diff --git a/arro3-core/python/arro3/core/_rust.pyi b/arro3-core/python/arro3/core/_rust.pyi
new file mode 100644
index 0000000..02f945f
--- /dev/null
+++ b/arro3-core/python/arro3/core/_rust.pyi
@@ -0,0 +1,54 @@
+from typing import Self
+from numpy.typing import NDArray
+
+from .types import ArrowArrayExportable, ArrowSchemaExportable, ArrowStreamExportable
+
+class Array:
+    def __array__(self) -> NDArray: ...
+    def __arrow_c_array__(self, requested_schema) -> object: ...
+    def __eq__(self) -> bool: ...
+    def __len__(self) -> bool: ...
+    @classmethod
+    def from_arrow(cls, input: ArrowArrayExportable) -> Self: ...
+    def to_numpy(self) -> NDArray: ...
+
+class ChunkedArray:
+    def __array__(self) -> NDArray: ...
+    def __arrow_c_stream__(self, requested_schema) -> object: ...
+    def __eq__(self) -> bool: ...
+    def __len__(self) -> bool: ...
+    @classmethod
+    def from_arrow(cls, input: ArrowStreamExportable) -> Self: ...
+    def to_numpy(self) -> NDArray: ...
+
+class Field:
+    def __arrow_c_schema__(self) -> object: ...
+    def __eq__(self) -> bool: ...
+    @classmethod
+    def from_arrow(cls, input: ArrowSchemaExportable) -> Self: ...
+
+class RecordBatch:
+    def __arrow_c_array__(self, requested_schema) -> object: ...
+    def __eq__(self) -> bool: ...
+    @classmethod
+    def from_arrow(cls, input: ArrowArrayExportable) -> Self: ...
+
+class RecordBatchReader:
+    def __arrow_c_stream__(self, requested_schema) -> object: ...
+    @classmethod
+    def from_arrow(cls, input: ArrowStreamExportable) -> Self: ...
+    def schema(self) -> Schema: ...
+
+class Schema:
+    def __arrow_c_schema__(self) -> object: ...
+    def __eq__(self) -> bool: ...
+    @classmethod
+    def from_arrow(cls, input: ArrowSchemaExportable) -> Self: ...
+
+class Table:
+    def __arrow_c_stream__(self, requested_schema) -> object: ...
+    def __eq__(self) -> bool: ...
+    def __len__(self) -> bool: ...
+    @classmethod
+    def from_arrow(cls, input: ArrowStreamExportable) -> Self: ...
+    def schema(self) -> Schema: ...
diff --git a/arro3-core/python/arro3/core/py.typed b/arro3-core/python/arro3/core/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/arro3-core/python/arro3/core/types.py b/arro3-core/python/arro3/core/types.py
new file mode 100644
index 0000000..1ed9a51
--- /dev/null
+++ b/arro3-core/python/arro3/core/types.py
@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from typing import Protocol, Tuple
+
+
+class ArrowSchemaExportable(Protocol):
+    """An Arrow or GeoArrow schema or field."""
+
+    def __arrow_c_schema__(self) -> object: ...
+
+
+class ArrowArrayExportable(Protocol):
+    """An Arrow or GeoArrow array or RecordBatch."""
+
+    def __arrow_c_array__(
+        self, requested_schema: object | None = None
+    ) -> Tuple[object, object]: ...
+
+
+class ArrowStreamExportable(Protocol):
+    """An Arrow or GeoArrow ChunkedArray or Table."""
+
+    def __arrow_c_stream__(self, requested_schema: object | None = None) -> object: ...