Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds value by disclosing the payload contents (address, what to order, rank, guide, co-recommenders), but says nothing about behavior when no review exists for that place/curator pair or about lookup-by-name vs id fallback semantics.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.