Improving Petri scheming audits with environment blueprints

This is a short write-up of work conducted as part of the MATS 9.0 program. Thanks to Victoria Krakovna for mentorship and Fred Bruford for research management.TL;DR: We introduce a pipeline that generates environment blueprints for realistic scheming propensity evaluations. As a case study, we test how well these blueprints power investigator agents — specifically Petri — in auditing Gemini 3.1 Pro Preview for code sabotage. Compared to the baseline Petri, Blueprint-Petri results in audits that...