Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnlyHint=false, destructiveHint=false, and idempotentHint=true, so the description's mutation intent is consistent. It adds the WRITE_ENABLED=true precondition, which is useful context, but does not mention return values, partial update behavior, or error conditions. The added context is modest and does not contradict annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.