Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple list tool with one parameter and no output schema, the description adequately conveys the purpose, output stats, and authentication need. It is missing details like pagination or filtering, but the tool's simplicity and sibling context (e.g., get_referral_code) make it sufficiently complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.