Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (1 param, no output schema), a description of one line might be acceptable, but it fails to explain the nature of the returned permissions (e.g., roles, direct permissions) or the significance of 'current user'. Sibling tools with similar names require more differentiation. The description is incomplete for an agent to fully understand the tool's context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.