Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of behavioral disclosure. It communicates that this is a read-only retrieval, but it adds little beyond that—no mention of return value, error conditions, or system-level effects. For a simple getter this is minimally adequate, but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.