Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful data-coverage context by disclosing the fields returned and that price/full nutrition are absent. It says nothing about pagination, rate limits, or result ordering, so it adds some but not rich behavioral detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.