Response

return value will be dict or None

def main(event={}):
    data = event.get("data", {})
    new_min = data["min"] * 2
    new_max = data["max] * 2
    cmds.playbackOptions(min=new_min, max=new_max)
    print("{} - {}".format(new_min, new_max))

    update_context = {"min": new_min, "max": new_max}
    return {"return_code": 0, "update_context": update_context}

key	default	type	description
return_code	0	int	result for task process
update_context	{}	dict	update context
break_on_conditions	False	bool	if True, stop all process except closure step

return code

id	results	description
0	Success
1	Error
2	skipped
4	Import Error	task was not found in sys.path
5	Key Error	required key was not exists(optional)

update context

add value to context

sample of break on conditions

when start frame is lower then 0, stop the other tasks

def main(event):
    if cmds.playbackOptions(min=True, q=True) < 0:
        return {"return_code": 0, "break_on_conditions": True}
    return {"return_code": 0}