Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a zero-parameter, annotation-rich tool, the description is mostly complete. It specifies the output format ({matchweek}) and the static nature. However, it does not explain what a matchweek number is or how it might be used (e.g., for scheduling comparisons), which could be helpful for an agent unfamiliar with the domain. Given the simplicity, this is a minor gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.