/**
 * Passive availability detection with 3-strike circuit breaker.
 *
 * The tracker never polls engram — it only records outcomes of calls
 * that the client already makes. After 3 consecutive failures the server
 * is marked unavailable for a 60-second cooldown period, after which the
 * next call is allowed through as a probe.
 */
export declare class AvailabilityTracker {
    private consecutiveFailures;
    private unavailableSince;
    /**
     * Record a successful call. Resets the failure counter and restores
     * availability if the server was in cooldown.
     */
    recordSuccess(): void;
    /**
     * Record a failed call. After STRIKE_THRESHOLD consecutive failures
     * the server enters a cooldown period.
     */
    recordFailure(): void;
    /**
     * Returns true if the server is considered available.
     *
     * After the cooldown period expires the server is tentatively considered
     * available again so that the next call can act as a probe. If that call
     * succeeds, `recordSuccess()` completes the recovery. If it fails,
     * `recordFailure()` restarts the cooldown immediately.
     */
    isAvailable(): boolean;
    /** Remaining cooldown in milliseconds, or 0 if available. */
    remainingCooldownMs(): number;
}
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