Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, so the safety profile is covered. The description adds meaningful behavioral context beyond that: this is an asynchronous, staged operation you poll, and results only materialize "once done" as rendered clips with scores and download links. It stops short of polling cadence or terminal-state guidance.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.