@type t() :: %ExBifrost.Model.CohereChatV2200ResponseDeltaMessage{
  citations:
    ExBifrost.Model.CohereChatV2200ResponseDeltaMessageCitations.t() | nil,
  content: ExBifrost.Model.CohereChatV2200ResponseDeltaMessageContent.t() | nil,
  role: String.t() | nil,
  tool_calls:
    ExBifrost.Model.CohereChatV2200ResponseDeltaMessageToolCalls.t() | nil,
  tool_plan: String.t() | nil
}