Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Despite having annotations, the description adds valuable behavioral context beyond them: the reply 'inherits the original entity, topic, or section target,' is 'labeled Agent,' and 'never changes the KG.' These traits are not derivable from the annotations and meaningfully inform the agent of side effects and scope.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.