Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare idempotentHint=true and destructiveHint=false, and the description reinforces this by noting accepted-order terms are preserved, which is consistent with the non-destructive hint. It adds real context beyond annotations (login + owner-only restriction, preview/confirm gate, refund ≠ credit), though it does not describe the response payload or what data a preview returns.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.