构建中国民事诉讼全周期交互环境，模拟律师行为的长期因果影响。
LegalWorld: A Life-Cycle Interactive Environment for Legal Agents
- 将民事诉讼建模为五个阶段的因果状态链，保持全程一致性。
- 基于7.5万份判决数据，验证轨迹程序合规且角色一致。
- 揭示单一模型无法在咨询、起草、庭审中全面领先，适合评估法律智能体综合能力。
民事诉讼本质上是一个生命周期过程：律师首日的文书工作会限制数月后庭审的展开。然而现有法律评测基准仅评估孤立子任务，以往的法律代理仿真器每次重置场景时依赖共享真实情况，未建模跨阶段因果依赖。我们提出LegalWorld，一个以中国民事诉讼为蓝本的生命周期交互环境，将其建模为五个阶段（七个子场景）的因果状态链，基于75,309对中文民事判决。配套可复用基础设施（本地记忆、全局案件记忆、技能/工具库）确保每桩纠纷在完整生命周期中保持一致。在此基础上，我们构建LongJud-Bench，评估代理在所有五个连接阶段的能力。217名具有法律背景的评估者给出18,992条评分，证实LegalWorld轨迹在程序上忠实且角色一致；跨模型能力评估显示显著差异，聚合分数无法揭示这些差异，无单一主干模型能在咨询、起草与法庭辩护中全面领先。详细资源将公开发布。
原文摘要 · Abstract (English)
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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