Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple two-parameter, read-only, idempotent tool with an output schema, the description is nearly complete: it gives purpose, material-count limit, and cost. It could more explicitly distinguish itself from prepare_instant_brief_request, but the title and sibling context reduce that gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.