Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered upstream. The description adds nothing beyond restating the API source: no note on pagination, result caps, rate limits, or what a search returns. 'via Jikan API' is the only added context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.