Here is an example code snippet in Go for creating a JWT token:

package main

import (
	"fmt"
	"time"
	"github.com/dgrijalva/jwt-go"
)

func main() {
	// create a new token
	token := jwt.New(jwt.SigningMethodHS256)

	// Set some claims
	claims := token.Claims.(jwt.MapClaims)
	claims["username"] = "agentgpt"
	claims["exp"] = time.Now().Add(time.Hour * 72).Unix()

	// Sign and get the complete encoded token as a string
	tokenString, err := token.SignedString([]byte("secret"))
	if err != nil {
		fmt.Println("Error creating token:", err)
		return
	}
	
	fmt.Println(tokenString)
}
To test this code, you can run it and check if the output is a valid JWT token string.

Note: Make sure to replace "secret" with your own secret key for signing the token.
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