As computer vision moves into real-world use, robust localization across diverse devices is crucial. The CroCoDL workshop unites experts in vision, robotics, and AR to tackle cross-device, multi-agent localization. Focusing on 3D vision, visual localization, embodied AI, and AR/VR/MR, it bridges academic research and real-world deployment. The inaugural event features invited talks, papers, and a competition. It also introduces CroCoDL, a new large-scale benchmark with synchronized data from phones, headsets, and robots. By connecting efforts in structure-from-motion, neural rendering, and embodied AI, the workshop advances scalable localization across domains, sensors, and dynamic environments.