  The clear separation of scales observed in halo nuclei between the extended
halo and the compact core makes these exotic nuclei a perfect subject for
Effective Field Theory (EFT). Such description leads to a systematic expansion
of the core-halo Hamiltonian, which naturally orders the nuclear-structure
observables. In this short review, I show the advantage there is to include
Halo-EFT descriptions within precise models of reactions. It helps identifying
the nuclear-structure observables that matter in the description of the
reactions, and enables us to easily bridge predictions of nuclear-structure
calculations to reaction observables. I illustrate this on breakup, transfer
and knockout reactions with 11Be, the archetypical one-neutron halo nucleus.
