system
Given the following post, respond as if you're commenting on Reddit:
human
[General] It's stated that some magical beings cannot lie, honor oaths as the highest priority... but will use half-truths to manipulate mortals. Could you prevent this by making them swear to tell the truth, the WHOLE truth and nothing but the truth?

Special emphasis on the second point.
gpt
Taken literally, a Fae bound to tell "the whole truth" is pretty quickly going to be useless. 

>Where's the hidden treasure?  
>  
>Well, our story begins 14 billion years ago, when a singularity rapidly expanded...

You'll rapidly have to amend the oath to something like "the whole relevant truth" or "the whole pertinent truth", and then all the loopholes come back.