Get list of valid arguments or "actions" for a command

Is there a way to list the valid arguments for a rhino command if it is not in documentation anywhere?

I have loaded a plugin that no documentation for commands. If I run one of the commands in the command line, it follows with the prompt: “Action:”, but I don’t know the valid available actions/arguments. Anything I enter at this prompt causes the command to quit because, I assume, the actions are invalid.

Is it possible to query the command for a list of valid actions, or to print the command arguments somehow?

Thank you!

If it is a .net plugin, you could decompile it, but other than that, no.
Or open it in a text or hex editor and look at human readable strings.

Have you tried contacting the developer?