Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Since no annotations are provided, the description carries the behavioral burden, and it does disclose the exact metadata fields returned: source, computed date, licence, and citation. It omits output formatting details, but for a static, side-effect-free metadata lookup this is adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.