Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It states it's a 'Set' operation, implying mutation, but doesn't cover critical aspects like required permissions, whether changes are reversible, error conditions, or what happens if indices are invalid. This is a significant gap for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.