Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the moderate complexity of an upload operation and the presence of annotations (destructive, idempotent), the description is minimally sufficient but omits important details such as whether the bucket must already exist, behavior on overwriting, and return value. These gaps are partially mitigated by the annotations and schema, but a more complete description would include prerequisites and side effects.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.