diff --git a/python/packages/autogen-core/src/autogen_core/_function_utils.py b/python/packages/autogen-core/src/autogen_core/_function_utils.py
index 891027842794..40e30a0d398f 100644
--- a/python/packages/autogen-core/src/autogen_core/_function_utils.py
+++ b/python/packages/autogen-core/src/autogen_core/_function_utils.py
@@ -41,9 +41,8 @@ def get_typed_signature(call: Callable[..., Any]) -> inspect.Signature:
         The signature of the function with type annotations
     """
     signature = inspect.signature(call)
-    globalns = getattr(call, "__globals__", {})
     func_call = call.func if isinstance(call, partial) else call
-    type_hints = typing.get_type_hints(func_call, globalns, include_extras=True)
+    type_hints = typing.get_type_hints(func_call, include_extras=True)
     typed_params = [
         inspect.Parameter(
             name=param.name,
@@ -73,8 +72,7 @@ def get_typed_return_annotation(call: Callable[..., Any]) -> Any:
     if annotation is inspect.Signature.empty:
         return None
 
-    globalns = getattr(call, "__globals__", {})
-    type_hints = typing.get_type_hints(call, globalns, include_extras=True)
+    type_hints = typing.get_type_hints(call, include_extras=True)
     return type_hints.get("return", inspect.Signature.empty)
 
 
diff --git a/python/packages/autogen-core/tests/test_wrapped_annotations.py b/python/packages/autogen-core/tests/test_wrapped_annotations.py
new file mode 100644
index 000000000000..a0e284ac14b5
--- /dev/null
+++ b/python/packages/autogen-core/tests/test_wrapped_annotations.py
@@ -0,0 +1,57 @@
+from datetime import datetime
+from functools import wraps
+from types import ModuleType
+from typing import Any, Callable
+
+import pytest
+from autogen_core import CancellationToken
+from autogen_core._function_utils import get_function_schema, get_typed_return_annotation, get_typed_signature
+from autogen_core.tools import FunctionTool
+
+
+@pytest.fixture(params=[0, 1, 2])
+def wrapped_function(request: pytest.FixtureRequest) -> Callable[..., Any]:
+    module = ModuleType("wrapped_tool_module")
+    exec(
+        "from datetime import datetime as Timestamp\n"
+        "def echo(value: 'Timestamp') -> 'Timestamp':\n"
+        "    return value\n",
+        module.__dict__,
+    )
+
+    def decorate(original: Callable[..., Any]) -> Callable[..., Any]:
+        @wraps(original)
+        def wrapper(*args: Any, **kwargs: Any) -> Any:
+            return original(*args, **kwargs)
+
+        return wrapper
+
+    function: Callable[..., Any] = module.echo
+    for _ in range(request.param):
+        function = decorate(function)
+    return function
+
+
+def test_wrapped_function_signature(wrapped_function: Callable[..., Any]) -> None:
+    signature = get_typed_signature(wrapped_function)
+    assert signature.parameters["value"].annotation is datetime
+    assert signature.return_annotation is datetime
+
+
+def test_wrapped_function_return_annotation(wrapped_function: Callable[..., Any]) -> None:
+    assert get_typed_return_annotation(wrapped_function) is datetime
+
+
+def test_wrapped_function_schema(wrapped_function: Callable[..., Any]) -> None:
+    schema = get_function_schema(wrapped_function, description="Echo a timestamp.")
+    assert schema["function"]["parameters"]["properties"]["value"]["format"] == "date-time"
+
+
+@pytest.mark.asyncio
+async def test_wrapped_function_tool(wrapped_function: Callable[..., Any]) -> None:
+    tool = FunctionTool(wrapped_function, description="Echo a timestamp.")
+    schema = tool.schema
+    assert "parameters" in schema
+    assert schema["parameters"]["properties"]["value"]["format"] == "date-time"
+    assert tool.return_type() is datetime
+    assert await tool.run_json({"value": "2026-10-05T12:00:00"}, CancellationToken()) == datetime(2026, 10, 5, 12)