Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so the bar is lower, and the description adds meaningful context beyond that: private source bodies and blob locations are not exposed, paid canary/full generation/publication are distinct receipt-gated stages, and the tool uses the existing CogentCast service without minting approvals or publishing. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.