Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a filterable count tool with one entirely undocumented parameter, no annotations, and no output schema, the description leaves large gaps. It doesn't define filter syntax, result semantics, or usage context relative to sibling list tools, so an agent cannot fully rely on it without external knowledge.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.