Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of explaining behavior. It does disclose the exact kind of data returned and the expected downstream usage, which is helpful. However, it never explicitly states that this is a read-only retrieval operation, nor does it mention potential errors or limitations, leaving some behavioral ambiguity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.