Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It usefully discloses that entities on the old layer are reassigned to the new name, but omits permissions, error conditions, undo behavior, and what happens if the old layer is missing or the new name conflicts.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.