Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple list operation with zero parameters and an existing annotation profile, the description covers the essential context: what it lists, that it is read-only, and authentication requirements. It does not describe the return format or pagination, but for a tool with no parameters and no output schema, this is not a critical gap. It is adequately complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.