Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, idempotentHint and destructiveHint=false, so safety is covered. The description adds nothing beyond them — no mention of what the Yelp API returns, authentication expectations for api_key, rate limits, or whether start_date is an epoch timestamp. For an external API tool it is thin.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.