Update graph_builder.py

graph_builder.py

@@ -1,29 +1,39 @@
 from langgraph.graph import StateGraph
+from langchain_community.tools import TavilySearchResults
 from llm_node import llm_node
 from formatter_node import formatter_node
 
 def build_graph():
     graph = StateGraph(dict)
 
-    def llm_step(state):
+    search_tool = TavilySearchResults()
+
+    def search_step(state):
         question = state.get("question")
         if not question:
-            raise ValueError("Missing 'question' in state")
-        llm_output = llm_node(question)  # ✅ uses HuggingFaceHub now
-        state["llm_output"] = llm_output
+            raise ValueError("Missing 'question'")
+        result = search_tool.run(question)
+        state["search_result"] = result
+        return state
+
+    def llm_step(state):
+        question = state.get("question")
+        search_result = state.get("search_result", "")
+        answer = llm_node(question, search_result)
+        state["llm_output"] = answer
         return state
 
     def formatter_step(state):
-        llm_output = state.get("llm_output")
-        if not llm_output:
-            raise ValueError("Missing 'llm_output' in state")
-        final_answer = formatter_node(llm_output)
+        final_answer = formatter_node(state["llm_output"])
         state["final_answer"] = final_answer
         return state
 
+    graph.add_node("search", search_step)
     graph.add_node("llm", llm_step)
     graph.add_node("formatter", formatter_step)
-    graph.set_entry_point("llm")
+
+    graph.set_entry_point("search")
+    graph.add_edge("search", "llm")
     graph.add_edge("llm", "formatter")
     graph.set_finish_point("formatter")