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langchain-ai · Dec 19, 2024 · acbb087 · acbb087
1 parent fe84a9a
commit acbb087
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/libs/core/tests/unit_tests/test_tools.py b/libs/core/tests/unit_tests/test_tools.py
@@ -2255,3 +2255,20 @@ def foo(x: int) -> Bar:
     assert foo.invoke(
         {"type": "tool_call", "args": {"x": 0}, "name": "foo", "id": "bar"}
     ) == Bar(x=0)
+
+
+def test_tool_mutate_input() -> None:
+    class MyTool(BaseTool):
+        name: str = "MyTool"
+        description: str = "a tool"
+
+        def _run(
+            self,
+            x: str,
+            run_manager: Optional[CallbackManagerForToolRun] = None,
+        ) -> str:
+            return "hi"
+
+    my_input = {"x": "hi"}
+    MyTool().invoke(my_input)
+    assert my_input == {"x": "hi"}