  If time-dependent disruptions from slow-roll occur during inflation, the
correlation functions of the primordial curvature perturbation should have
scale-dependent features, a case which is marginally supported from the cosmic
microwave background (CMB) data. We offer a new approach to analyze the
appearance of such features in the primordial bispectrum that yields new
consistency relations and justifies the search of oscillating patterns
modulated by orthogonal and local templates. Under the assumption of sharp
features, we find that the cubic couplings of the curvature perturbation can be
expressed in terms of the bispectrum in two specific momentum configurations,
for example local and equilateral. This allows us to derive consistency
relations among different bispectrum shapes, which in principle could be tested
in future CMB surveys. Furthermore, based on the form of the consistency
relations, we construct new two-parameter templates for features that include
all the known shapes.
