It was the agreement that allowed them to enrich uranium to 60% and had no on the spot inspections.
IAEA had 24/7 access to key sites and it is literally was the most panopticon possible inspection regime. Nothing negotiated previously had that amount of oversight or access.
They could enrich uranium to any level previously and it would of taken a year to have bombs, vs months that it would now take. The IAEA in all their documents indicated Iran was sticking to the plan.
Literally the only reason to rip it up is trumps ego. It avoided war at the time, something Trump couldn't do as he is a terrible negotiator.
Ripping up the deal was retarded on every level. We now have a war resulting directly from that piss poor decision which is fucking the global economy amongst other things.
There is also no evidence they were close, so this war is nonsense. Noem stated as much, witkoff the realtor said they had it but who the fuck is that guy?