Sitecore rule engine condition to determine if the current user is in a particular engagement plan state

IsInEngagementStateCondition.cs

public class IsInEngagementStateCondition<T> : WhenCondition<T> where T : RuleContext
{
    public ID StateId { get; set; }

    protected override bool Execute(T ruleContext)
    {
        var automationStateManager = Tracker.Current.Session.CreateAutomationStateManager();
        return automationStateManager.IsInEngagementState(StateId);
    }
}