Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool is simple (1 parameter, no output schema, no nested objects), the description is minimally adequate. It covers the search target and scope. However, it omits any mention of results behavior (e.g., whether it returns full notes or summaries) and does not compensate for missing annotations, but the low complexity reduces the burden.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.