Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of explaining behavior. It discloses the important scoping rule (only documents owned by or shared with the authenticated user are returned) and the search action itself, but does not mention whether results are paginated, sorted, or limited, nor does it explicitly confirm read-only behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.