Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It does disclose a meaningful behavioral trait — that invocation triggers escrow payout to the seller at 0% platform fees — which is real value beyond the schema. But it omits prerequisites, irreversibility of the fund release, and what state the task transitions to, so the disclosure is partial.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.