Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare the operation as read-only, idempotent, and non-destructive, so the safety profile is covered. However, the description adds no additional behavioral context such as pagination, ordering, or whether results are live or cached, leaving the tool's runtime behavior fairly opaque.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.