LangChain 1.4.0a4 发布：重构 MCP 适配器并增强中间件

AI 摘要

LangChain 发布了 1.4.0a4 预发布版本，主要围绕 MCP（Model Context Protocol）适配器进行重构和功能增强，包括支持 ClientGroup 作为目标、简化 MCPAdapter 构造、引入 LangGraph 中断机制处理 MCP 请求等。同时修复了多个中间件问题，并增加了对标准模型异常类型和 LangSmith 提供商的支持。

正文节选

Initial release release(langchain): 1.4.0a4 test(langchain): cover mixed-era ClientGroup and group elicitation Update libs/langchain_v1/langchain/mcp/adapter.py fix(langchain): drive MCP elicitation via member session for fastmcp 4.0.1 fix(sdk): use latest fastmcp and rm reentrant impl cr cr refactor(langchain): inline MCP client arming into `__init__` refactor(langchain): stamp an arm marker instead of introspecting the handler closure fix(langchain): gate MCP interrupt routing on the negotiat

发布时间：2026-09-02 13:35

抓取时间：2026-09-02 13:43

来源机构：LangChain