The current study investigates the perceptions of four student teachers of implementing AI tools for designing ELT lessons into their microteaching sessions. The professional development of student teachers achieved via adapting AI tools has not been widely investigated, since the majority of available studies focus on the students’ learning of language skills with AI tools. This study follows the appreciative inquiry approach that emphasises positive teaching practices, aiming to foster sustainable professional development. The participants of the study were MA student teachers studying the Advanced Teaching Practicum course at a Saudi university over one academic semester. Their experiences of designing ELT lessons for their microteaching sessions were reflected upon in reflective journals and a BlackBoard forum. The qualitative analyses of the journals, the forum and lesson plans revealed that the participants appreciated using AI tools, despite the few challenges that occurred. This study demonstrates the participants’ independent efforts that led them to use AI tools that have not been addressed by ELT researchers. The authors hope that this study will enrich ELT practices, assist AI designers in developing their designs by understanding teachers’ experiences and contribute to a sustainable educational future.