Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple read-only tool with two parameters, no output schema, and good annotations, the description covers the key aspects: what is returned (rendered HTML), the version scoping, and the access requirement. It could potentially describe return behavior in more detail, but 'Serve' and 'text/html' sufficiently convey the output. Overall, the description is complete enough for an agent to invoke the tool correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.