I'm not sure diffs are going to be useful here.  For example, this diff ostensibly introduces an error in the math markup, but due to the way I've formatted the wikisource, it's not obvious from the diff that this is within <math>...</math> tags.

You might end up having to do this using the database dumps, which is going to entail looking at a lot more data (extreme understatement) than the recent changes stream.

On Jul 1, 2021, at 9:18 AM, Robin Hood <RobinHood70@LIVE.CA> wrote:

I’m no expert, but I believe the only way to get a diff via the API is throughhttps://www.mediawiki.org/wiki/API:Compare. I haven’t worked with it to any great degree, though, so I’m afraid I can’t help beyond pointing you in that direction.
 
From: Physikerwelt <wiki@physikerwelt.de> 
Sent: July 1, 2021 8:17 AM
To: Wikimedia developers <wikitech-l@lists.wikimedia.org>
Cc: andre.greiner-petter <andre.greiner-petter@zbmath.org>; Aaron Halfaker <ahalfaker@wikimedia.org>
Subject: [Wikitech-l] Stream of recent changes diffs
 
Dear all,
 
we have developed a tool that is (in some cases) capable of checking if formulae in <math/>-tags in the context of a wikitext fragment are likely to be correct or not. We would like to test the tool on the recent changes. From
 
 
we can get the stream of recent changes. However, I did not find a way to get the diff (either in HTML or Wikitext) to figure out how the content was changed. The only option I see is to request the revision text manually additionally. This would be a few unnecessary requests since most of the changes do not change <math/>-tags. I assume that others, i.e., ORES
 
 
compute the diffs anyhow and wonder if there is an easier way to get the diffs from the recent changes stream without additional requests.
 
All the best
Physikerwelt (Moritz Schubotz)
 
 
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