Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description bears full responsibility for disclosing behavior. It only states the return format {id, name, timezone} but lacks details about authentication requirements, rate limits, or safety profile. The reader cannot infer if this is a read-only operation or has side effects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.