Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry behavioral disclosure, and it does establish the two most important traits: the operation is read-only and it must not re-issue a save (idempotency safety). It stops short of stating what the fence observes, whether it acquires or releases ownership, or what the caller should expect on success versus a dead worker.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.