diff --git a/nanobot/agent/tools/exec_session.py b/nanobot/agent/tools/exec_session.py
index f67f35bb..d9db38c8 100644
--- a/nanobot/agent/tools/exec_session.py
+++ b/nanobot/agent/tools/exec_session.py
@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import asyncio
-import os
 import time
 import uuid
 from contextlib import suppress