Foundation Models OS 27 Updater

Use this skill to migrate a Foundation Models project from the OS 26 API surface to OS 27. The target may be an app, Swift package, sample, CLI, framework, tutorial repo, or documentation repo. Do not assume it is Foundation Lab or has this repository's structure.

The goal is not to sprinkle OS 27 names into code. The goal is to make the project take real advantage of OS 27 where it helps: better runtime selection, context management, tool policy, multimodal input, transcript handling, observability, and honest availability behavior.

Operating Principles

• Start from the target project, not from a generic example.
• Inspect the installed Xcode 27 SDK before claiming an API exists.
• Preserve unrelated user changes.
• Prefer small typed adapters over one giant compatibility layer.
• Keep OS 27 features discoverable without forcing demos that do not fit the product.
• Make availability, entitlement, service eligibility, quota, and platform gates visible in code and docs.
• Compile with Xcode 27 even if runtime smoke tests require OS 27 hardware.

First Pass: Understand The Project

Run a fast audit before editing: