Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a tool with no annotations, no output schema, and 0% schema description coverage, the description is completely inadequate. It doesn't explain what the tool does, when to use it, what parameters mean, what behavior to expect, or what results will be returned. Given the complexity implied by the name and sibling tools, this leaves the agent with insufficient information.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.