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Adopt Foundation Models OS 27 surfaces: image attachments and capabilities - #241
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…es, context size (cherry picked from commit 052f18f)
`SystemLanguageModel.contextSize` is back-deployed to OS 26.0 but first declared in the 26.4 SDK, so Xcode 26.0 fails to compile the passthrough. It is also unavailable on tvOS and watchOS.
Both are used solely by the OS 27 `ImageAttachment` extension, so they belong inside its compiler gate.
mattbpowell
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Attachment(cgImage) SIGKILLed the app on betas 1-4. On the 27.0 release, try alternative initializers (imageURL first, as verified on-device by huggingface/AnyLanguageModel#241, then flattened sRGB CGImage, then raw CGImage). The strategy in flight is persisted before construction; a leftover marker on next launch marks it failed so a user crashes at most once per strategy per OS build, then falls back to OCR automatically. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Carries @james-333i's commit from #206 on top of
main, with authorship preserved.On OS 27,
Transcriptimage segments now map toTranscript.Segment.attachmentwith anImageAttachment, built directly for file URLs and via ImageIO decoding for data sources.SystemLanguageModelexposescontextSizeandsupportsImageInput, which reports the OS 27visioncapability and returnsfalseon earlier OS versions. The OS 27 references are behind#if compiler(>=6.4)with runtime availability checks, so the deployment floor is unchanged. James verified the image path end to end on an iPhone running iOS 27.Two changes from #206:
maximumResponseTokenscommit is dropped. Forward all generation options to FoundationModels #230 already forwards every generation option.contextSizeis declared only on toolchains whose SDK has it. The property is back-deployed to OS 26.0 but first appears in the 26.4 SDK, and it is unavailable on tvOS and watchOS. That is why Adopt Foundation Models OS 27 surfaces: image attachments, capabilities, context size #206's Xcode 26.0 CI jobs failed.Closes #206.