I carry
1 Tubeless repair worms
2 Spare tube/s
3 Puncture repair kit for spare tube, and
4 spare valve core and removal tool.
This ensures I never get punctures. I did once snap a valve stem off entirely so I’m gong to check I have one in the spares pouch.
/edit
5 spare tubeless stem present and correct.
TBH that feels like too much ‘stuff‘ unless you’re off on a big expedition. But also this:
I don’t think I’d ever manage to get any kind of tyre seated tubeless with a mini pump, so not convinced by the value of a spare valve.
Reseating a tubeless tyre after you’ve had to replace a valve, by a trail, even with CO2(?) I’d give it a 25% chance at best, and the faff time is now off the bloody charts if you can’t…
Dyna plugs/anchovies for most common tyre cuts/holes, if that doesn’t work, fit a tube.
If the valve fails for whatever reason, fit a tube.
So carry plugs, a pump and a tube (maybe 2?) and that covers most “fault on fault scenarios” and should get you back to civilization, beyond that you are having a really shite day IMO.