Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It only states that it generates a prompt; it doesn't disclose whether this is a read-only operation, whether it has side effects, or what the output format is. For a tool that likely triggers further agent actions, this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.