{"version":"1.0","generated_at":"2026-10-05T18:42:44.677000","id":322,"slug":"langchain-core-1-4-0a2","title":"版本更新：langchain-ai/langchain 1.4.0a2，评估 LLM Agent 表现","summary":"LangChain发布1.4.0a2预发布版本，引入stream_events v3协议，优化流式输出和工具调用性能，为评估Agent表现提供基础设施。","abstract":"版本更新：langchain-ai/langchain 1.4.0a2，评估 LLM Agent 表现 LangChain发布1.4.0a2预发布版本，引入stream_events v3协议，优化流式输出和工具调用性能，为评估Agent表现提供基础设施。 LangChain发布1.4.0a2，引入stream_events v3协议 优化流式输出和工具调用性能 多项安全修复和依赖更新 为评估Agent表现提供新基础设施 预发布版本，需谨慎测试后使用 发布(core): 1.4.0a2 (#37134) 重构(core): 解开用于astream_events的_AsyncEventsResult混合 (#37133) 发布(core): 1.4.0a1 (#37132) 合并远程分支 'origin/master' 到 v1.4 特性(core): stream_events(version='v3')协议 (#37111) 修复(core): 在追踪器中保留工具运行的结构化输入 (#37108) 发布(perplexity): 1.2.0 (#37091) 杂项(docs): 更新x句柄引用 (#37081) 修复(core): 在warn_deprecated中使删除可选 (#37056) 修复(core): 验证_batch和_abatch中的batch_size以防止无限循环 (#36663) 杂项(core): 将stream_v2/astream_v2标记为beta (#36992) 发布(core): 1.3.2 (#36990) 特性(core): 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