Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate destructiveHint=true, readOnlyHint=false, and idempotentHint=true. The description adds the notion of 'previously stored' implying the key must exist, but does not clarify behavior for non-existent keys or confirm idempotency. It provides modest additional context about clearing sensitive data.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.