Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple list tool with no required parameters and no output schema, the description is minimally adequate, but it lacks any context about what 'linked Yandex accounts' means, how the response is structured, or whether authentication is required. Given the tool's simplicity, a slightly richer description (e.g., 'Returns a list of Yandex accounts linked to the current user') would make it complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.