# fiftyone.core.selection_context Selection service extension points. Copyright 2017-2026, Voxel51, Inc.
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**Functions:** | [`register_selection_context`](#fiftyone.core.selection_context.register_selection_context)(actor_provider, ...) | Registers request identity and write-access checks for selection APIs. | |--------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------| | [`get_actor`](#fiftyone.core.selection_context.get_actor)() | Returns the current actor, or None for local SDK operations. | | [`check_access`](#fiftyone.core.selection_context.check_access)(dataset, action) | Raises if the registered policy denies a selection write. | ### fiftyone.core.selection_context.register_selection_context(actor_provider, access_checker) Registers request identity and write-access checks for selection APIs. The access checker receives a dataset and either `"edit"` or `"tag"`. It must raise before a denied operation. The actor provider is evaluated in the caller’s context, including background workers. Without a provider, selection operations use the local SDK’s unrestricted access. * **Returns:** a function that restores the previous registration ### fiftyone.core.selection_context.get_actor() Returns the current actor, or None for local SDK operations. ### fiftyone.core.selection_context.check_access(dataset, action) Raises if the registered policy denies a selection write.