A little studied, inconspicuous species, the biology of the ash-breasted tit tyrant is poorly understood (4). Observed foraging in both small family groups and alone, this tiny bird gleans insects from the outer branches of shrubs and small trees. It may also alight upon an exposed perch, and make repeated forays to catch insects out of the air, and will occasionally drop to the ground or climb tree trunks to catch prey (4) (5).
Most tyrant flycatchers are monogamous, and remain with their partner year round, often fiercely defending permanent territories. Vocalisations of weak whistles and warbled notes, most often at dawn, are used to maintain territories, while males also use calls in courtship displays (5). Breeding in the ash-breasted tit-tyrant appears to take place late in the dry season with the female constructing a small, compact, cup-shaped nest in a bush (4). The female will then incubate the clutch of eggs, whilst the male defends the territory and nest site (5).