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 only says 'Lists' without mentioning that this is a read-only operation, any side effects, pagination behavior, or return format. The mention of 'filtering criteria' hints at behavior but never explains how filtering is applied or whether results are ordered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.