Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden, and it delivers marketing claims instead: "Save hours every week" and "battle-tested" convey no information about output format, length, side effects, or determinism. Nothing tells an agent what a call returns or what happens to the optional query, so an agent cannot predict the result before invoking it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.