[langchain-deepseek] Missing `reasoning_content` in request payload when using deepseek-reasoner with tool calling
![[langchain-deepseek] Missing `reasoning_content` in request payload when using deepseek-reasoner with tool calling](https://www.chat-gpts.plus/wp-content/uploads/2026/08/34166-e1df8dd1-768x403.jpg)
该报错发生在使用 deepseek-reasoner 模型并开启工具调用(tool calling)时,多轮对话的第二轮请求会因缺少 reasoning_content 字段而返回 400 错误。优先排查你使用的 langchain-deepseek 版本是否已包含修复此问题的补丁。








