Machines should generally take work that is repeatable, bounded, inspectable, and recoverable. People should retain goals, value judgments, sensitive relationships, material commitments, policy changes, and decisions whose consequences require accountable acceptance. Between those poles sits a broad preparation zone where machines can assemble evidence, identify options, surface conflicts, and recommend a path without deciding it.
This answer is a starting presumption, not a universal rule. A low-cost action can still affect privacy or fairness. A highly repetitive process can still contain rare cases with serious consequences. An experienced employee may recognize context that no formal rule captures. The organization must examine the actual work, affected people, data, failure modes, and authority instead of applying a slogan to a department.
Terminology matters because it shapes what a team believes has been delegated. Calling a system an assistant suggests that a person directs each use, while calling the same path autonomous may imply standing permission. Neither label proves the actual boundary. Teams should inspect credentials, triggers, approvals, tool permissions, stop behavior, and accountable ownership. The operational facts should control the classification, and those facts should be understandable to the people whose work or data is affected.