Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The tool has no output schema, so the description should explain what the caller can expect (e.g., response body, success/failure behavior, idempotency). It provides none of this. Additionally, there is no mention of relationships to other group operations (e.g., when to use remove vs. add). For a mutation tool with minimal annotations, this is incomplete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.