Here's a MWE:

#!/usr/bin/env python

from fire import Fire

class Example:
    def version(self):
        return "bla"
    def start(self):
        print("starting")
    def stop(self):
        print("stopping")

Fire(Example)

Running this script without arguments shows the available commands - OK:

NAME
    fire-bug.py

SYNOPSIS
    fire-bug.py COMMAND

COMMANDS
    COMMAND is one of the following:

     start

     stop

     version

But the more common (and usually safe) thing to do when a user is being introduced a new command, is to run it with a --help. However, Fire doesn't behave the same for this argument:

INFO: Showing help with the command 'fire-bug.py -- --help'.

NAME
    fire-bug.py

SYNOPSIS
    fire-bug.py -

Unless you use --verbose as well. Why is that? This is not trivial for a user to guess, and only reading the docs here led me to this conclusion. Plus, the docs don't mention how to make a class method a "public" method...