Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and readOnlyHint=false, and the description adds the context that a session credential file is deleted. However, it does not disclose any additional behavioral traits such as whether deletion is permanent, requires confirmation, or fails if the session doesn't exist. With annotations present, this minimal addition is acceptable but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.