Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Since no annotations are provided, the description carries the burden of behavioral disclosure. It does reveal the heuristic keyword-matching mechanism and the probabilistic 'likely' nature, which is useful. Yet it omits return format, ordering, and false-positive caveats, leaving some behavioral ambiguity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.