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Python: pass explicit None to optional kernel function parameters unchanged #14764

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Python: pass explicit None to optional kernel function parameters unchanged #14764

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c057217
Python: skip coercion for None arguments
anubhavlal07 Nov 9, 2026
7236ac3
Python: keep None checks for non-optional params
anubhavlal07 Nov 11, 2026
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3 changes: 2 additions & 1 deletion python/semantic_kernel/functions/kernel_function_from_method.py
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Original file line number Diff line number Diff line change
Expand Up @@ -177,7 +177,8 @@ def gather_function_parameters(self, context: FunctionInvocationContext) -> dict
if param.name in context.arguments:
value: Any = context.arguments[param.name]
if (
param.type_
value is not None
and param.type_
and "," not in param.type_
and param.type_object
and param.type_object is not inspect._empty
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18 changes: 18 additions & 0 deletions python/tests/unit/functions/test_kernel_function_from_method.py
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Original file line number Diff line number Diff line change
Expand Up @@ -682,6 +682,24 @@ async def override_stream(stream):
]


async def test_explicit_none_for_optional_parameters_is_not_coerced(kernel: Kernel):
@kernel_function
def func_optional(
count: int | None = None,
label: Annotated[str | None, "A label"] = None,
item: CustomTypeDataclass | None = None,
) -> Any:
return (count, label, item)

func = kernel.add_function(plugin_name="test", function=func_optional)

res = await kernel.invoke(func, arguments=KernelArguments(count=None, label=None, item=None))
assert res.value == (None, None, None)

res = await kernel.invoke(func, arguments=KernelArguments(count="3", label="x"))
assert res.value == (3, "x", None)


async def test_default_handling(kernel: Kernel):
@kernel_function
def func_default(input: str = "test"):
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