Agent Causation is when something causes something else to happen. It's kind of like pushing one domino that knocks down lots of other dominoes. In the same way, when an agent (like a person, animal, or force) causes something to happen, this is agent causation. So when your mom says, "Clean your room!" and you actually do it, that's an example of agent causation. Your mom is the one causing the room to be clean by telling you to do it.