Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Discloses the rate limit (once per workspace every 4 hours), the non-error cooldown response shape (queued: false with cooldownSecondsRemaining), and the asynchronous background execution model with a required polling step. This is far beyond what the annotations state and resolves the tension with readOnlyHint=false by explaining the call changes no content.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.