Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish the behavior profile (readOnlyHint=false, idempotentHint=false, openWorldHint=true), so the description is not required to repeat them. However, it adds no behavioral context at all: no statement that this mutates an existing conversation's feedback state, whether repeat calls are allowed, or who may submit feedback. It does not contradict the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.