*Disclaimer: I am NOT a lawyer! Consult a lawyer!*
Don't bother with this. A legit lawyer would never agree to draft an agreement like this.
A narcissist thinks they are smarter than anyone else, so they're going to find a loophole and do whatever they want, to remain (at least in their own minds) within the letter of the law, if not the spirit of the law.
And, finally, narcissists don't like being told what to do, so they will resent this restriction on their “freedom “
You are better off documenting whatever threats have been made and getting a restraining order from a judge.
And then it will be your responsibility to document and call the police each and every time the narcissist attempts to violate the order.
Now that you realize this person hates you enough to want you dead, perhaps it is time to think of exiting the relationship. Make a plan and get safe.
*Disclaimer: I am NOT a lawyer! Consult a lawyer!*
Editing to add: Posts tagged 'quora' were originally my answers to peoples' questions on quora.com. They were monetized but I am giving them away for free here.
If you feel inclined to support my writing, here's my paypal
And if you prefer to pay it forward, I recommend Safe Place as an excellent place to support.