# Harness-1：面向搜索智能体的强化学习与状态外部化框架

- 来源：HuggingFace Daily Papers（社区热门论文）
- 发布时间：2026-06-01 08:00
- AIHOT 分数：61
- AIHOT 链接：https://aihot.virxact.com/items/cmpwv6g5q010qsl79vmtg5wg4
- 原文链接：https://arxiv.org/abs/2606.02373

## AI 摘要

Harness-1是一个20B参数的检索子智能体，通过强化学习训练。其核心创新是将状态管理外部化至环境侧的框架中，该框架负责维护包括候选池、重要性标注的精选集、证据链与验证记录等工作记忆，使策略本身专注于搜索语义决策。在八个涵盖网页、金融、专利等领域的检索基准测试中，Harness-1取得了0.730的平均精选召回率，超越了次优的开源搜索子智能体11.4个点，并与规模更大的前沿模型保持竞争力。其代码已开源。

## 正文

Search agents are often trained as policies over growing transcripts: the model must decide how to search while also remembering what it has seen, which evidence is useful, which constraints remain open, and which claims have actually been checked. We argue that this formulation puts too much routine state management inside the policy: reinforcement learning is forced to optimize both semantic search decisions and recoverable bookkeeping that the environment can maintain more reliably. We introduce Harness-1, a 20B search agent (retrieval subagent) trained with reinforcement learning inside a stateful search harness. The harness maintains environment-side working memory, including a candidate pool, an importance-tagged curated set, compact evidence links, verification records, compressed and deduplicated observations, and budget-aware context rendering. The policy retains the semantic decisions: what to search, which documents to keep or discard, what to verify, and when to stop. Across eight retrieval benchmarks spanning web, finance, patents, and multi-hop QA, Harness-1 achieves 0.730 average curated recall, outperforming the next strongest open search subagent by +11.4 points and remaining competitive with much larger frontier-model searchers. Its gains are especially strong on held-out transfer benchmarks, suggesting that reinforcement learning over explicit search state can produce retrieval behaviors that generalize beyond the training domains. Our code is available at https://github.com/pat-jj/harness-1.