Repetition is the best candidate: reports, data hand-offs, reminders, first drafts. An agent with functions plus an automation can run that work on its own.
Watch the first week
Do not ship a flow on day one. Review outputs, tighten the prompt, and keep a human on sensitive steps: sending mail, creating an event, or touching a CRM.
Once the pattern is stable, the automation fires on a schedule, an event, or a manual run.