Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does very little: it implies a read-only listing but says nothing about permissions, result volume, pagination, or what 'dossier' scoping does. Only the fact that search is optional and textual is disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.