import { OpenAI } from 'openai';
/**
 * Set the default OpenAI API key.
 * @param key - The API key to set as default
 */
export declare function setDefaultOpenaiKey(key: string): void;
/**
 * Get the default OpenAI API key.
 * @returns The default API key or null if not set
 */
export declare function getDefaultOpenaiKey(): string | null;
/**
 * Set the default OpenAI client.
 * @param client - The OpenAI client to set as default
 */
export declare function setDefaultOpenaiClient(client: OpenAI): void;
/**
 * Get the default OpenAI client.
 * @returns The default OpenAI client or null if not set
 */
export declare function getDefaultOpenaiClient(): OpenAI | null;
/**
 * Set whether to use responses by default.
 * @param useResponses - Whether to use responses by default
 */
export declare function setUseResponsesByDefault(useResponses: boolean): void;
/**
 * Get whether to use responses by default.
 * @returns Whether to use responses by default
 */
export declare function getUseResponsesByDefault(): boolean;