export interface ChatTitleRequest {
    message: string;
    appId?: string;
    /**
     * The engine and model the thread's turn was sent with. Without them the
     * title runs on the deployment's default model, which the user's own key
     * may not be able to call.
     */
    engine?: string;
    model?: string;
}
export declare function chatTitleRequestFromBody(body: unknown): ChatTitleRequest | null;
/** A 3-6 word tab title for a chat's first message. Throws when the model call fails. */
export declare function generateChatTitle(request: ChatTitleRequest): Promise<string>;