swift -help reports options not available for all swift subcommands without distinguishing them.

[dabrahams]

For example, -working-directory looks really promising for being able to invoke swift run on a package from outside its working copy. In fact, no dice: if you put the option before run then run is interpreted as the name of a swift file. If you put it after, you get

error: Unknown option '-working-directory'
Usage: swift run [<options>] [<executable>] [<arguments> ...]
  See 'run -help' for more information.

Most tools that have subcommands have a list of universal options and then options for specific commands, and they make the distinction clear in the help. I realize swift is a little different as you want to be able to say swift SomeFile.swift with no command. Maybe you could say there's an implicit command run-script when the thing that would otherwise be a command name has a .swift extension.