Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate destructiveHint=true and readOnlyHint=false. The description reinforces this by stating 'Delete' and adds behavioral context by explaining when deletion is appropriate (stale context, end of task, clearing sensitive data). There is no contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.