diff --git a/dspy/predict/react.py b/dspy/predict/react.py
index ce8edaa46d..28640d5d10 100644
--- a/dspy/predict/react.py
+++ b/dspy/predict/react.py
@@ -9,7 +9,7 @@
 
 class Tool:
     def __init__(self, func: Callable, name: str = None, desc: str = None, args: dict[str, Any] = None):
-        annotations_func = func if inspect.isfunction(func) else func.__call__
+        annotations_func = func if inspect.isfunction(func) or inspect.ismethod(func) else func.__call__
         self.func = func
         self.name = name or getattr(func, '__name__', type(func).__name__)
         self.desc = desc or getattr(func, '__doc__', None) or getattr(annotations_func, '__doc__', "")
diff --git a/tests/predict/test_react.py b/tests/predict/test_react.py
index 8435f86a9e..4c6a150db4 100644
--- a/tests/predict/test_react.py
+++ b/tests/predict/test_react.py
@@ -2,6 +2,7 @@
 
 import dspy
 from dspy.utils.dummies import DummyLM, dummy_rm
+from dspy.predict import react
 
 
 # def test_example_no_tools():
@@ -121,4 +122,28 @@
 #     react = dspy.ReAct(ExampleSignature)
 
 #     assert react.react[0].signature.instructions is not None
-#     assert react.react[0].signature.instructions.startswith("You are going to generate output based on input.")
\ No newline at end of file
+#     assert react.react[0].signature.instructions.startswith("You are going to generate output based on input.")
+
+def test_tool_from_function():
+    def foo(a: int, b: int) -> int:
+        """Add two numbers."""
+        return a + b
+    
+    tool = react.Tool(foo)
+    assert tool.name == "foo"
+    assert tool.desc == "Add two numbers."
+    assert tool.args == {"a": "int", "b": "int"}
+
+def test_tool_from_class():
+    class Foo:
+        def __init__(self, user_id: str):
+            self.user_id = user_id
+
+        def foo(self, a: int, b: int) -> int:
+            """Add two numbers."""
+            return a + b
+
+    tool = react.Tool(Foo("123").foo)
+    assert tool.name == "foo"
+    assert tool.desc == "Add two numbers."
+    assert tool.args == {"a": "int", "b": "int"}