Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a tool with 5 parameters, nested dimension objects, two scene variants, and an output schema, the description covers everything an agent needs to call it correctly: prerequisites, unsupported forms, preservation semantics, code stability, removal constraints, and clearing behavior. Return values are already handled by the output schema, so their absence from the description is not a gap. The only minor omission is explicit error behavior for invalid references, which the schema partially covers ('Each code must exist in the form').
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.