Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds one genuine behavioral trait beyond the annotations: results are ordered by weight. It says nothing about scope, pagination limits, or how many nodes exist, but with annotations carrying the safety burden this is minimally acceptable.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.