Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations at all, the description carries the full burden, and 'Remove trace' only signals that the operation is destructive. It does not disclose whether removal is permanent, whether it affects other data, what happens if the trace does not exist, or any permission requirements.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.