Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the complexity (a destructive delete operation with a boolean parameter affecting behavior), lack of annotations, 0% schema description coverage, and no output schema, the description is incomplete. It doesn't address what an event subscription is, the consequences of deletion, how to identify the subscription_id, or what the tool returns. For a mutation tool with undocumented parameters, more context is needed to be minimally viable.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.