Fix invocation

libs/langchain/langchain/tools/base.py

@@ -771,8 +771,21 @@ def tool(
     def _make_with_name(tool_name: str) -> Callable:
         def _make_tool(dec_func: Union[Callable, Runnable]) -> BaseTool:
             if isinstance(dec_func, Runnable):
-                coroutine = dec_func.ainvoke
+                if dec_func.input_schema.schema().get("type") != "object":
-                func = dec_func.invoke
+                    raise ValueError("Runnable must have an object schema.")
+
+                async def ainvoke_wrapper(
+                    callbacks: Optional[Callbacks] = None, **kwargs: Any
+                ) -> Any:
+                    return await dec_func.ainvoke(kwargs, {"callbacks": callbacks})
+
+                def invoke_wrapper(
+                    callbacks: Optional[Callbacks] = None, **kwargs: Any
+                ) -> Any:
+                    return dec_func.invoke(kwargs, {"callbacks": callbacks})
+
+                coroutine = ainvoke_wrapper
+                func = invoke_wrapper
                 schema = dec_func.input_schema
                 description = repr(dec_func)
             elif inspect.iscoroutinefunction(dec_func):

libs/langchain/tests/unit_tests/schema/runnable/test_runnable.py

@@ -2782,7 +2782,8 @@ def test_representation_of_runnables() -> None:
     ), "repr where code string contains multiple lambdas gives up"
 
 
-def test_tool_from_runnable() -> None:
+@pytest.mark.asyncio
+async def test_tool_from_runnable() -> None:
     prompt = (
         SystemMessagePromptTemplate.from_template("You are a nice assistant.")
         + "{question}"
@@ -2795,6 +2796,12 @@ def test_tool_from_runnable() -> None:
 
     assert isinstance(chain_tool, BaseTool)
     assert chain_tool.name == "chain_tool"
+    assert chain_tool.run({"question": "What up"}) == chain.invoke(
+        {"question": "What up"}
+    )
+    assert await chain_tool.arun({"question": "What up"}) == await chain.ainvoke(
+        {"question": "What up"}
+    )
     assert chain_tool.description.endswith(repr(chain))
     assert chain_tool.args_schema.schema() == chain.input_schema.schema()
     assert chain_tool.args_schema.schema() == {