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. 'Get list' implies a read operation, but it doesn't disclose important traits like whether this requires authentication, has rate limits, returns paginated results, or what happens with the parameters. The description adds minimal value beyond the basic operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.