MCP服务器 (Go)
Model Context Protocol 的 Go 实现

描述

一个用于服务器和客户端的 Model Context Protocol (MCP) 的 Go 实现。

详情

类型

AI Integration
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mcp-golang

mcp-golang is an unofficial implementation of the Model Context Protocol in Go.

Write MCP servers and clients in golang with a few lines of code.

Docs at https://mcpgolang.com

Highlights

  • 🛡️Type safety - Define your tool arguments as native go structs, have mcp-golang handle the rest. Automatic schema generation, deserialization, error handling etc.
  • 🚛 Custom transports - Use the built-in transports (stdio for full feature support, HTTP for stateless communication) or write your own.
  • Low boilerplate - mcp-golang generates all the MCP endpoints for you apart from your tools, prompts and resources.
  • 🧩 Modular - The library is split into three components: transport, protocol and server/client. Use them all or take what you need.
  • 🔄 Bi-directional - Full support for both server and client implementations through stdio transport.

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) } }

Using with Claude Desktop

Create a file in ~/Library/Application Support/Claude/claude_desktop_config.json with the following contents:

{ "mcpServers": { "golang-mcp-server": { "command": "<your path to golang MCP server go executable>", "args": [], "env": {} } } }

Contributions

Contributions are more than welcome! Please check out our contribution guidelines.

Discord

Got any suggestions, have a question on the api or usage? Ask on the discord server. A maintainer will be happy to help you out.

Examples

Some more extensive examples using the library found here:

  • Metoro - Query and interact with kubernetes environments monitored by Metoro

Open a PR to add your own projects!

Server Feature Implementation

Tools

  • [x] Tool Calls
  • [x] Native go structs as arguments
  • [x] Programatically generated tool list endpoint
  • [x] Change notifications
  • [x] Pagination

Prompts

  • [x] Prompt Calls
  • [x] Programatically generated prompt list endpoint
  • [x] Change notifications
  • [x] Pagination

Resources

  • [x] Resource Calls
  • [x] Programatically generated resource list endpoint
  • [x] Change notifications
  • [x] Pagination

Transports

  • [x] Stdio - Full support for all features including bidirectional communication
  • [x] HTTP - Stateless transport for simple request-response scenarios (no notifications support)
  • [x] Gin - HTTP transport with Gin framework integration (stateless, no notifications support)
  • [x] SSE
  • [x] Custom transport support
  • [ ] HTTPS with custom auth support - in progress. Not currently part of the spec but we'll be adding experimental support for it.

Client

  • [x] Call tools
  • [x] Call prompts
  • [x] Call resources
  • [x] List tools
  • [x] List prompts
  • [x] List resources