Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full behavioral burden. 'No identifiers are retained' adds one useful privacy trait, but it does not disclose whether the operation is read-only, what inputs are actually used, what side effects occur, or what the classification output looks like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.