Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the full behavioral burden. It states the destructive action ('Remove') but omits consequences like whether remaining FX indices shift, whether the operation is undoable, or what errors occur for invalid indices.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.