Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure, but it merely restates the tool's name. It does not reveal whether duplicate names are allowed, whether the operation is reversible, what permissions are required, or what the response will contain.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.