Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and readOnlyHint=false, so the tool's mutating nature is known. The description adds useful context ('previously stored memory', 'clear sensitive data') but does not disclose additional behavioral details such as irreversibility, permissions, or error behavior beyond what annotations imply.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.