Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of explaining side effects. 'Deploy' implies mutation, but the description does not disclose whether this creates a new service, updates an existing one, restarts containers, or is destructive. It also says nothing about authentication, rate limits, or output behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.