/**
 * Google API error structure (from gaxios)
 */
export interface GoogleApiError extends Error {
    code?: number;
    status?: number;
    errors?: {
        message: string;
        domain: string;
        reason: string;
    }[];
    response?: {
        data?: unknown;
        status?: number;
        statusText?: string;
    };
}
/**
 * Type guard for errors with a message property
 */
export declare function isErrorWithMessage(error: unknown): error is {
    message: string;
};
/**
 * Type guard for Google API errors with code/status
 */
export declare function isGoogleApiError(error: unknown): error is GoogleApiError;
/**
 * Get error message from unknown error
 */
export declare function getErrorMessage(error: unknown): string;
/**
 * Get error details for logging
 */
export declare function getErrorDetails(error: unknown): Record<string, unknown>;
/**
 * Format error for tool response
 */
export declare function formatToolError(toolName: string, error: unknown): string;
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