Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple 4-parameter tool with full schema coverage, an output schema, and meaningful annotations, the description is complete. It covers the key context beyond the schema: scope is tied to the API key's inventory, and account verification is required. Nothing critical is missing for an agent to invoke it correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.