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package main
import (
"context"
"fmt"
"log"
"time"
"github.com/cloudwego/eino/components/tool"
"github.com/cloudwego/eino/compose"
"github.com/cloudwego/eino/flow/agent/react"
"github.com/cloudwego/eino/schema"
"github.com/mark3labs/mcp-go/client"
"github.com/mark3labs/mcp-go/mcp"
"github.com/mark3labs/mcp-go/server"
"github.com/cloudwego/eino-ext/components/model/ollama"
mcpp "github.com/cloudwego/eino-ext/components/tool/mcp"
)
func main() {
startMCPServer()
time.Sleep(1 * time.Second)
ctx := context.Background()
mcpTools := getMCPTool(ctx)
chatModel, err := ollama.NewChatModel(ctx, &ollama.ChatModelConfig{
BaseURL: "http://localhost:11434",
Model: "qwen2.5:7b",
})
if err != nil {
log.Printf("NewChatModel failed, err=%v", err)
return
}
agent, err := react.NewAgent(ctx, &react.AgentConfig{
Model: chatModel,
ToolsConfig: compose.ToolsNodeConfig{Tools: mcpTools},
})
fmt.Println(err)
rsp, err := agent.Generate(ctx, []*schema.Message{
{
Role: schema.User,
Content: "我今天买了一斤苹果和一斤梨，苹果是5块一斤，梨是3块一斤，我一共花了多少钱？",
},
})
fmt.Println(rsp, err)
}
func getMCPTool(ctx context.Context) []tool.BaseTool {
cli, err := client.NewSSEMCPClient("http://localhost:12345/sse")
if err != nil {
log.Fatal(err)
}
err = cli.Start(ctx)
if err != nil {
log.Fatal(err)
}
initRequest := mcp.InitializeRequest{}
initRequest.Params.ProtocolVersion = mcp.LATEST_PROTOCOL_VERSION
initRequest.Params.ClientInfo = mcp.Implementation{
Name: "example-client",
Version: "1.0.0",
}
_, err = cli.Initialize(ctx, initRequest)
if err != nil {
log.Fatal(err)
}
tools, err := mcpp.GetTools(ctx, &mcpp.Config{Cli: cli})
if err != nil {
log.Fatal(err)
}
return tools
}
func startMCPServer() {
svr := server.NewMCPServer("demo", mcp.LATEST_PROTOCOL_VERSION)
svr.AddTool(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"),
),
), func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
fmt.Println("Received request:", request)
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 mcp.NewToolResultText("Cannot divide by zero"), nil
}
result = x / y
}
log.Printf("Calculated result: %.2f", result)
return mcp.NewToolResultText(fmt.Sprintf("%.2f", result)), nil
})
go func() {
defer func() {
e := recover()
if e != nil {
fmt.Println(e)
}
}()
err := server.NewSSEServer(svr, server.WithBaseURL("http://localhost:12345")).Start("localhost:12345")
if err != nil {
log.Fatal(err)
}
}()
}
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