Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description carries full burden. It states the return values (Employee ID and manager ID) but does not disclose side effects, prerequisites (e.g., employee existence), or error behavior. For a simple read operation, this is minimally adequate but lacks depth.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.