Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple list tool with full schema coverage, an output schema, and strong annotations, the description covers purpose, returns, and context. The only minor gap is that 'all boards' is technically constrained by the limit parameter, but the schema clarifies this, so it's not a significant omission.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.