From be300284d5a556304b97e400e44df3f9693c92cc Mon Sep 17 00:00:00 2001
From: Wouter Zwerink <zwerinkw@gmail.com>
Date: Sun, 3 Aug 2025 00:30:28 +0200
Subject: [PATCH 1/3] Treat kwarg_only as OptionInfo

---
 tests/test_ambiguous_params.py | 18 ++++++++++++++++++
 typer/main.py                  |  5 ++++-
 typer/models.py                |  2 ++
 typer/utils.py                 |  2 +-
 4 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/tests/test_ambiguous_params.py b/tests/test_ambiguous_params.py
index 0693c8e9aa..e15bab1071 100644
--- a/tests/test_ambiguous_params.py
+++ b/tests/test_ambiguous_params.py
@@ -229,3 +229,21 @@ def cmd(
 )
 def test_error_rendering(error, message):
     assert str(error) == message
+
+
+def test_keyword_only_without_default_becomes_option():
+    app = typer.Typer()
+
+    @app.command()
+    def cmd(*, my_param):
+        print(my_param)
+
+    # Check that it works with the keyword
+    result = runner.invoke(app, ["--my-param", "hello"])
+    assert result.exit_code == 0, result.output
+    assert "hello" in result.output
+
+    # Check that it fails without the keyword
+    result = runner.invoke(app, ["hello"])
+    assert result.exit_code != 0, result.output
+    assert "Missing option" in result.output, result.output
diff --git a/typer/main.py b/typer/main.py
index 59e22c77aa..c4fff79e1b 100644
--- a/typer/main.py
+++ b/typer/main.py
@@ -823,7 +823,10 @@ def get_click_param(
             default_value = parameter_info.default
     elif param.default == Required or param.default is param.empty:
         required = True
-        parameter_info = ArgumentInfo()
+        if param.kind == inspect.Parameter.KEYWORD_ONLY:
+            parameter_info = OptionInfo()
+        else:
+            parameter_info = ArgumentInfo()
     else:
         default_value = param.default
         parameter_info = OptionInfo()
diff --git a/typer/models.py b/typer/models.py
index e0bddb965b..c2ac4b5775 100644
--- a/typer/models.py
+++ b/typer/models.py
@@ -514,10 +514,12 @@ def __init__(
         name: str,
         default: Any = inspect.Parameter.empty,
         annotation: Any = inspect.Parameter.empty,
+        kind: inspect.Parameter = inspect.Parameter.POSITIONAL_OR_KEYWORD,
     ) -> None:
         self.name = name
         self.default = default
         self.annotation = annotation
+        self.kind = kind
 
 
 class DeveloperExceptionConfig:
diff --git a/typer/utils.py b/typer/utils.py
index 81dc4dd61d..091bd8cf7c 100644
--- a/typer/utils.py
+++ b/typer/utils.py
@@ -185,6 +185,6 @@ def get_params_from_function(func: Callable[..., Any]) -> Dict[str, ParamMeta]:
             default = parameter_info
 
         params[param.name] = ParamMeta(
-            name=param.name, default=default, annotation=annotation
+            name=param.name, default=default, annotation=annotation, kind=param.kind
         )
     return params

From c17b63e015e20f118c94b2d5ef2fedb1a0d82d03 Mon Sep 17 00:00:00 2001
From: Wouter Zwerink <zwerinkw@gmail.com>
Date: Sat, 9 Aug 2025 01:04:01 +0200
Subject: [PATCH 2/3] Appease MyPy

---
 typer/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/typer/models.py b/typer/models.py
index c2ac4b5775..6cbc5d9cc9 100644
--- a/typer/models.py
+++ b/typer/models.py
@@ -514,7 +514,7 @@ def __init__(
         name: str,
         default: Any = inspect.Parameter.empty,
         annotation: Any = inspect.Parameter.empty,
-        kind: inspect.Parameter = inspect.Parameter.POSITIONAL_OR_KEYWORD,
+        kind: inspect._ParameterKind = inspect.Parameter.POSITIONAL_OR_KEYWORD
     ) -> None:
         self.name = name
         self.default = default

From 5462ee968789a8fb2330a18a2f5b81bcd4a90e09 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Fri, 8 Aug 2025 23:04:10 +0000
Subject: [PATCH 3/3] =?UTF-8?q?=F0=9F=8E=A8=20[pre-commit.ci]=20Auto=20for?=
 =?UTF-8?q?mat=20from=20pre-commit.com=20hooks?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 typer/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/typer/models.py b/typer/models.py
index 6cbc5d9cc9..ee1ffa2d4c 100644
--- a/typer/models.py
+++ b/typer/models.py
@@ -514,7 +514,7 @@ def __init__(
         name: str,
         default: Any = inspect.Parameter.empty,
         annotation: Any = inspect.Parameter.empty,
-        kind: inspect._ParameterKind = inspect.Parameter.POSITIONAL_OR_KEYWORD
+        kind: inspect._ParameterKind = inspect.Parameter.POSITIONAL_OR_KEYWORD,
     ) -> None:
         self.name = name
         self.default = default