Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, idempotentHint=false, and readOnlyHint=false, so the danger profile is covered by structured data. The description adds no behavioral detail beyond that — nothing about whether partial writes survive, what happens if the op finished already, or what a successful response contains. Against an already-strong annotation set, this is the expected minimum, not a gap that sinks it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.