Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and readOnlyHint=false, so the agent knows this is a destructive mutation. The description adds use-case context and confirms the key refers to a previously stored memory, but it does not add details about irreversible deletion or behavior on non-existent keys, which the idempotentHint annotation vaguely covers.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.