Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description does real work: it discloses the default filter (open only), the sort order (newest first), and an authorization requirement (owner or office only). It does not state that the operation is read-only, nor how results are paged despite a limit parameter.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.