Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple one-parameter delete tool, the description combined with annotations covers all necessary context: purpose, when to use, related tools, and safety profile. No output schema is needed for explaining return values, and the tool's behavior is fully disclosed through the description and annotations.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.