Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a two-parameter mutation with no annotations and no output schema, the description covers purpose, actor, precondition, and the receipting side effect. It is not complete enough to call safely, though, since the unexplained 'reason' parameter and the absence of any failure/reversibility guidance leave real gaps.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.