Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure, but it only restates the output content. It does not mention whether the operation is read-only, how supplying or omitting the 'option' parameter changes the result, what shape the returned data takes, or any other behavioral traits beyond the literal content.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.