The agent told him: you already finished this ahead of schedule
He sent a screenshot to his Muse agent "Anuki" to set a reminder, then finished the task himself before the reminder was due — and the agent proactively let him know he was already ahead of schedule.
Try it yourself
Copy this to Muse and replace the [brackets] with your own details:
I'm sending you a screenshot — set a reminder for me, and if I finish the task before the reminder is due, be sure to let me know proactively.