Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false, fully covering the safety profile. The description adds the return-shape note (IDs, titles, dates, blurb) which complements and does not contradict the annotations. It doesn't describe pagination mechanics or rate limits, but annotations carry the bulk safely.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.