Secateurs, loppers, pruning saw and Wolf tool system with handles in varying lengths and heads for hoeing, cultivating and raking that fit all. Easy to store on a board with suitable pegs and screws for hanging them. Then I'd add a long handled spade and fork, preferably stainless steel, plus two trowels, an old dinner fork for pricking out and a set of watering cans, hose pipes and connectors plus assorted buckets for holding plants when I'm lifting and dividing and transplanting. Add a plank for standing on to work in the raised veggie beds, a kneeling pad for close working, a supply of canes and hazel sticks for supports and an old bread knife for cutting up clumps of perennials plus a lawn mower and cloches.
Quite a lot really.