The agreement is an abomination. It reflects a policy of Donald Trump which was aimed primarily at giving him an advantage in the 2020 presidential election.
It pursues the wrong goal, and was negotiated by the wrong people. It is strongly opposed by the Afghan Government of Ashraf Ghani, leading experts, and many allies whose forces (primarily from the NATO countries, in addition to the U.K and Canada ) have fought and died alongside American and Afghan soldiers, all in pursuit of what the U.S. held out to be the goal of establishing a democratic state governed by law.
Now, the United States has joined with Russia in convening a conference in Moscow attended by Russia, China, Iran, Pakistan, and Turkey. Notoriously uninvited and absent were the Europeans and the NATO members who helped make up the International Security Assistance Force (ISAF) in Afghanistan from 2001-2014, and its follow-on successor, “Operation Resolute Support”, which in principle has been focused on training.
The reason the Europeans were not invited is blazingly clear: They would never go along with a settlement which sells out the democratic government of Afghanistan, established pursuant to elections in 2018 (legislative) and 2019 (presidential), and made up of the two leading presidential candidates in 2019 and their forces. Nor would the Europeans be likely to go along with a settlement that surrenders the future of Afghan women to the Taliban.