diff --git a/packages/toolbox-core/src/toolbox_core/sync_client.py b/packages/toolbox-core/src/toolbox_core/sync_client.py
index 77df8d8d..6bb54b45 100644
--- a/packages/toolbox-core/src/toolbox_core/sync_client.py
+++ b/packages/toolbox-core/src/toolbox_core/sync_client.py
@@ -15,13 +15,11 @@
 
 import asyncio
 from threading import Thread
-from typing import Any, Callable, Coroutine, Mapping, Optional, TypeVar, Union
+from typing import Any, Callable, Coroutine, Mapping, Optional, Union
 
 from .client import ToolboxClient
 from .sync_tool import ToolboxSyncTool
 
-T = TypeVar("T")
-
 
 class ToolboxSyncClient:
     """
diff --git a/packages/toolbox-core/src/toolbox_core/sync_tool.py b/packages/toolbox-core/src/toolbox_core/sync_tool.py
index 74f6f0bf..1b21d722 100644
--- a/packages/toolbox-core/src/toolbox_core/sync_tool.py
+++ b/packages/toolbox-core/src/toolbox_core/sync_tool.py
@@ -17,13 +17,11 @@
 from asyncio import AbstractEventLoop
 from inspect import Signature
 from threading import Thread
-from typing import Any, Callable, Coroutine, Mapping, Sequence, TypeVar, Union
+from typing import Any, Callable, Coroutine, Mapping, Sequence, Union
 
 from .protocol import ParameterSchema
 from .tool import ToolboxTool
 
-T = TypeVar("T")
-
 
 class ToolboxSyncTool:
     """