Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
There are no annotations, so the description carries the behavioral burden. It clearly indicates a read-only informational operation ('Read this') and specifies exactly what information will be exposed: source, date computed, licence, and citation. For a zero-parameter metadata tool, this is sufficient transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.