diff --git a/libs/core/langchain_core/tools/base.py b/libs/core/langchain_core/tools/base.py
index ff264edac32..cf755284614 100644
--- a/libs/core/langchain_core/tools/base.py
+++ b/libs/core/langchain_core/tools/base.py
@@ -605,6 +605,9 @@ class ChildTool(BaseTool):
     def _to_args_and_kwargs(
         self, tool_input: Union[str, dict], tool_call_id: Optional[str]
     ) -> tuple[tuple, dict]:
+        if self.args_schema is not None and not get_fields(self.args_schema):
+            # StructuredTool with no args
+            return (), {}
         tool_input = self._parse_input(tool_input, tool_call_id)
         # For backwards compatibility, if run_input is a string,
         # pass as a positional argument.
diff --git a/libs/core/tests/unit_tests/test_tools.py b/libs/core/tests/unit_tests/test_tools.py
index b331abea7da..b21fc139a21 100644
--- a/libs/core/tests/unit_tests/test_tools.py
+++ b/libs/core/tests/unit_tests/test_tools.py
@@ -575,6 +575,19 @@ def test_structured_tool_from_function_with_run_manager() -> None:
     )
 
 
+def test_structured_tool_from_parameterless_function() -> None:
+    """Test parameterless function of structured tool."""
+
+    def foo() -> str:
+        """Docstring."""
+        return "invoke foo"
+
+    structured_tool = StructuredTool.from_function(foo)
+
+    assert structured_tool.run({}) == "invoke foo"
+    assert structured_tool.run("") == "invoke foo"
+
+
 def test_named_tool_decorator() -> None:
     """Test functionality when arguments are provided as input to decorator."""