Update app.py

app.py

@@ -10,7 +10,7 @@ from langgraph.graph.message import add_messages
 from langchain_hyperbrowser import HyperbrowserBrowserUseTool
 from langgraph.graph import START, StateGraph
 from langgraph.prebuilt import ToolNode, tools_condition
-from langchain_core.messages import HumanMessage
+from langchain_core.messages import HumanMessage, SystemMessage
 
 browser_tool = HyperbrowserBrowserUseTool()
 tools = [browser_tool]
@@ -23,7 +23,7 @@ class State(TypedDict):
     messages = Annotated[list[AnyMessage], add_messages]
 
 def assistant(state:State):
-    system_message = "You are a helpful assistant. Your job is to answer the questions asked of you as accurately as possible. You have access to a browser search tool, which you may use when needed to answer a question."
+    system_message = SystemMessage("You are a helpful assistant. Your job is to answer the questions asked of you as accurately as possible. You have access to a browser search tool, which you may use when needed to answer a question.")
     return {
         "messages": [llm_with_tools.invoke([system_message] + state["messages"])]
     }