Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a single-parameter deletion tool with destructive and idempotent annotations, the description is sufficiently complete: it covers what the tool does, when to use it, and the type of data involved. It does not mention return values, but there is no output schema, so this is not a significant gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.