My manager announced my promotion before I agreed to take it

I learned that I had been promoted from a message in the department chat.

My manager wrote: “Please congratulate Elena, who will be stepping into the regional lead role next month.” Coworkers added celebration emojis. Two people messaged me privately to say the team was lucky to have me.

I had not accepted the role.

My manager and I had discussed it once. He described the position broadly and asked whether I was interested. I said I was open to learning more. I asked about pay, travel, direct reports, and whether I would keep my current client portfolio. He said those details were still being worked out.

Apparently, “open to learning more” became yes.

After the announcement, he called and apologized for getting ahead of the paperwork. He said leadership wanted to share good news before a quarterly meeting and assumed I would be excited. He then gave me the proposed salary increase, which is smaller than I expected, and confirmed that the role includes monthly travel and management of four people.

I might still want it. The work is interesting, and I have wanted more responsibility. But the announcement changed the negotiation. Declining now would no longer be a private career decision. It would be a reversal that requires an explanation to coworkers who have already congratulated me.

My manager says nothing is final until I sign the letter. He also keeps referring to the role as mine in planning meetings.

I asked him to correct that language until I decide. He said doing so would confuse people and suggested that I focus on whether the opportunity is right rather than on the communication mistake.

The communication mistake is part of whether the opportunity is right. A manager who announces consent before receiving it has shown me something about how he handles pressure and assumptions.

I plan to evaluate the role on its actual terms and request two business days with the written details. I also want him to tell the leadership team that the appointment is pending, even if he does not issue a dramatic public correction.

Would you continue negotiating as though the announcement had not happened, or treat the premature announcement as a reason to step back? What response protects the ability to say no without turning the entire department into part of the negotiation?