Do you have to pay a commission if your agent sell your home to another agent they both want a commission?

The total commission amount should be in the listing agreement. If your listing agent has agreed to sell your home for 6% and another agent decides to buy it, your listing agent is responsible for paying that agent's commission out of the 6% commission you have agreed to pay them for procuring a buyer. They are not allowed to unilaterally demand a separate commission for the other agent. If they try to force you to pay extra commission above the original amount you agreed to pay you should contact that agent's broker in charge. If you do not get satisfaction from the broker in charge then contact your state's real estate Commission and complain long and loudly.