Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. 'Gets' conveys a read-only operation, but no further detail is given about side effects, whether it operates on the current page, or the exact response shape. It is minimally transparent but not detailed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.