Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, so the destructive nature is known. The description adds the nuance that deletion is irreversible ('Not recoverable'), which is context beyond the boolean hint. However, it does not disclose other behavioral aspects such as error handling, permissions, or side effects. With annotations covering the safety profile, the description adds some value but not much more.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.