Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, but the description adds substantially more: slot freeing behavior, the stop-vs-delete distinction, the exact error_type returned, and the critical warning that deletion closes all open positions. This goes well beyond what annotations provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.