Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the simplicity of the tool (no parameters, no output schema), the description is mostly sufficient. It clearly states the action, and the lack of further detail is acceptable for a straightforward selection operation. However, it could benefit from a note about affecting the current sequence, but this is not critical.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.