Upload agent.py

agent.py

@@ -180,12 +180,17 @@ def build_graph(provider: str = "groq"):
         return {"messages": [llm_with_tools.invoke(state["messages"])]}
     
     def retriever(state: MessagesState):
-        """Retriever node"""
-        similar_question = vector_store.similarity_search(state["messages"][0].content)
+    """Retriever node"""
+    similar_question = vector_store.similarity_search(state["messages"][0].content)
+    
+    if similar_question:
         example_msg = HumanMessage(
             content=f"Here I provide a similar question and answer for reference: \n\n{similar_question[0].page_content}",
         )
         return {"messages": [sys_msg] + state["messages"] + [example_msg]}
+    else:
+        return {"messages": [sys_msg] + state["messages"]}
+
 
     builder = StateGraph(MessagesState)
     builder.add_node("retriever", retriever)