We learned that Israel was going to strike, so the US decided to jump on board. Do we know how long of a notice Israel gave the US? What you're attributing to as a thought out plan of attack seems to imply plenty of time. I don't think it's unreasonable for Israel to have learned of the meeting with little notice, deliberated internally for however long, and then told the US about it with not much time. I could totally see where under current Pentagon leadership, three clicks would have been the reaction. Yes, the US had been saber rattling and building pressure. That's probably part of why the Iranian leadership decided to meet. Whatever plans the US might have had went out the window when Israel called up and said we're striking now.