Extension documentation on mediawiki.org tends to be incomplete and/or outdated. Tool-extjsonuploader makes it possible to maintain some of the information automatically; the aim of the hacking project is to improve the scope and integration of the data collected by it, and think about the future of its architecture (e.g. what would it take to use MCR? what would it take to build a poor man's extension store (T118188) on top of it?).