Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, readOnlyHint=false, and idempotentHint=true, covering the mutation and idempotency aspects. The description adds context about clearing sensitive data and stale context, but does not disclose additional behavioral traits such as error handling on non-existent keys. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.