Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description discloses useful operational context the annotations do not: cost ('Free, no key'), auth posture, and the reuse of licenses already held on the account. Annotations already carry the safety profile (readOnlyHint=false, destructiveHint=false), so this is adequate rather than rich; no rate-limit or storage detail is given.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.