Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. It communicates that results are ranked, that filtering is optional, and that pagination is supported, all of which are useful. It does not mention response format, default behavior, or whether results are read-only, though 'retrieve' and 'browse' strongly imply a read operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.