Agroecology not only requires changes in practice but also for the redesign of agricultural extension and innovation pathways. Farmer’s experience and innovative farming groups are placed at the foreground to produce inspiring evidence. Identifying or developing innovative practices experienced by farmers, capitalizing on this experience, and promoting the deployment of these innovations by relying on farmer groups is a strategy currently being implemented in France to develop agroecology. For extension and advisory services, basing advice to farmers on situated evidence entail challenging tasks in examining and evaluating evidence. In this paper, we examine how EAS implement this new approach through an analysis of the changes in the professional activities, postures, and skills of advisors/facilitators. To address these questions, a generative experiment started officially in October 2022 in a dialogical way between a pragmatic inquiry and NG’s professional activity. An action-research project was designed based on what was asked to NG by its employer, i.e. to capitalize practice-based evidence to support evidence-based practices. We argue that capitalizing on-farm innovations is a new encompassing narrative leading to professional uncertainty. It seems to be a way for advisors/facilitators and their institutions to be accountable. Finally, the implementation of horizontal learning challenges advisors/facilitators professionalism through the need to better combine technical expertise with facilitation skills.