Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It usefully discloses the key consequence ("tokens will stop working"), but omits whether deactivation is reversible, what permissions are required, and whether the user's data survives. Partial disclosure only.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.