Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It communicates that the tool enumerates all jobs run in the current session, which is useful, but it does not mention whether the operation is read-only, whether results include failed jobs, or any other behavioral nuance. The listing behavior itself is reasonably transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.