Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=true, so the mutation profile is known. The description adds nothing: it does not say the source preset is unchanged, whether the copy gets a new ref_id/name, or whether related objects are cloned.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.