Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is covered. The description adds genuinely new behavioral context: revocation is permanent and existing instances keep their own credentials, which clarifies blast radius in a way annotations cannot.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.