Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden, and it only gestures at traits via unexplained jargon: 'bounded recovery' and 'ID deduplication' hint that replay is limited and duplicate items are filtered, but no bounds, error behavior, idempotency, or resulting state change is disclosed. Nothing tells the agent what happens if the watch is already running or if the watch_id does not exist.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.