@User: Magic just runs a Tcl interpreter (actually magic installs itself as an extension of a Tcl interpreter), so anything you can do in Tcl is valid. So yes, it can call external programs, and it can execute Tcl scripts (via the "source" command, as @User noted).
Linen is a search-engine friendly community platform. We offer integrations with existing Slack/Discord communities and make those conversations Google-searchable.