func RunTool(cfg)
{
    //cfg.Project is the project Subdirfilesystem
    //cfg.ProjectInfo is the info property parsed from the cross.json file in project root
    cfg.GeneratedSource.Add({
        Source = "func times(a,b){return a * b;}",
        FileName = "times.tcross"
    });

    //this runs with full access to vm so be careful when allowing these
}