Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has no parameters and no output schema, the description is minimally adequate. It specifies the input (none needed) and high-level output (captured errors). However, it does not describe the format of the errors, whether the data is truncated, or if reading clears the buffer. For a simple read tool, this is acceptable but leaves some ambiguity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.