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-only list operation but does not confirm it, nor does it describe return format, pagination, authentication requirements, or rate limits. For a tool with zero parameters and no output schema, more context is needed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.