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# Go-MCP
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<a href="README_CN.md">简体中文</a> | <a href="README_TW.md">繁體中文</a> | <a href="README_VI.md">Tiếng Việt</a>
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## 🚀 Overview
Go-MCP is a powerful Go version of the MCP SDK that implements the Model Context Protocol (MCP) to facilitate seamless communication between external systems and AI applications. Based on the strong typing and performance advantages of the Go language, it provides a concise and idiomatic API to facilitate your integration of external systems into AI applications.
### ✨ Key Features
- 🔄 **Complete Protocol Implementation**: Full implementation of the MCP specification, ensuring seamless integration with all compatible services
- 🏗️ **Elegant Architecture Design**: Adopts a clear three-layer architecture, supports bidirectional communication, ensuring code modularity and extensibility
- 🔌 **Seamless Integration with Web Frameworks**: Provides MCP protocol-compliant http.Handler, allowing developers to integrate MCP into their service frameworks
- 🛡️ **Type Safety**: Leverages Go's strong type system for clear, highly maintainable code
- 📦 **Simple Deployment**: Benefits from Go's static compilation, eliminating complex dependency management
- ⚡ **High-Performance Design**: Fully utilizes Go's concurrency capabilities, maintaining excellent performance and low resource overhead across various scenarios
## 🛠️ Installation
```bash
go get github.com/ThinkInAIXYZ/go-mcp
```
Requires Go 1.18 or higher.
## 🎯 Quick Start
### Client Example
```go
package main
import (
"context"
"log"
"github.com/ThinkInAIXYZ/go-mcp/client"
"github.com/ThinkInAIXYZ/go-mcp/transport"
)
func main() {
// Create SSE transport client
transportClient, err := transport.NewSSEClientTransport("http://127.0.0.1:8080/sse")
if err != nil {
log.Fatalf("Failed to create transport client: %v", err)
}
// Initialize MCP client
mcpClient, err := client.NewClient(transportClient)
if err != nil {
log.Fatalf("Failed to create MCP client: %v", err)
}
defer mcpClient.Close()
// Get available tools
tools, err := mcpClient.ListTools(context.Background())
if err != nil {
log.Fatalf("Failed to list tools: %v", err)
}
log.Printf("Available tools: %+v", tools)
}
```
### Server Example
```go
package main
import (
"context"
"fmt"
"log"
"time"
"github.com/ThinkInAIXYZ/go-mcp/protocol"
"github.com/ThinkInAIXYZ/go-mcp/server"
"github.com/ThinkInAIXYZ/go-mcp/transport"
)
type TimeRequest struct {
Timezone string `json:"timezone" description:"timezone" required:"true"` // Use field tag to describe input schema
}
func main() {
// Create SSE transport server
transportServer, err := transport.NewSSEServerTransport("127.0.0.1:8080")
if err != nil {
log.Fatalf("Failed to create transport server: %v", err)
}
// Initialize MCP server
mcpServer, err := server.NewServer(transportServer)
if err != nil {
log.Fatalf("Failed to create MCP server: %v", err)
}
// Optional: Global middleware (variadic - multiple middleware supported)
// mcpServer.Use(
// LoggingMiddleware,
// AuthMiddleware,
// MetricsMiddleware,
// )
// Register time query tool
tool, err := protocol.NewTool("current_time", "Get current time for specified timezone", TimeRequest{})
if err != nil {
log.Fatalf("Failed to create tool: %v", err)
return
}
mcpServer.RegisterTool(tool, handleTimeRequest)
// Start server
if err = mcpServer.Run(); err != nil {
log.Fatalf("Server failed to start: %v", err)
}
}
func handleTimeRequest(ctx context.Context, req *protocol.CallToolRequest) (*protocol.CallToolResult, error) {
var timeReq TimeRequest
if err := protocol.VerifyAndUnmarshal(req.RawArguments, &timeReq); err != nil {
return nil, err
}
loc, err := time.LoadLocation(timeReq.Timezone)
if err != nil {
return nil, fmt.Errorf("invalid timezone: %v", err)
}
return &protocol.CallToolResult{
Content: []protocol.Content{
&protocol.TextContent{
Type: "text",
Text: time.Now().In(loc).String(),
},
},
}, nil
}
```
### Integration With Gin Server
```go
package main
import (
"context"
"log"
"github.com/ThinkInAIXYZ/go-mcp/protocol"
"github.com/ThinkInAIXYZ/go-mcp/server"
"github.com/ThinkInAIXYZ/go-mcp/transport"
"github.com/gin-gonic/gin"
)
func main() {
messageEndpointURL := "/message"
sseTransport, mcpHandler, err := transport.NewSSEServerTransportAndHandler(messageEndpointURL)
if err != nil {
log.Panicf("new sse transport and hander with error: %v", err)
}
// new mcp server
mcpServer, _ := server.NewServer(sseTransport)
// register tool with mcpServer
// mcpServer.RegisterTool(tool, toolHandler)
// start mcp Server
go func() {
mcpServer.Run()
}()
defer mcpServer.Shutdown(context.Background())
r := gin.Default()
r.GET("/sse", func(ctx *gin.Context) {
mcpHandler.HandleSSE().ServeHTTP(ctx.Writer, ctx.Request)
})
r.POST(messageEndpointURL, func(ctx *gin.Context) {
mcpHandler.HandleMessage().ServeHTTP(ctx.Writer, ctx.Request)
})
if err = r.Run(":8080"); err != nil {
return
}
}
```
[Reference：A more complete example](https://github.com/ThinkInAIXYZ/go-mcp/blob/main/examples/http_handler/main.go)
## 🏗️ Architecture Design
Go-MCP adopts an elegant three-layer architecture:
1. **Transport Layer**: Handles underlying communication implementation, supporting multiple transport protocols
2. **Protocol Layer**: Handles MCP protocol encoding/decoding and data structure definitions
3. **User Layer**: Provides friendly client and server APIs
Currently supported transport methods:
- **HTTP SSE/POST**: HTTP-based server push and client requests, suitable for web scenarios
- **Streamable HTTP**: Supports HTTP POST/GET requests with both stateless and stateful modes, where stateful mode utilizes SSE for multi-message streaming to enable server-to-client notifications and requests
- **Stdio**: Standard input/output stream-based, suitable for local inter-process communication
The transport layer uses a unified interface abstraction, making it simple to add new transport methods (like Streamable HTTP, WebSocket, gRPC) without affecting upper-layer code.
## 🤝 Contributing
We welcome all forms of contributions! Please see [CONTRIBUTING.md](CONTRIBUTING.md) for details.
## 📄 License
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
## 📞 Contact Us
- **GitHub Issues**: [Submit an issue](https://github.com/ThinkInAIXYZ/go-mcp/issues)
- **Discord**: Click [here](https://discord.gg/4CSU8HYt) to join our user group
- **WeChat Group**:
## ✨ Contributors
Thanks to all developers who have contributed to this project!
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