openrefine seems to use versioned tags - that's something I could see us doing.
Also the question of adding the source client was quickly discussed in story writing.

TODO: verify how much there is left to do once T226999: Save Wikidata edit when submitting client edit modal is completed...

In T227003#5444836, @Pablo-WMDE wrote:

TODO: verify how much there is left to do once T226999: Save Wikidata edit when submitting client edit modal is completed...

As of T230336, ForeignApiWritingRepository supports a tags parameter, but it’s not initialized in createServices:

services.setWritingEntityRepository( new ForeignApiWritingRepository(
	new mwWindow.mw.ForeignApi(
		`${repoConfig.url}${repoConfig.scriptPath}/api.php`,
	),
	mwWindow.mw.config.get( 'wgUserName' ),
	// TODO tags from some config
) );

So as I see it, the following things are left to do:

• create a (server-side) config setting in Wikibase Client for the tag(s)
• embed that config variable in the browser-side code
• use it (browser-side) to initialize the WritingEntityRepository
• configure it in beta / production

Agreed, thanks! We can copy these to become (sub)tasks of the story once it is picked.
We might want to revise the existing estimation a bit, I think.

This should be working now on Beta, as far as I can tell, but I don’t think it can be tested until T230329: Use header component & save button is done.