Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple one-parameter tool, the description is minimally viable. It states the action and target. However, without annotations or an output schema, it lacks context about what the index is, what changes occur, and when to use it relative to the sibling index tools. Given the complexity, more would be helpful but not strictly required.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.