Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no parameters and no output schema, the description should carry more of the return-shape burden — an agent cannot tell from this text whether entries are window titles, IDs, counts, or process handles, nor what an empty result means. The mechanism (loopback CDP) is a helpful hint but the result contract is left implicit.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.