Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare this is a non-read-only but non-destructive, idempotent, closed-world mutation. The description adds real context beyond that: prerequisite checks on skills, source approvals, and readiness/billing gates, plus the fact that it returns a background task rather than a completed deployment. It stops short of describing failure modes, error surfaces, or what the preview contains.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.