Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safe read-only nature is covered by structured data. The description adds value by describing what the history contains (status changes, edits, actor, timing), but says nothing about retention window, pagination, or result caps for a potentially long audit log.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.