Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, so the safety profile is covered. The description adds only the vague notion of a "preview", without saying what is previewed (counts of dependent objects? blocking links?), whether it is scoped to the caller's permissions, or how large the response can be. It contributes minimal context beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.