/**
 * Concurrent Session Limit Error
 *
 * Thrown by InteractiveSessionService.startSession() when the number of
 * active sessions (status 'booting' or 'ready') has reached the configured
 * maximum. The API route translates this to HTTP 429.
 */
export declare class ConcurrentSessionLimitError extends Error {
    readonly activeSessions: number;
    readonly cap: number;
    constructor(activeSessions: number, cap: number);
}
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