Update app.py

app.py

@@ -6,7 +6,7 @@ from langgraph.prebuilt import create_react_agent
 from mcp import ClientSession, StdioServerParameters
 from mcp.client.stdio import stdio_client
 from langchain_mcp_adapters.tools import load_mcp_tools
-from langchain_core.messages import HumanMessage
+from langchain_core.messages import HumanMessage, SystemMessage
 
 # --- Configuration ---
 NEBIUS_API_KEY = os.getenv("NEBIUS_API_KEY") 
@@ -86,11 +86,18 @@ async def run_tutor_dashboard(user_message):
                 temperature=0.7
             )
 
-            # FIXED: Changed 'state_modifier' to 'messages_modifier' to match LangGraph API
-            agent_executor = create_react_agent(llm, tools, messages_modifier=SYSTEM_PROMPT)
+            # FIXED: Removed 'messages_modifier' to avoid TypeError. 
+            # We now pass the System Prompt manually in the inputs.
+            agent_executor = create_react_agent(llm, tools)
             
             # Run Agent
-            inputs = {"messages": [HumanMessage(content=user_message)]}
+            # We prepend the SystemMessage to ensure the agent follows instructions
+            inputs = {
+                "messages": [
+                    SystemMessage(content=SYSTEM_PROMPT),
+                    HumanMessage(content=user_message)
+                ]
+            }
             response = await agent_executor.ainvoke(inputs)
             final_text = response["messages"][-1].content