Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral burden, and 'Get' makes the read-only nature clear. It does not describe handling for missing IDs, error responses, or exact return content, but for a simple get-by-id lookup there are no hidden side effects or pagination concerns.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.