We introduce InvestigationWorlds, an agentic environment for legal investigation.
We build on an underused artifact of U.S. civil litigation: the summary judgment motion.
This motion relies upon a record composed of real evidence exhibits, and results in a court-adopted hypothesis that is treated as ground truth for the purposes of deciding the motion.
Environment Construction
Each environment is built from a real U.S. Federal Court case retrieved from Public Access to Court Electronic Records (PACER) and augmented by an attorney-validated generation pipeline that synthesizes role-tagged documents around the original record.
Corpus Characteristics
The resulting corpus admits multiple coherent factual readings, only one of which matches the court-adopted hypothesis.
Evaluation
Evaluating on 100 cases, we find agents often commit to incorrect hypotheses despite retrieving relevant evidence, struggling to distinguish the court-adopted hypothesis from alternative hypotheses.