Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses only one behavioral trait — the implicit 'ativos' filter — and says nothing about pagination, result size, ordering, or required permissions for a list endpoint that could return a large collection.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.