diff --git a/optype/inspect.py b/optype/inspect.py
new file mode 100644
index 0000000..7ae61c1
--- /dev/null
+++ b/optype/inspect.py
@@ -0,0 +1,130 @@
+from __future__ import annotations
+
+import inspect
+import itertools
+import sys
+from typing import TYPE_CHECKING, Any, cast, get_args as _get_args
+
+
+if sys.version_info >= (3, 13):
+    from typing import TypeAliasType, is_protocol
+else:
+    from typing_extensions import TypeAliasType, is_protocol
+
+
+if TYPE_CHECKING:
+    from types import ModuleType
+
+
+__all__ = (
+    'get_args',
+    'get_protocol_members',
+    'get_protocols',
+    'is_runtime_protocol',
+)
+
+
+def is_runtime_protocol(cls: type, /) -> bool:
+    """
+    Check if `cls` is a `typing[_extensions].Protocol` that's decorated with
+    `typing[_extensions].runtime_checkable`.
+    """
+    return is_protocol(cls) and getattr(cls, '_is_runtime_protocol', False)
+
+
+def get_args(tp: TypeAliasType | type | str | Any, /) -> tuple[Any, ...]:
+    """
+    A less broken implementation of `typing[_extensions].get_args()` that
+
+    - also works for type aliases defined with the PEP 695 `type` keyword, and
+    - recursively flattens nested of union'ed type aliases.
+    """
+    args = _get_args(tp.__value__ if isinstance(tp, TypeAliasType) else tp)
+    return tuple(itertools.chain(*(get_args(arg) or [arg] for arg in args)))
+
+
+def get_protocol_members(cls: type, /) -> frozenset[str]:
+    """
+    A variant of `typing[_extensions].get_protocol_members()` that
+
+    - doesn't hide `__dict__` or `__annotations__`,
+    - doesn't add a `__hash__` if there's an `__eq__` method, and
+    - doesn't include methods of base types from different module.
+    """
+    if not is_protocol(cls):
+        msg = f'{cls!r} is not a protocol'
+        raise TypeError(msg)
+
+    module_blacklist = {'typing', 'typing_extensions'}
+    annotations, module = cls.__annotations__, cls.__module__
+    members = annotations.keys() | {
+        name for name, v in vars(cls).items()
+        if (
+            name != '__new__'
+            and callable(v)
+            and (
+                v.__module__ == module
+                or (
+                    # Fun fact: Each `@overload` returns the same dummy
+                    # function; so there's no reference your wrapped method :).
+                    # Oh and BTW; `typing.get_overloads` only works on the
+                    # non-overloaded method...
+                    # Oh, you mean the one that # you shouldn't define within
+                    # a `typing.Protocol`?
+                    # Yes exactly! Anyway, good luck searching for the
+                    # undocumented and ever-changing dark corner of the
+                    # `typing` internals. I'm sure it must be there somewhere!
+                    # Oh yea if you can't find it, try `typing_extensions`.
+                    # Oh, still can't find it? Did you try ALL THE VERSIONS?
+                    #
+                    # ...anyway, the only thing we know here, is the name of
+                    # an overloaded method. But we have no idea how many of
+                    # them there *were*, let alone their signatures.
+                    v.__module__ in module_blacklist
+                    and v.__name__ == '_overload_dummy'
+                )
+            )
+        ) or (
+            isinstance(v, property)
+            and v.fget
+            and v.fget.__module__ == module
+        )
+    }
+
+    # this hack here is plagiarized from the (often incorrect)
+    # `typing_extensions.get_protocol_members`.
+    # Maybe the `typing.get_protocol_member`s` that's coming in 3.13 will
+    # won't be as broken. I have little hope though...
+    members |= cast(
+        set[str],
+        getattr(cls, '__protocol_attrs__', None) or set(),
+    )
+
+    # sometimes __protocol_attrs__ hallicunates some non-existing dunders.
+    # the `getattr_static` avoids potential descriptor magic
+    members = {
+        member for member in members
+        if member in annotations
+        or inspect.getattr_static(cls, member) is not None
+        # or getattr(cls, member) is not None
+    }
+
+    # also include any of the parents
+    for supercls in cls.mro()[1:]:
+        if is_protocol(supercls):
+            members |= get_protocol_members(supercls)
+
+    return frozenset(members)
+
+
+def get_protocols(
+    module: ModuleType,
+    /,
+    private: bool = False,
+) -> frozenset[type]:
+    """Return the protocol types within the given module."""
+    return frozenset({
+        cls for name in dir(module)
+        if (private or not name.startswith('_'))
+        and is_protocol(cls := getattr(module, name))
+    })
diff --git a/tests/helpers.py b/tests/helpers.py
index 3935bc4..165964f 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -1,15 +1,13 @@
 from __future__ import annotations
 
-import inspect
 import sys
-from typing import TYPE_CHECKING, Any, cast, get_args as _get_args
+from typing import TYPE_CHECKING
 
 
 if sys.version_info >= (3, 13):
-    from typing import TypeAliasType, is_protocol
+    from typing import is_protocol
 else:
-    from typing_extensions import TypeAliasType, is_protocol
-
+    from typing_extensions import is_protocol
 
 if TYPE_CHECKING:
     from types import ModuleType
@@ -19,122 +17,23 @@
 
 __all__ = (
     'get_callable_members',
-    'get_protocol_members',
-    'get_protocols',
     'is_dunder',
     'is_protocol',
     'pascamel_to_snake',
 )
 
 
-def is_runtime_protocol(cls: type, /) -> bool:
-    """Check if `cls` is a `@runtime_checkable` `typing.Protocol`."""
-    return is_protocol(cls) and getattr(cls, '_is_runtime_protocol', False)
-
-
-def get_args(tp: TypeAliasType | type | str | Any, /) -> tuple[Any, ...]:
+def get_callable_members(module: ModuleType, /) -> frozenset[str]:
     """
-    A less broken `typing.get_args()` that also works for type aliases defined
-    with the PEP695 `type` keyword, and recurses nested type aliases.
+    Return the public callables of a module, that aren't protocols, and
     """
-    args = _get_args(tp.__value__ if isinstance(tp, TypeAliasType) else tp)
-    args_flat: list[Any] = []
-    for arg in args:
-        # recurse nested
-        args_flat.extend(get_args(arg) or [arg])
-
-    return tuple(args_flat)
-
-
-def get_protocol_members(cls: type, /) -> frozenset[str]:
-    """
-    A variant of `typing_extensions.get_protocol_members()` that doesn't
-    hide e.g. `__dict__` and `__annotations__`, or adds `__hash__` if there's
-    an `__eq__` method.
-    Does not return method names of base classes defined in another module.
-    """
-    assert is_protocol(cls)
-
-    module = cls.__module__
-    annotations = cls.__annotations__
-
-    members = annotations.keys() | {
-        name for name, v in vars(cls).items()
-        if (
-            name != '__new__'
-            and callable(v)
-            and (
-                v.__module__ == module
-                or (
-                    # Fun fact: Each `@overload` returns the same dummy
-                    # function; so there's no reference your wrapped method :).
-                    # Oh and BTW; `typing.get_overloads` only works on the
-                    # non-overloaded method...
-                    # Oh, you mean the one that # you shouldn't define within
-                    # a `typing.Protocol`?
-                    # Yes exactly! Anyway, good luck searching for the
-                    # undocumented and ever-changing dark corner of the
-                    # `typing` internals. I'm sure it must be there somewhere!
-                    # Oh yea if you can't find it, try `typing_extensions`.
-                    # Oh, still can't find it? Did you try ALL THE VERSIONS?
-                    #
-                    # ...anyway, the only thing we know here, is the name of
-                    # an overloaded method. But we have no idea how many of
-                    # them there *were*, let alone their signatures.
-                    v.__module__.startswith('typing')
-                    and v.__name__ == '_overload_dummy'
-                )
-            )
-        ) or (
-            isinstance(v, property)
-            and v.fget
-            and v.fget.__module__ == module
-        )
-    }
-
-    # this hack here is plagiarized from the (often incorrect)
-    # `typing_extensions.get_protocol_members`.
-    # Maybe the `typing.get_protocol_member`s` that's coming in 3.13 will
-    # won't be as broken. I have little hope though...
-    members |= cast(
-        set[str],
-        getattr(cls, '__protocol_attrs__', None) or set(),
-    )
-
-    # sometimes __protocol_attrs__ hallicunates some non-existing dunders.
-    # the `getattr_static` avoids potential descriptor magic
-    members = {
-        member for member in members
-        if member in annotations
-        or inspect.getattr_static(cls, member) is not None
-        # or getattr(cls, member) is not None
-    }
-
-    # also include any of the parents
-    for supercls in cls.mro()[1:]:
-        if is_protocol(supercls):
-            members |= get_protocol_members(supercls)
-
-    return frozenset(members)
-
-
-def get_protocols(module: ModuleType) -> frozenset[type]:
-    """Return the public protocol types within the given module."""
-    return frozenset({
-        cls for name in dir(module)
-        if not name.startswith('_')
-        and is_protocol(cls := getattr(module, name))
-    })
-
-
-def get_callable_members(module: ModuleType) -> frozenset[str]:
-    """Return the public protocol types within the given module."""
+    module_blacklist = {'typing', 'typing_extensions'}
     return frozenset({
         name for name in dir(module)
         if not name.startswith('_')
         and callable(cls := getattr(module, name))
         and not is_protocol(cls)
-        and getattr(module, name).__module__ != 'typing'
+        and getattr(module, name).__module__ not in module_blacklist
     })
 
 
diff --git a/tests/numpy/test_sctypes.py b/tests/numpy/test_sctypes.py
index c761bc5..d255a2c 100644
--- a/tests/numpy/test_sctypes.py
+++ b/tests/numpy/test_sctypes.py
@@ -6,7 +6,7 @@
 
 import optype.numpy as onp
 from optype.numpy import _sctype  # noqa: PLC2701  # pyright: ignore[reportPrivateUsage]
-from ..helpers import get_args  # noqa: TID252
+from optype.inspect import get_args
 
 
 _TEMPORAL = 'Timedelta64', 'Datetime64'
diff --git a/tests/test_protocols.py b/tests/test_protocols.py
index 8945a5b..f877e2f 100644
--- a/tests/test_protocols.py
+++ b/tests/test_protocols.py
@@ -5,14 +5,16 @@
 import optype._do
 import optype._does
 import optype._has
+from optype.inspect import (
+    get_protocol_members,
+    get_protocols,
+    is_runtime_protocol,
+)
 
 from .helpers import (
     get_callable_members,
-    get_protocol_members,
-    get_protocols,
     is_dunder,
     is_protocol,
-    is_runtime_protocol,
     pascamel_to_snake,
 )