Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It is transparent about what the tool returns: source, computed date, licence, and citation. It implies a read-only metadata operation by saying 'Read this,' and no side effects are suggested. It could mention output format, but the content disclosure is sufficient for this simple tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.