import type { ApiError } from './types';
/**
 * Error thrown when the AgentCall API returns a non-2xx response.
 *
 * @example
 * ```typescript
 * try {
 *   await client.numbers.provision({ type: 'tollfree' })
 * } catch (err) {
 *   if (err instanceof AgentCallError) {
 *     console.error(err.code)       // 'plan_limit'
 *     console.error(err.statusCode) // 403
 *   }
 * }
 * ```
 */
export declare class AgentCallError extends Error {
    /** Machine-readable error code (e.g. `plan_limit_voice_ai`, `not_found`, `rate_limited`). */
    code: string;
    /** HTTP status code from the API response. */
    statusCode: number;
    /**
     * On plan-gate errors: absolute URL where a human can upgrade to Pro.
     * Undefined on every other error.
     */
    upgradeUrl?: string;
    /**
     * On plan-gate errors: the MCP tool (`upgrade_to_pro`) an agent can run to
     * get a checkout link. The SDK equivalent is `client.account.upgrade()`.
     */
    upgradeToolName?: string;
    constructor(error: ApiError);
}
/** @internal Send an authenticated HTTP request to the AgentCall API with automatic retry. */
export declare function request<T>(baseUrl: string, apiKey: string, method: string, path: string, body?: unknown, timeout?: number): Promise<T>;
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