not found: tool not found

[yb19890724]

package main

import (
	"context"
	"fmt"

	"github.com/mark3labs/mcp-go/mcp"
	"github.com/mark3labs/mcp-go/server"
)

func main() {
	// Create a new MCP server
	s := server.NewMCPServer(
		"Demo 🚀",
		"1.0.0",
	)

	// Add tool
	tool := mcp.NewTool("hello_world",
		mcp.WithDescription("Say hello to someone"),
		mcp.WithString("name",
			mcp.Required(),
			mcp.Description("Name of the person to greet"),
		),
	)

	// Add tool handler
	s.AddTool(tool, helloHandler)

	// Start the stdio server
	if err := server.ServeStdio(s); err != nil {
		fmt.Printf("Server error: %v\n", err)
	}

}

func helloHandler(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	name, err := request.RequireString("name")
	if err != nil {
		return mcp.NewToolResultError(err.Error()), nil
	}

	return mcp.NewToolResultText(fmt.Sprintf("Hello, %s!", name)), nil
}

`
go run main.go

{"jsonrpc":"2.0","method":"tools/call","params":{"name":"hello_wolrd"},"id":2}
{"jsonrpc":"2.0","id":2,"error":{"code":-32602,"message":"tool 'hello_wolrd' not found: tool not found"}}
{"jsonrpc":"2.0","method":"hellow_wolrd","params":{"name":"hello_wolrd"},"id":2}
{"jsonrpc":"2.0","id":2,"error":{"code":-32601,"message":"Method hello_wolrd not found"}}
`

how do i test ？