Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Despite the tool's simplicity (1 param, no output schema), the description lacks information about the return value. Without specifying what 'users' means (e.g., list of user objects, IDs, etc.), the agent is left guessing. The context signals indicate no output schema, so the description should compensate, but it does not.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.