Ticket is not included but the stop is included, so it’s up to you to decide if you visit it or not. The guide will take you to the fort and will explain you about it, also probability will tell you that is not worth to pay to go inside if you are goin to visit Agra Fort. So the last decision is yours.
Yes, but tickets are not included. If you are going to Agra I recommend you to visit Agra Fort and don’t spend your time visiting Red Fort. It’s just my opinion, different it is, if you don’t have the chance to visit Agra Fort.