Feature updates or community-made modifications for the game's characters and UI.
While "AG" is often shorthand for the game's title, the specific contents of this file (indicated by the .7z extension) are not officially documented as a standard feature. In gaming communities, such files often represent: A.G.031.7z
If you are looking for a specific linked to this file, it may be a community-developed tool or a "patch" for a specific client version. a popular mobile gacha game.
It is highly likely that refers to a compressed archive file related to Artery Gear: Fusion , a popular mobile gacha game. A.G.031.7z