# logFeedbackAttachment(sentiment:issues:desiredOutput:) Logs and serializes a feedback attachment that can be submitted to Apple. ``` @discardableResult final func logFeedbackAttachment(sentiment: LanguageModelFeedback.Sentiment?, issues: [LanguageModelFeedback.Issue] = [], desiredOutput: Transcript.Entry? = nil) -> Data ``` ## Parameters `sentiment` An optional sentiment rating about the model’s output (positive, negative, or neutral). `issues` An array of specific issues identified with the model’s response. Defaults to an empty array. `desiredOutput` An optional transcript entry showing what the desired output should have been. ## Return Value A `Data` object containing the JSON-encoded feedback attachment that can be submitted to Feedback Assistant. ## Discussion This method creates a structured feedback attachment containing the session’s transcript and any provided feedback information. The attachment can be saved to a file and submitted to Apple using [Feedback Assistant](https://feedbackassistant.apple.com). If an error occurred during a previous response, any rejected entries that were rolled back from the transcript are included in the feedback data. ```swift let session = LanguageModelSession() let response = try await session.respond(to: "What is the capital of France?") // Create feedback for a helpful response let feedbackData = session.logFeedbackAttachment(sentiment: .positive) // Or create feedback for a problematic response let feedbackData = session.logFeedbackAttachment( sentiment: .negative, issues: [ LanguageModelFeedback.Issue( category: .incorrect, explanation: "The model provided outdated information" ) ], desiredOutput: Transcript.Entry.response(...) ) ``` If your `desiredOutput` is a string, use [`Transcript.Entry.response(_:)`](/documentation/FoundationModels/Transcript/Entry/response(_:)) to turn your desired output into a [`Transcript`](/documentation/FoundationModels/Transcript) entry: ```swift let text = Transcript.TextSegment(content: "The capital of France is Paris.") let segment = Transcript.Segment.text(text) let response = Transcript.Response(segments: [segment]) let entry = Transcript.Entry.response(response) ``` If your `desiredOutput` is a [`Generable`](/documentation/FoundationModels/Generable) type, turning that into a [`Transcript`](/documentation/FoundationModels/Transcript) entry is slightly different: ```swift let customType = MyCustomType(...) // A generable type. let structure = Transcript.StructuredSegment(schemaName: String(describing: Foo.self), content: customType.generatedContent) let segment = Transcript.Segment.structure(structure) let response = Transcript.Response(segments: [segment]) let entry = Transcript.Entry.response(response) ``` Finally, if you’d like to submit the feedback to Apple, write your feedback to a `.json` file and include the file as an attachment to [Feedback Assistant](https://feedbackassistant.apple.com). You can include one or many feedback attachment in the same file: ```swift let allFeedback = feedbackData + feedbackData2 + feedbackData3 let url = URL(fileURLWithPath: "path/to/save/feedback.json") try allFeedback.write(to: url) ``` --- 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)