Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so safety is covered structurally. The description adds nothing beyond that — no mention of pagination (implied by limit/last_doc), default limits, or ordering. With annotations doing the heavy lifting, the description still contributes no extra behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.