diff --git a/agent/deep_assistant.py b/agent/deep_assistant.py
index b6983eb..cf0168c 100644
--- a/agent/deep_assistant.py
+++ b/agent/deep_assistant.py
@@ -18,7 +18,6 @@ from langgraph.store.base import BaseStore
 from langchain.agents.middleware import SummarizationMiddleware as LangchainSummarizationMiddleware
 from .summarization_middleware import SummarizationMiddleware
 from langchain_mcp_adapters.client import MultiServerMCPClient
-from sympy.printing.cxx import none
 from utils.fastapi_utils import detect_provider, sanitize_model_kwargs
 from .guideline_middleware import GuidelineMiddleware
 from .tool_output_length_middleware import ToolOutputLengthMiddleware