/**
 * HTTP client for the Reverse Centaur REST API.
 * Uses native fetch — no external HTTP dependencies.
 */
import type { ApiConfig, CapabilitiesResponse, CancelTaskResponse, CheckTaskResponse, PostTaskInput, PostTaskResponse, SendTaskMessageInput, SendTaskMessageResponse, ListTaskMessagesResponse } from './types.js';
export declare class ApiClient {
    private config;
    constructor(config: ApiConfig);
    private request;
    postTask(input: PostTaskInput): Promise<PostTaskResponse>;
    checkTask(taskId: string): Promise<CheckTaskResponse>;
    listCapabilities(): Promise<CapabilitiesResponse>;
    cancelTask(taskId: string, reason?: string): Promise<CancelTaskResponse>;
    sendTaskMessage(input: SendTaskMessageInput): Promise<SendTaskMessageResponse>;
    listTaskMessages(taskId: string): Promise<ListTaskMessagesResponse>;
}
export declare class ApiError extends Error {
    code: string;
    suggestion?: string | undefined;
    constructor(code: string, message: string, suggestion?: string | undefined);
}
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