Probable transcription factor involved in the regulation of fruit growth. Contributes to integument development. Controls organ size via cell expansion (PubMed:20088901). Involved in the regulation of longitudinal growth of the fruit evenly throughout the radial axis (PubMed:20598091). Functions redundantly with TT16/AGL32 to repress nucellus growth and promote its degeneration (PubMed:27233529). Forms homodimer (PubMed:20598091). Interacts with AGL16 (PubMed:20598091). Expressed in bud pedicels, petals, anthers, style, ovary, seeds and embryos. Plants over-expressing AGL63 are dwarf, have few rosette leaves with a curly-leaf phenotype, and display small disorganized floral structures and addition of carpel-like, resulting in small abnormal siliques with few seed production.