Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple tool with one optional parameter and no output schema, the description covers the essential operational context: what happens, what it costs, and what the output status is. Some jargon is left undefined ('Scout→Critic→Arbiter', 'owner Studio run', 'host'), but an agent can still decide when and how to invoke it.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.