diff --git a/.github/format.prompt.md b/.github/format.prompt.md
index 36fa667f5..8525d6f95 100644
--- a/.github/format.prompt.md
+++ b/.github/format.prompt.md
@@ -3,14 +3,11 @@ You are a Swift code formatter. Transform Swift code according to these specific
 **FORMATTING RULES:**
 1. **Indentation**: Use exactly 4 spaces for all indentation levels
 2. **Module prefixes**: Remove all module name prefixes from types (e.g., `SwiftUICore.AttributeGraph.CoreFoundation.TypeName` → `TypeName`)
-3. **Availability attributes**: Remove all `@available` attributes EXCEPT `@available(*, unavailable)`
+3. **Availability attributes**: Remove all `@_originallyDefinedIn` attributes
 4. **Compiler directives**: Remove all `#if compiler` conditional compilation blocks, keeping only one version of duplicate declarations
 5. **Member spacing**: Add blank lines between different members, properties, and functions
 6. **Colon spacing**: Remove spaces before colons in type annotations and conformances
-7. **Method bodies**: Add placeholder implementations using `preconditionFailure("TODO")` for:
-   - Function bodies (single line: `{ preconditionFailure("TODO") }`)
-   - Property getters (`get { preconditionFailure("TODO") }`)
-   - Property setters (`set { preconditionFailure("TODO") }`)
+7. **Method bodies**: Add placeholder implementations using `_openSwiftUIUnimplementedFailure()` if the implementation is missing:
 8. **Extensions**: Format protocol conformances on same line as extension when possible
 9. **Prefer Multiple Lines**: Use multiple lines for function parameters when there are more than 3 parameters, aligning them vertically.
 eg.
@@ -21,6 +18,12 @@ static func makeView<Value>(
     body: (_ view: _GraphValue<Value>, _ inputs: _ViewInputs) -> _ViewOutputs
 ) -> _ViewOutputs
 ```
+10. **Preserve implementation for @_alwaysEmitIntoClient and @inline** implementation
+11. **Add new line for @frozen and @MainActor** attributes before the struct or class declaration
+12. Keep the @_spi attribute but replace SwiftUI with OpenSwiftUI.
+13. Replace available attribute to the macro defination
+eg. @available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *) to @available(OpenSwiftUI_v1_0, *) and @available(iOS 18.0, macOS 15.0, tvOS 18.0, watchOS 11.0, *) to @available(OpenSwiftUI_v6_0, *)
+14. Replace `get { ... }` to `...` if the property only has a getter
 
 **INPUT FORMAT:** Swift code with various formatting inconsistencies
 **OUTPUT FORMAT:** Clean, consistently formatted Swift code following the above rules
@@ -28,45 +31,71 @@ static func makeView<Value>(
 **EXAMPLE:**
 Input:
 ```swift
+@_spi(ForSwiftUIOnly)
 @available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
 @_originallyDefinedIn(module: "SwiftUI", iOS 18.0)
 @_originallyDefinedIn(module: "SwiftUI", macOS 15.0)
 @_originallyDefinedIn(module: "SwiftUI", tvOS 18.0)
 @_originallyDefinedIn(module: "SwiftUI", watchOS 11.0)
-public struct _ViewInputs {
+@frozen public struct _ViewInputs {
   package var base: SwiftUICore._GraphInputs
   package var needsDisplayListAccessibility: Swift.Bool {
     get
     set
   }
+  package var value: Swift.Int { get }
   #if compiler(>=5.3) && $NoncopyableGenerics
   package mutating func popLast<T, U>(_ key: T.Type) -> U? where T : SwiftUICore.ViewInput, T.Value == SwiftUICore.Stack<U>
   #else
   package mutating func popLast<T, U>(_ key: T.Type) -> U? where T : SwiftUICore.ViewInput, T.Value == SwiftUICore.Stack<U>
   #endif
+
+  @_alwaysEmitIntoClient public static var test: Alignment {
+    get { .init(horizontal: .trailing, vertical: .lastTextBaseline) } }
 }
 @available(*, unavailable)
 extension SwiftUICore._ViewInputs : Swift.Sendable {
 }
+
+@_spi(ForSwiftUIOnly)
+@available(iOS 18.0, macOS 15.0, tvOS 18.0, watchOS 11.0, *)
+@_originallyDefinedIn(module: "SwiftUI", iOS 18.0)
+@_originallyDefinedIn(module: "SwiftUI", macOS 15.0)
+@_originallyDefinedIn(module: "SwiftUI", tvOS 18.0)
+@_originallyDefinedIn(module: "SwiftUI", watchOS 11.0)
+open class A {}
 ```
 
 Output:
 ```swift
+@_spi(ForOpenSwiftUIOnly)
+@available(OpenSwiftUI_v1_0, *)
+@frozen
 public struct _ViewInputs {
     package var base: _GraphInputs
     
     package var needsDisplayListAccessibility: Bool {
-        get { preconditionFailure("TODO") }
-        set { preconditionFailure("TODO") }
+        get { _openSwiftUIUnimplementedFailure() }
+        set { _openSwiftUIUnimplementedFailure() }
+    }
+
+    package var value: Swift.Int { 
+        _openSwiftUIUnimplementedFailure()
     }
 
     package mutating func popLast<T, U>(_ key: T.Type) -> U? where T: ViewInput, T.Value == Stack<U> {
-        preconditionFailure("TODO")
+        _openSwiftUIUnimplementedFailure()
+    }
+
+    @_alwaysEmitIntoClient
+    public static var test: Alignment {
+        .init(horizontal: .trailing, vertical: .lastTextBaseline)
     }
-}
 
 @available(*, unavailable)
 extension _ViewInputs: Sendable {}
-```
 
-Now format the following Swift code:
\ No newline at end of file
+@_spi(ForOnlySwiftUIOnly)
+@available(OpenSwiftUI_v6_0, *)
+open class A {}
+```