Here’s a link to Donald Tusk’s letter to members of the European Council, headed:
At the foot of the letter is a series of items under the heading: Elements of the Proposal.
The first one is the draft decision of the Heads of State or Government, meeting within the European Council, concerning a new settlement for the United Kingdom within the European Union.
That’s the key document, and we link to it and to Tusk’s letter so that our readers can examine both for themselves.