Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The tool is simple with 0 parameters and no output schema, so the description lists the expected return contents (email, user ID, token expiry), which provides a reasonable picture. However, it omits potential error cases or unusual behavior (e.g., if not authenticated), making it slightly incomplete for a tool with no annotations or output schema.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.