Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple one-parameter mutation tool with annotations and full schema coverage, the description provides purpose, usage contrast, authorization, idempotence, and cost context. It does not mention the return value or success/failure behavior, but with no output schema defined, this is a minor gap; the description is sufficiently complete for an agent to select and invoke the tool correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.