import { ProviderMessage, ProviderResponse, LLMProvider, ChatOptions, StreamDelta } from './types.js';
import type { ToolDefinition } from '../tools/interface.js';
export declare class OpenAIProvider implements LLMProvider {
    private client;
    private model;
    constructor(apiKey: string, model: string, baseURL?: string);
    chat(messages: ProviderMessage[], tools: ToolDefinition[], options?: ChatOptions): Promise<ProviderResponse>;
    /**
     * Stream the response using the OpenAI SDK's native streaming. Maps chunks to
     * `StreamDelta`s: text deltas, tool-call begin (id+name on the first chunk)
     * and argument fragments (subsequent chunks, keyed by `index`), and a final
     * `finish` with usage (when `stream_options.include_usage` is set).
     */
    chatStream(messages: ProviderMessage[], tools: ToolDefinition[], options?: ChatOptions): AsyncIterable<StreamDelta>;
}