I have a very small toolkit, couldn't tell you what's in it, but I can tell you how I decided what went in it.

I have a white board in the garage, dead cheap pound shop thing....
On it, I kept a list of the tools I used on the bike whether it was changing a tyre, or adjusting the mirrors, every time I used a tool I wrote it down. Eventually there was a very small list of stuff I need. For the Tenere it's (approx) 3 allen keys, couple of sockets, adjustable spanner screwdrivers, pliers, tyre levers etc. Then I set about seeing what I could adjust/re-fabricate/cut down to get two tools in one;

Such as the small 'hammer', it's actually the same bar I use on the sockets !

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Never underestimate the power of stupid people in large groups.