Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnlyHint=true and destructiveHint=false, lowering the burden. The description adds useful behavioral context by stating the result is limited to authorized leads and explicitly excluding notes, budget, and internal summaries—information an agent would not get from annotations alone.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.