Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple tool with one required parameter, clear annotations, and a single action, the description is largely complete. It covers purpose, usage guidance, and relation to siblings. Minor omission: no mention of error handling or idempotency behavior, but overall adequate for the tool's complexity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.