Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate destructive and non-read-only behavior. The description adds valuable scoping context beyond the annotations: the site is not destroyed, only the custom hostname is detached, and the default subdomain remains active. This meaningfully clarifies the blast radius of the operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.