Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no output schema, the description takes on the burden of explaining return content, which it does thoroughly by listing health score, risk flags, link quality breakdown, anchor text profile, top and risky backlinks, and outbound link summary. The sampling caveat adds essential context for interpreting results. For a read-only tool with one input, the description is complete enough for an agent to invoke it correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.