And Tcl has had a safe interpreter feature and a sophisticated policy mechanism from early on. It was used in the Tcl browser plugin, which routinely downloade

And Tcl has had a safe interpreter feature and a sophisticated policy mechanism from early on. It was used in the Tcl browser plugin, which routinely downloaded code from the Web and executed it. The plugin is gone but the safe interpreter and policy interface are still perfectly functional. Tcl also had several agent extensions back in the 1990's.