Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple read-only search tool with full schema coverage and an output schema, the description is sufficient. It states the core function, and the structured data covers parameters and return values. However, it could have added a bit more contextual guidance, such as typical use cases, to be more helpful.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.