Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It merely states the action and scope but does not disclose any behavioral traits such as pagination, read-only nature, error conditions, or required permissions. As a simple list operation, the lack is moderate but still a gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.