Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the bar is lower. The description adds minor context ('previously stored', 'clear sensitive data') but doesn't disclose additional behavioral details like irreversibility or error handling. It is consistent 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.