Update agent.py

agent.py

@@ -1104,7 +1104,12 @@ def build_graph(vector_store, provider: str, model_config: dict) -> StateGraph:
     global tool_map
     tool_map = {t.name: t for t in tools}
 
-    llm_with_tools = llm.bind_tools(tools)
+    if hasattr(llm, "bind_tools"):
+        llm_with_tools = llm.bind_tools(tools)
+    else:
+        llm_with_tools = llm  # fallback: no tool binding
+
+    
     sys_msg = SystemMessage(content="You are a helpful assistant.")
 
     retriever = RunnableLambda(lambda state: {