  Tribrid inflation is a variant of supersymmetric hybrid inflation in which
the inflaton is a matter field (which can be charged under gauge symmetries)
and inflation ends by a GUT-scale phase transition of a waterfall field. These
features make tribrid inflation a promising framework for realising inflation
with particularly close connections to particle physics. Superpotentials of
tribrid inflation involve effective operators suppressed by some cutoff scale,
which is often taken as the Planck scale. However, these operators may also be
generated by integrating out messenger superfields with masses below the Planck
scale, which is in fact quite common in GUT and/or flavour models. The values
of the inflaton field during inflation can then lie above this mass scale,
which means that for reliably calculating the model predictions one has to go
beyond the effective theory description. We therefore discuss realisations of
effective theories of tribrid inflation and specify in which cases effects from
the messenger fields are expected, and under which conditions they can safely
be neglected. In particular, we point out how to construct realisations where,
despite the fact that the inflaton field values are above the messenger mass
scale, the predictions for the observables are (to a good approximation)
identical to the ones calculated in the effective theory treatment where the
messenger mass scale is identified with the (apparent) cutoff scale.
