From 2d038b57b295133ea328278fca3a4f89c155223a Mon Sep 17 00:00:00 2001
From: Harrison Chase <hw.chase.17@gmail.com>
Date: Sun, 11 Jun 2023 09:48:09 -0700
Subject: [PATCH] Harrison/arxiv fix (#5993)

Co-authored-by: Juanjo do Olmo <87780148+SimplyJuanjo@users.noreply.github.com>
---
 langchain/tools/arxiv/tool.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/langchain/tools/arxiv/tool.py b/langchain/tools/arxiv/tool.py
index 76513e27..a9144dd8 100644
--- a/langchain/tools/arxiv/tool.py
+++ b/langchain/tools/arxiv/tool.py
@@ -2,6 +2,8 @@
 
 from typing import Optional
 
+from pydantic import Field
+
 from langchain.callbacks.manager import (
     AsyncCallbackManagerForToolRun,
     CallbackManagerForToolRun,
@@ -22,7 +24,7 @@ class ArxivQueryRun(BaseTool):
         "from scientific articles on arxiv.org. "
         "Input should be a search query."
     )
-    api_wrapper: ArxivAPIWrapper
+    api_wrapper: ArxivAPIWrapper = Field(default_factory=ArxivAPIWrapper)
 
     def _run(
         self,