/** Authentication failures safe to expose across CLI, MCP, and browser runners. */
export declare class SessionAuthError extends Error {
    readonly code: 'NEX_AUTH_REAUTH_REQUIRED' | 'NEX_AUTH_TEMPORARY' | 'NEX_SESSION_EXPIRED' | 'NEX_AUTH_INVALID' | 'NEX_AUTH_ORIGIN_CHANGED';
    readonly remediation: string;
    constructor(code: 'NEX_AUTH_REAUTH_REQUIRED' | 'NEX_AUTH_TEMPORARY' | 'NEX_SESSION_EXPIRED' | 'NEX_AUTH_INVALID' | 'NEX_AUTH_ORIGIN_CHANGED', remediation: string);
}