Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It transparently indicates a read operation ('Returns') and single-task granularity, but it does not disclose not-found behavior, whether deleted/restored tasks are included, or any authorization requirements. Adequate but shallow.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.