  We show that $3$-graphs on $n$ vertices whose codegree is at least $(2/3 +
o(1))n$ can be decomposed into tight cycles and admit Euler tours, subject to
the trivial necessary divisibility conditions. We also provide a construction
showing that our bounds are best possible up to the $o(1)$ term. All together,
our results answer in the negative some recent questions of Glock, Joos,
K\"uhn, and Osthus.
