Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. 'List' implies a read operation, but there's no information about permissions required, rate limits, output format, pagination, or what constitutes 'Authenticated Users' in this context. The description provides only the most basic functional statement without behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.