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 explicitly lists what the tool returns (source, computed date, licence, citation) and signals a read-only intent via 'Read this.' This is sufficient for a simple provenance tool, though it does not describe exact output formatting.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.