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arXiv · 2606.18728

LegalWorld: A Life-Cycle Interactive Environment for Legal Agents

Songhan Zuo·Shengbin Yue·Tao Chiang·Guanying Li·Yun Song·Xuanjing Huang·Zhongyu Wei
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Abstract

Civil litigation is inherently a life-cycle process: what a lawyer drafts on day one constrains what unfolds at trial months later. Yet existing legal benchmarks evaluate isolated subtasks, and prior legal-agent simulators reinitialize each scenario from shared ground truth, leaving cross-stage causal dependencies unmodeled. We present LegalWorld, a life-cycle interactive environment that models Chinese civil litigation as a causally connected state chain of five stages (seven sub-scenarios), grounded in 75,309 paired Chinese civil judgments. We pair it with reusable infrastructure (local memory, global case memory, a Skill/Tool library) that keeps each dispute consistent across its full life cycle. Building on this environment, we construct LongJud-Bench to evaluate agent capability across all five connected stages. 18,992 ratings from 217 legal-background evaluators confirm that LegalWorld trajectories are procedurally faithful and role-consistent; and a capability-level cross-model evaluation reveals sharp divergences that aggregate scores cannot expose, with no single backbone leading across consultation, drafting, and courtroom advocacy. Detailed resources will be released publicly.

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Songhan Zuo, Shengbin Yue, Tao Chiang, Guanying Li, Yun Song, Xuanjing Huang, Zhongyu Wei. 2026-06-17. LegalWorld: A Life-Cycle Interactive Environment for Legal Agents. https://arxiv.org/abs/2606.18728

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