Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It discloses that results are 'active' heuristics and emphasizes low token output, which is useful. But it does not state permissions, pagination behavior, whether results are cached, or any other operational constraints.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.