Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure, and it discloses nothing. It does not say whether aborting is destructive, whether the task can be resumed, what state the task is left in, or whether the call is idempotent on an already-finished task.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.