diff --git a/langflow/backend/signature.py b/langflow/backend/signature.py
index 9d32a837a..768afa20d 100644
--- a/langflow/backend/signature.py
+++ b/langflow/backend/signature.py
@@ -1,3 +1,4 @@
+from typing import Any, Dict
 from fastapi import APIRouter, HTTPException
 from langchain import agents, chains, llms, prompts
 from langchain.agents.load_tools import (
@@ -131,11 +132,13 @@ def get_tool(name: str):
     elif tool_type in _EXTRA_OPTIONAL_TOOLS:
         _, extra_keys = _EXTRA_OPTIONAL_TOOLS[tool_type]
         params = extra_keys
+    else:
+        params = []
 
     template = {
         param: (type_dict[param] if param == "llm" else type_dict["str"])
         for param in params
-    }
+    }  # type: Dict[str, Any]
     template["_type"] = tool_type
 
     return {
diff --git a/langflow/backend/util.py b/langflow/backend/util.py
index 2474bf322..9861f5bc2 100644
--- a/langflow/backend/util.py
+++ b/langflow/backend/util.py
@@ -113,8 +113,8 @@ def get_default_factory(module: str, function: str):
     pattern = r"<function (\w+)>"
 
     if match := re.search(pattern, function):
-        module = importlib.import_module(module)
-        return getattr(module, match[1])()
+        imported_module = importlib.import_module(module)
+        return getattr(imported_module, match[1])()
     return None