Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a zero-parameter state management tool without output schema, the description adequately covers the essential context: what it does, the immediate effect on system behavior (search scope), and performance characteristics. It could be improved by explicitly naming affected operations like searchComments or readComments, but 'comment search' provides sufficient context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.