Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered without description text. The description adds that results are lightweight (title plus slug rather than full page bodies), which usefully signals why you might choose this over other surface area, but says nothing about ordering, pagination, or emptiness handling.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.