Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of explaining behavior. It discloses the tool is informational (read this to attribute) and lists the fields returned. This makes the read-only, non-mutating nature clear, though it does not describe the exact format of the citation or licence fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.