On June 20-22, 2023, the first meeting of the ScenarioMIP project under the new phase of the Coupled Model Intercomparison Project, CMIP7, was held in Reading, UK. There were 78 meeting attendees in total, with 37 in person and 41 online. Participants were primarily members of scenario-related MIPs, including the ScenarioMIP Scientific Steering Committee, as well as relevant scientific experts identified by the MIPs, representatives of ESM modelling centres, and leadership of CMIP. After the conclusion of the meeting, the ScenarioMIP co-chairs Brian O'Neill, Claudia Tebaldi, and Detlef van Vuuren, and the Scientific Steering Committee have written a workshop report. This report summarises the key outcomes of the discussions during the event and outlines some of the next steps in developing the ScenarioMIP protocol and it's implementation.