang/transport/stdio"
)

// Tool arguments are just structs, annotated with jsonschema tags
// More at https://mcpgolang.com/tools#schema-generation
type Content struct {
	Title       string  `json:"title" jsonschema:"required,description=The title to submit"`
	Description *string `json:"description" jsonschema:"description=The description to submit"`
}
type MyFunctionsArguments struct {
	Submitter string  `json:"submitter" jsonschema:"required,description=The name of the thing calling this tool (openai, google, claude, etc)"`
	Content   Content `json:"content" jsonschema:"required,description=The content of the message"`
}

func main() {
	done := make(chan struct{})

	server := mcp_golang.NewServer(stdio.NewStdioServerTransport())
	err := server.RegisterTool("hello", "Say hello to a person", func(arguments MyFunctionsArguments) (*mcp_golang.ToolResponse, error) {
		return mcp_golang.NewToolResponse(mcp_golang.NewTextContent(fmt.Sprintf("Hello, %server!", arguments.Submitter))), nil
	})
	if err != nil {
		panic(err)
	}

	err = server.RegisterPrompt("promt_test", "This is a test prompt", func(arguments Content) (*mcp_golang.PromptResponse, error) {
		return mcp_golang.NewPromptResponse("description", mcp_golang.NewPromptMessage(mcp_golang.NewTextContent(fmt.Sprintf("Hello, %server!", arguments.Title)), mcp_golang.RoleUser)), nil
	})
	if err != nil {
		panic(err)
	}

	err = server.RegisterResource("test://resource", "resource_test", "This is a test resource", "application/json", func() (*mcp_golang.ResourceResponse, error) {
		return mcp_golang.NewResourceResponse(mcp_golang.NewTextEmbeddedResource("test://resource", "This is a test resource", "application/json")), nil
	})

	err = server.Serve()
	if err != nil {
		panic(err)
	}

	<-done
}

HTTP Server Example

You can also create an HTTP-based server using either the standard HTTP transport or Gin framework:

// Standard HTTP
transport := http.NewHTTPTransport("/mcp")
transport.WithAddr(":8080")
server := mcp_golang.NewServer(transport)

// Or with Gin framework
transport := http.NewGinTransport()
router := gin.Default()
router.POST("/mcp", transport.Handler())
server := mcp_golang.NewServer(transport)

Note: HTTP transports are stateless and don't support bidirectional features like notifications. Use stdio transport if you need those features.

Client Example

Checkout the examples/client directory for a more complete example.

package main

import (
    "context"
    "log"
    mcp "github.com/metoro-io/mcp-golang"
    "github.com/metoro-io/mcp-golang/transport/stdio"
)

// Define type-safe arguments
type CalculateArgs struct {
    Operation string `json:"operation"`
    A         int    `json:"a"`
    B         int    `json:"b"`
}

func main() {
   cmd := exec.Command("go", "run", "./server/main.go")
   stdin, err := cmd.StdinPipe()
   if err != nil {
    log.Fatalf("Failed to get stdin pipe: %v", err)
   }
   stdout, err := cmd.StdoutPipe()
   if err != nil {
    log.Fatalf("Failed to get stdout pipe: %v", err)
   }

   if err := cmd.Start(); err != nil {
    log.Fatalf("Failed to start server: %v", err)
   }
   defer cmd.Process.Kill()
    // Create and initialize client
    transport := stdio.NewStdioServerTransportWithIO(stdout, stdin)
    client := mcp.NewClient(transport)
    
    if _, err := client.Initialize(context.Background()); err != nil {
        log.Fatalf("Failed to initialize: %v", err)
    }

    // Call a tool with typed arguments
    args := CalculateArgs{
        Operation: "add",
        A:         10,
        B:         5,
    }
    
    response, err := client.CallTool(context.Background(), "calculate", args)
    if err != nil {
        log.Fatalf("Failed to call tool: %v", err)
    }
    
    if response != nil && len(response.Content) > 0 {
        log.Printf("Result: %s", response.Content[0].TextContent.Text)
    }
}

Examples

Some more extensive examples using the library found here:

• <img height="12" width="12" src="https://metoro.io/static/images/logos/Metoro.svg" /> Metoro - Query and interact with kubernetes environments monitored by Metoro

Open a PR to add your own projects!