Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The tool is simple with one well-documented parameter and an output schema present. The description, combined with schema and annotations, provides enough information for basic usage. However, it lacks any note about potential preconditions (e.g., not already being friends) or the outcome of the request, which would make it more complete, but given the simplicity, it is nearly sufficient.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.