Tell the cut what to change, the way you'd tell an editor. Mechanical changes happen instantly and are free; creative work is a re-cut and shows its price first.
A conversation per project that talks and acts. Ask for several things in one message: “remove the last shot, drop shot 3 and trim the end of shot 5”.
Each message shows its price; applying a mechanical change is free.
“cut the first three seconds”, “remove clip 4”, “move clip 5 to the front” happen on the spot, with no re-cut.
“make the opening punchier” is creative work: Endroll tells you the price, then builds the next version.
Any change the assistant makes undoes like your own.