Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple two-parameter write operation, the description covers the essential context: who performs the action, what is required, the write nature, confirmation requirement, and idempotency. It does not describe return values, error cases, or capacity checks, but with only two parameters and annotations present, this is adequate.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.