/**
 * Durable prompt scheduler — recurring or one-shot prompts that fire as
 * synthetic user inputs at turn boundaries (via the input multiplexer).
 */
export interface ScheduledTask {
    id: string;
    prompt: string;
    /** Seconds between firings. Minimum 60. */
    intervalSec: number;
    /** Recurring tasks re-arm after each firing; one-shots disable. */
    recurring: boolean;
    /**
     * Durable tasks persist across sessions: if a firing was missed while no
     * session was running, the next session start fires it once (catch-up).
     * Non-durable tasks live only as long as the session that created them.
     */
    durable: boolean;
    createdAt: number;
    /** Hard expiry — the task stops firing and is pruned after this. */
    expiresAt: number;
    nextFireAt: number;
    lastFiredAt?: number;
    firedCount: number;
    enabled: boolean;
    /** Session that created the task — owner of non-durable tasks. */
    sessionId: string;
}
export declare const MIN_INTERVAL_SEC = 60;
export declare const MAX_LIVE_TASKS = 50;
export declare const DEFAULT_TTL_MS: number;
/**
 * Parse "90s" / "5m" / "2h" / "1d" into seconds. Bare numbers are seconds.
 * Returns null for unparseable input; callers surface usage help.
 */
export declare function parseInterval(text: string): number | null;
export declare function formatInterval(sec: number): string;