Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly=false, idempotent=false, destructive=false, and openWorld=true, so the safety profile is covered by structured data. The description adds nothing beyond this – it does not mention that repeated calls create duplicate comments (non-idempotent), whether the author is attributed, whether notifications fire, or what happens on an invalid task id.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.