Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate destructiveHint=true and readOnlyHint=false, so the description's mention of deletion is consistent. The description adds context about clearing sensitive data but does not elaborate on idempotency (idempotentHint=true) or behavior for missing keys. Moderate added value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.