Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It implies a read operation via 'Get' and suggests a summarized result via 'aggregate', but it does not explain pagination, time windows, filtering, account scope semantics, or what the returned aggregate actually represents.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.