Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare the full safe-read profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint=false), so the safety burden is covered. The description adds the returned fields but says nothing about pagination behavior or defaults despite limit/offset being present.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.