I have a simple Click app like this: import click @click.command() @click.argument('message') def main(message: str): click.echo(message) if __name__ == '__main__': main()  When you pass an environment variable in the argument, it expands it: ➜ Desktop python foo.py '$M0/.viola/2025-01-25-17-20-23-307878' M:/home/ramrachum/.viola/2025-01-25-17-20-23-307878  Note that I used single quotes above, so my shell is not expanding the environment variable, Click does. How do I get Click to not expand it?
The solution is to pass windows_expand_args=False when calling the main command.