Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations indicate this is not read-only and not destructive, which the description doesn't contradict. The description adds minimal behavioral context beyond annotations - it mentions 'multiple messages at once' and the batch operation nature, but doesn't address rate limits, authentication needs, or what happens to forwarded messages (e.g., whether they retain original metadata).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.