Older racing rules were that the tyre valve had to have a metal valve cap ... that would keep the air in if the valve failed. The better valve caps have an extension that is a tool for valve core removal.
On my bikes I use these metal valve caps with the built in tool. I have had many flats, some valve failures. As the tubes I carry have new valves I don't see much point in carrying a tool for there repair, I just replace the tube and valve. The new tubes come with the decorative plastic caps ... get the metal ones - they keep out much more dirt, and much more air in it Murphy strikes.
I have never had a tyre case fail, but I have come close - the side wall was cut for some 5 cm and you could see the tyre case threads. That was the worst I have had - from limestone rocks poking up through the ground for many days of riding. I have had nails, wooden stakes, and the usual mysteries that were left behind to ruin someone else's day. There are patches for the tyre cases - rather large and heavy compared to a tube patch.
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