Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already state readOnlyHint=false, idempotentHint=true, openWorldHint=true, destructiveHint=false, so the agent knows this is a non-destructive, idempotent, open-world write. The description contributes nothing further: not whether the whole resource is replaced versus merged, not authorization requirements, not side effects on related PMBOK objects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.