From 5d60ced7b39733afc43e2aa2b72279082ac996c0 Mon Sep 17 00:00:00 2001
From: Bagatur <22008038+baskaryan@users.noreply.github.com>
Date: Thu, 17 Aug 2023 12:33:20 -0700
Subject: [PATCH] pydantic compatibility guide fix (#9418)

---
 docs/extras/guides/pydantic_compatibility.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/docs/extras/guides/pydantic_compatibility.md b/docs/extras/guides/pydantic_compatibility.md
index a54c9fbfa9..15518c5e23 100644
--- a/docs/extras/guides/pydantic_compatibility.md
+++ b/docs/extras/guides/pydantic_compatibility.md
@@ -99,6 +99,20 @@ Tool.from_function( # <-- tool uses v1 namespace
 
 **NO**
 
+```python
+from langchain.tools.base import Tool
+from pydantic import BaseModel, Field # <-- Uses v2 namespace
+
+class CalculatorInput(BaseModel):
+    question: str = Field()
+
+Tool.from_function( # <-- tool uses v1 namespace
+    func=lambda question: 'hello',
+    name="Calculator",
+    description="useful for when you need to answer questions about math",
+    args_schema=CalculatorInput
+)
+```
 
 ## After 2023-08-25 release