Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no annotations, no output schema, and no parameters, the description carries the entire burden of explaining behavior. It is too minimal for a state-changing trade action: it omits the sequence with related tools (e.g., trade_request, trade_accept, trade_commit), what locking entails, and any conditions or consequences.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.