/**
 * @license
 * Copyright 2025 OSAgent OC
 * SPDX-License-Identifier: Apache-2.0
 */
export declare function isNodeError(error: unknown): error is NodeJS.ErrnoException;
export declare function getErrorMessage(error: unknown): string;
export declare class FatalError extends Error {
    readonly exitCode: number;
    constructor(message: string, exitCode: number);
}
export declare class FatalAuthenticationError extends FatalError {
    constructor(message: string);
}
export declare class FatalInputError extends FatalError {
    constructor(message: string);
}
export declare class FatalSandboxError extends FatalError {
    constructor(message: string);
}
export declare class FatalConfigError extends FatalError {
    constructor(message: string);
}
export declare class FatalTurnLimitedError extends FatalError {
    constructor(message: string);
}
export declare class FatalToolExecutionError extends FatalError {
    constructor(message: string);
}
export declare class FatalCancellationError extends FatalError {
    constructor(message: string);
}
export declare class ForbiddenError extends Error {
}
export declare class UnauthorizedError extends Error {
}
export declare class BadRequestError extends Error {
}
/**
 * Error thrown when API credential validation fails.
 * Contains provider-specific information and helpful suggestions.
 */
export declare class CredentialValidationError extends Error {
    readonly provider: string;
    readonly reason: string;
    readonly suggestion: string;
    readonly originalError?: Error | undefined;
    constructor(provider: string, reason: string, suggestion: string, originalError?: Error | undefined);
    /**
     * Get a user-friendly error message with suggestion
     */
    getFullMessage(): string;
}
export declare function toFriendlyError(error: unknown): unknown;