Open Agent Specification: Enabling Cross-Framework Comparison of AI Agents. - Soufiane Amini; Yassine Benajiba; Cesare Bernardis; Paul Cayet; Hassan Chafi; Abderrahim Fathan; Louis Faucon; Damien Hilloulin; Sungpack Hong; Ingo Kossyk; Tirthankar Lahiri; Tran Minh Son Le; et al. (CAIS, 2026)