Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no output schema, no annotations, and two opaque parameters, the description is incomplete for a state-changing session teardown. An agent cannot determine data-loss risk, how close_mode behaves, what success looks like, or whether the session is reusable, leaving critical operational uncertainty.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.