go get -u github.com/puttsk/go-mcp

// main.go
import (
  "context"
  "fmt"
  "log"
  "net/http"

  "github.com/aws/aws-lambda-go/events"
  "github.com/aws/aws-lambda-go/lambda"
  "github.com/puttsk/go-mcp"
  "github.com/puttsk/go-mcp/session/memory"
  "github.com/puttsk/go-mcp/transport/awslambda"
)

var server *mcp.McpServer

func handler(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {

  // Processing request from AWS Lambda
  resp, err := server.ProcessRequest(ctx, request)
  if err != nil {
    return events.APIGatewayProxyResponse{
      Body:       "Error processing request",
      Headers:    headers,
      StatusCode: http.StatusInternalServerError,
    }, nil
  }

  if response, ok := resp.(events.APIGatewayProxyResponse); ok {
    return response, nil
  } else {
    return events.APIGatewayProxyResponse{
      Body:       "Invalid response type",
      Headers:    headers,
      StatusCode: http.StatusInternalServerError,
    }, nil
  }
}

func init() {
  // Initialize the MCP server with in-memory session manager and AWS Lambda transport handler
  server, _ = mcp.NewMcpServer("mcptest", "1.0.0", mcp.McpProtocol2025_30_26)
  server.LogLevel = mcp.LogLevelDebug
  server.TransportHandler = &awslambda.TransportHandler{} // Setup transport handler
  server.SessionManager = memory.NewSessionManager() // Setup in-memory session manager

  // Register tool "add" with the server
  server.RegisterTool("add", 
    func(a, b int) int { return a + b },
    mcp.McpToolParameter{Name: "a", Description: "First number"},
    mcp.McpToolParameter{Name: "b", Description: "Second number"},
  )
  server.SetToolDescription("add", "Tool for adding two integers")
}

func main() {
  lambda.Start(handler)
}