[bjoerns]

It's an interesting idea (though I'm not sure how much appetite there is out there).

We've built a version-control app on top of Git for workbook files (www.xltrail.com) so I know a thing or two about parsing the cell content of sheets.

There is no Python library that supports reading cell formula content across all workbook files (for instance, xlrd does not support formulae at all).

If you can go beyond Python, have a look at sheetjs.com (open-source JavaScript based) or Aspose (commercial .NET solution).

That aside, "client" integration of such a tool could be a major blocker from our own experience. E.g. if you could build it in such a way that it's "fire and forget" (like uploading it to SharePoint and integrate it there) it is a lot more likely to being used. Or integrate it via Git (drop me a message if you want to chat). Or add it as a feature to something like rubberduckvba.