fix(skills): address code review feedback on iOS 26 skill examples

- Add required name/description properties and @Generable to RecipeSearchTool
- Fix missing argument label in session.respond(to:) call
- Remove non-existent .scrollExtensionMode API, replace with correct guidance
- Change PhotoProcessor from struct to class for cache mutation support
- Fix method name mismatch in @concurrent example caller

skills/foundation-models-on-device/SKILL.md

@@ -113,7 +113,11 @@ Let the model invoke custom code for domain-specific tasks:
 
 ```swift
 struct RecipeSearchTool: Tool {
-    struct Arguments: Codable {
+    let name = "recipe_search"
+    let description = "Search for recipes matching a given term and return a list of results."
+
+    @Generable
+    struct Arguments {
         var searchTerm: String
         var numberOfResults: Int
     }
@@ -139,7 +143,7 @@ let response = try await session.respond(to: "Find me some pasta recipes")
 
 ```swift
 do {
-    let answer = try await session.respond("Find a recipe for tomato soup.")
+    let answer = try await session.respond(to: "Find a recipe for tomato soup.")
 } catch let error as LanguageModelSession.ToolCallError {
     print(error.tool.name)
     if case .databaseIsEmpty = error.underlyingError as? RecipeSearchToolError {

skills/liquid-glass-design/SKILL.md

@@ -124,13 +124,9 @@ Button("Toggle") {
 .buttonStyle(.glass)
 ```
 
-### Scroll and Sidebar Extensions
+### Extending Horizontal Scrolling Under Sidebar
 
-```swift
-// Extend horizontal scroll under sidebar
-ScrollView(.horizontal) { /* content */ }
-    .scrollExtensionMode(.underSidebar)
-```
+To allow horizontal scroll content to extend under a sidebar or inspector, ensure the `ScrollView` content reaches the leading/trailing edges of the container. The system automatically handles the under-sidebar scrolling behavior when the layout extends to the edges — no additional modifier is needed.
 
 ## Core Pattern — UIKit
 

skills/swift-concurrency-6-2/SKILL.md

@@ -137,8 +137,8 @@ This mode is opt-in and recommended for apps, scripts, and other executable targ
 When you need actual parallelism, explicitly offload with `@concurrent`:
 
 ```swift
-nonisolated struct PhotoProcessor {
-    var cachedStickers: [String: Sticker]
+nonisolated final class PhotoProcessor {
+    private var cachedStickers: [String: Sticker] = [:]
 
     func extractSticker(data: Data, with id: String) async -> Sticker {
         if let sticker = cachedStickers[id] {
@@ -156,7 +156,8 @@ nonisolated struct PhotoProcessor {
 }
 
 // Callers must await
-processedPhotos[item.id] = await PhotoProcessor().process(data: data)
+let processor = PhotoProcessor()
+processedPhotos[item.id] = await processor.extractSticker(data: data, with: item.id)
 ```
 
 To use `@concurrent`: