@type t() ::
  %ExBifrost.Model.CreateChatCompletion200ResponseChoicesInnerDeltaToolCallsInner{
    function:
      ExBifrost.Model.CreateChatCompletion200ResponseChoicesInnerDeltaToolCallsInnerFunction.t(),
    id: String.t() | nil,
    index: integer() | nil,
    type: String.t() | nil
  }