style: 🐛 mypy correction

src/backend/langflow/utils/util.py

@@ -183,7 +183,7 @@ def get_tool_by_name(name: str):
     return tools[name]
 
 
-def get_tool_params(tool, **kwargs):
+def get_tool_params(tool, **kwargs) -> Dict | None:
     # Parse the function code into an abstract syntax tree
     # Define if it is a function or a class
     if inspect.isfunction(tool):
@@ -192,9 +192,11 @@ def get_tool_params(tool, **kwargs):
         # Get the parameters necessary to
         # instantiate the class
         return get_class_tool_params(tool, **kwargs)
+    else:
+        raise ValueError("Tool must be a function or class.")
 
 
-def get_func_tool_params(func, **kwargs):
+def get_func_tool_params(func, **kwargs) -> Dict | None:
     tree = ast.parse(inspect.getsource(func))
 
     # Iterate over the statements in the abstract syntax tree
@@ -237,7 +239,7 @@ def get_func_tool_params(func, **kwargs):
     return None
 
 
-def get_class_tool_params(cls, **kwargs):
+def get_class_tool_params(cls, **kwargs) -> Dict | None:
     tree = ast.parse(inspect.getsource(cls))
 
     tool_params = {}
@@ -259,12 +261,14 @@ def get_class_tool_params(cls, **kwargs):
                         # If there is not default value, set it to an empty string
                         else:
                             try:
-                                tool_params[arg.arg] = ast.literal_eval(arg.annotation)
+                                annotation = ast.literal_eval(arg.annotation)  # type: ignore
+                                tool_params[arg.arg] = annotation
                             except ValueError:
                                 tool_params[arg.arg] = ""
-                elif not cls == Tool and isinstance(stmt, ast.AnnAssign):
+                # Get the attribute name and the annotation
+                elif cls != Tool and isinstance(stmt, ast.AnnAssign):
                     # Get the attribute name and the annotation
-                    tool_params[stmt.target.id] = ""
+                    tool_params[stmt.target.id] = ""  # type: ignore
 
     return tool_params