# LanguageModelSession.SessionProperty A property wrapper that provides access to properties from within profiles, dynamic instructions, and tools. ``` @propertyWrapper struct SessionProperty ``` ## Overview Use this to access properties across a language model session, like to access the session history: ```swift // Get a reference to the session history. @SessionProperty(\.history) var history ``` To create a custom session property, use [`SessionPropertyEntry()`](/documentation/FoundationModels/SessionPropertyEntry()) to define a custom key that you access with [`LanguageModelSession.SessionProperty`](/documentation/FoundationModels/LanguageModelSession/SessionProperty). ## Topics ### Creating a session property [`init(ReferenceWritableKeyPath)`](/documentation/FoundationModels/LanguageModelSession/SessionProperty/init(_:)) Creates a session property with the specified key path. ### Accessing the property value [`var wrappedValue: Value`](/documentation/FoundationModels/LanguageModelSession/SessionProperty/wrappedValue) The wrapped value of this property wrapper. ## Relationships ### Conforms To [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)