Fix IO error

agent.py

@@ -1,4 +1,3 @@
-import os
 from typing import TypedDict, Annotated
 
 from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint, HuggingFaceEmbeddings
@@ -13,7 +12,7 @@ from tools import multiply, divide, add, substract
 
 available_tools = [multiply, divide, add, substract, DuckDuckGoSearchRun(output_format="list", max_results=5)]
 
-with os.read("system_prompt.txt", "r") as file:
+with open("system_prompt.txt", "r") as file:
     sys_prompt = SystemMessage(content=file.read())
 
 class AgentState(TypedDict):