Many studies show that livestock within a circular agri-food systems framework can contribute to promote sustainability transitions in the context of developed countries. However, there is a lack of studies in rural areas of developing countries. CLiMiT project aims to develop an approach to facilitate the codesign and the implementation of livestock-based circular agri-food systems to promote sustainable territories in developing countries. Based on a Living Lab approach we first propose an interdisciplinary and participative agri-food systems territorial diagnosis starting from a biomass perspective. The biomass flows at farm and territory level and their governance are assessed through individual interviews and participatory workshops. Second, supported by multicriteria assessment methodologies (socio-economic and environmental), livestock-based circular agri-food system and the pathways to implement the transitions are co-designed with local stakeholders. Finally, via local NGO, we facilitate the implementation of the co-designed system and follow up in itinere the first obstacles for its operationalisation. The first phase of the project is set in two rural pilot areas located in Malagasy Central Highlands. The knowledge and tools mobilized will contribute to develop the CLiMiT approach that will be tested and improved in other developing countries during the second phase of the project.