Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple read tool with one parameter and an output schema, the description covers the return values (option labels, tally, state, user vote info), behavioral nuances (tally visibility), authentication requirements, and error cases. It is entirely adequate for an AI agent to use correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.