When bike touring I always carry the bare minimum of tools I need to affect most of the conceivable bike repair issues which might arise. The most likely things that will need to be dealt with are flat tires, replacing or adjusting brake pads, shifter/derailleur adjustments and tightening loose bolts. Less likely but possible are things like broken chains or spokes.
Simple Bike Maintenance
Tools To Carry on a Bike Tour
Bike Maintenance in Between Tours
Other Maintenance Tips
The next three posts deal with replacing broken spokes:
Carry Spare Spokes
Compact Cassette Lockring Tool