Python: preserve shared Annotated parameter metadata

python/semantic_kernel/functions/kernel_function_decorator.py

@@ -151,6 +151,7 @@ def _parse_parameter(name: str, param: Any, default: Any) -> dict[str, Any]:
                 if isinstance(meta, str):
                     ret["description"] = meta
                 elif isinstance(meta, dict):
+                    meta = meta.copy()
                     # only override from the metadata if it is not already set
                     if "description" not in ret and (description := meta.pop("description", None)):
                         ret["description"] = description

python/tests/unit/functions/test_kernel_function_decorators.py

@@ -131,6 +131,22 @@ def test_kernel_function_param_annotated():
     assert my_func.__kernel_function_parameters__[0]["name"] == "input"
 
 
+def test_kernel_function_does_not_mutate_shared_annotated_metadata():
+    shared = {"description": "the answer count"}
+
+    @kernel_function
+    def first(value: Annotated[int, shared]) -> int:
+        return value
+
+    @kernel_function
+    def second(value: Annotated[int, shared]) -> int:
+        return value
+
+    assert shared == {"description": "the answer count"}
+    assert first.__kernel_function_parameters__[0]["description"] == "the answer count"
+    assert second.__kernel_function_parameters__[0]["description"] == "the answer count"
+
+
 def test_kernel_function_param_optional():
     decorator_test = MiscClass()
     my_func = getattr(decorator_test, "func_input_optional")