Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden, and it does disclose the return shape (paths plus SHA-256 hashes) and hints that artifacts may not all exist ('every available'). It does not say what happens if the job is unknown, still running, or has no artifacts, nor whether the call is read-only, so meaningful gaps remain.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.