Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false and destructiveHint=false, so the agent knows this is a mutation. The description adds no further behavioral context (e.g., whether assignments are overwritten, required permissions). It does not contradict annotations, but it also doesn't go beyond them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.