Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and idempotentHint=true, and the description adds context about what gets destroyed (a previously stored memory) and specific use cases for deletion (stale context, completed task, sensitive data). This goes beyond the annotations by explaining the rationale for deletion.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.