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 clearly lists what data will be returned, but it does not explicitly mention that this is a read-only operation, nor does it disclose any potential errors, permission requirements, or limitations. The getter semantics are implied but not stated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.