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 the nature of the data (sensitive) and the lifecycle of memories. While it doesn't elaborate on idempotency or missing keys, it complements the annotations well without contradicting them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.