It isn't clear from the description if this is intended or not, but to be really useful (for example to document with which client an operation is being performed) they need to be "per interaction" so not just for the original note creation but at least for every comment, and maybe for opening and closing too.

It isn't clear from the description if this is intended or not, but to be really useful (for example to document with which client an operation is being performed) they need to be "per interaction" so not just for the original note creation but at least for every comment, and maybe for opening and closing too.

At the moment, tags are added only at creation time and are per-note. For example, if created from OpenStreetMap, only pair (created_by, OpenStreetMaps-Website) will be created. If note is created from editor, editor defines number and tags which will be created.

But, it will not be hard to add tags for comments / actions (open, close, ..) .. We can add it without disrupting current implementation as next steps, if others agree.

Thanks for great idea!

but to be really useful they need to be "per interaction"

Do you want versioned notes with sets of tags for every version, like elements?

No, I don't think that would be an appropriate model.

Just as comments extend the conversation around the original note and do not replace it, tags associated with comments should not replace the original ones.

I thought about this again and versioned notes may be what we actually want. We already kind of have note versions, they only contain state changes (open -> closed -> open again). But with tags we might want to record tag changes too. Being able to change tags allows to use them for more than just recording what tool the note was created with. We may want to use them for some kind of categorization (like "needs survey"). We might want to add some categories to already existing notes. Also we might want to add them to our own newly created notes because the tools we were using to create these notes don't allow adding tags or it was inconvenient to add the tags at the moment.

tags associated with comments should not replace the original ones

We don't have tags associated with comments anywhere else on the site.

they need to be "per interaction" so not just for the original note creation but at least for every comment

And what's the goal of that? Is it that important to record a client if it was just a comment? We're not adding tags to changeset comments and not trying to record clients in some other way, should we start doing that?

and maybe for opening and closing too

This is different to commenting. If anyone actually modifies the note, we might want to record that by adding a tag such as edited_by or closed_by or maybe even by overwriting created_by. Although in the latter case maybe we shouldn't be using created_by for notes at all (#5344 currently does), and just use edited_by.