diff --git a/Sources/SkipSyntax/Kotlin/KotlinBridgeToKotlinVisitor.swift b/Sources/SkipSyntax/Kotlin/KotlinBridgeToKotlinVisitor.swift
index 4c854378..95b6592f 100644
--- a/Sources/SkipSyntax/Kotlin/KotlinBridgeToKotlinVisitor.swift
+++ b/Sources/SkipSyntax/Kotlin/KotlinBridgeToKotlinVisitor.swift
@@ -13,6 +13,7 @@ final class KotlinBridgeToKotlinVisitor {
     private let includesUI: Bool
     private var swiftDefinitions: [SwiftDefinition] = []
     private var cdeclFunctions: [CDeclFunction] = []
+    private var needsObservationImport = false
 
     init?(for syntaxTree: KotlinSyntaxTree, options: KotlinBridgeOptions, translator: KotlinTranslator) {
         guard syntaxTree.isBridgeFile, !syntaxTree.root.isInIfSkipBlock, let codebaseInfo = translator.codebaseInfo else {
@@ -121,8 +122,12 @@ final class KotlinBridgeToKotlinVisitor {
         }
         let swiftDefinitions = self.swiftDefinitions
         let cdeclFunctions = self.cdeclFunctions
+        let needsObservationImport = self.needsObservationImport
         let outputNode = SwiftDefinition { output, indentation, _ in
             output.append("import SkipBridge\n\n")
+            if needsObservationImport, !importDeclarations.contains(where: { $0.modulePath == ["Observation"] }) {
+                output.append("import Observation\n")
+            }
             for importDeclaration in importDeclarations {
                 let path = importDeclaration.modulePath.joined(separator: ".")
                 output.append(indentation).append("import ").append(path).append("\n")
@@ -1047,6 +1052,9 @@ final class KotlinBridgeToKotlinVisitor {
         }
 
         classDeclaration.inherits = mappedInherits
+        if swiftUIType == .view {
+            classDeclaration.inherits.append(.named("skip.ui.Renderable", []))
+        }
         classDeclaration.extras = Self.bridgeExtras(classDeclaration.extras)
         if clearSuperclassCall {
             classDeclaration.superclassCall = nil
@@ -1757,10 +1765,34 @@ final class KotlinBridgeToKotlinVisitor {
     private func swiftUIBodyImplementation(_ swiftUIType: TypeSignature.SwiftUIType, for classDeclaration: KotlinClassDeclaration, visibility: Modifiers.Visibility) -> (statements: [KotlinStatement], swift: [String], cdeclFunctions: [CDeclFunction]) {
         let classType = ClassType(classDeclaration)
         let externalName = "Swift_composableBody"
-        let externalParameters = swiftUIType == .view || swiftUIType == .toolbarContent ? classType.peerExternalParameter : "\(classType.peerExternalParameter), content: skip.ui.View"
+        var externalParameters = swiftUIType == .view || swiftUIType == .toolbarContent ? classType.peerExternalParameter : "\(classType.peerExternalParameter), content: skip.ui.View"
+        externalParameters += ", onChange: () -> Unit"
         let externalArguments = swiftUIType == .view || swiftUIType == .toolbarContent ? classType.peerExternalArgument : "\(classType.peerExternalArgument), content"
         let externalSourceCode = "private external fun \(externalName)(\(externalParameters)): skip.ui.View?"
-        let functionSourceCode = "return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> \(externalName)(\(externalArguments))?.Compose(composectx) ?: skip.ui.ComposeResult.ok }"
+        let bodyFunctionSourceCode: [String]
+        let renderFunctionSourceCode: [String]?
+        if swiftUIType == .view {
+            bodyFunctionSourceCode = [
+                "return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->",
+                "    Render(composectx)",
+                "    skip.ui.ComposeResult.ok",
+                "}",
+            ]
+            renderFunctionSourceCode = [
+                "val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }",
+                "observationInvalidation.value",
+                "\(externalName)(\(externalArguments), onChange = { observationInvalidation.value += 1 })?.Compose(context)",
+            ]
+        } else {
+            bodyFunctionSourceCode = [
+                "return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->",
+                "    val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }",
+                "    observationInvalidation.value",
+                "    \(externalName)(\(externalArguments), onChange = { observationInvalidation.value += 1 })?.Compose(composectx) ?: skip.ui.ComposeResult.ok",
+                "}",
+            ]
+            renderFunctionSourceCode = nil
+        }
         let externalFunctionDeclaration = KotlinRawStatement(sourceCode: externalSourceCode)
 
         let functionDeclaration = KotlinFunctionDeclaration(name: "body")
@@ -1770,10 +1802,25 @@ final class KotlinBridgeToKotlinVisitor {
         functionDeclaration.returnType = .skipUIView
         functionDeclaration.modifiers = Modifiers(visibility: .public, isOverride: true)
         functionDeclaration.extras = .singleNewline
-        functionDeclaration.body = KotlinCodeBlock(statements: [KotlinRawStatement(sourceCode: functionSourceCode)])
+        functionDeclaration.body = KotlinCodeBlock(statements: bodyFunctionSourceCode.map { KotlinRawStatement(sourceCode: $0) })
         functionDeclaration.body?.disallowSingleStatementAppend = true
         functionDeclaration.parent = classDeclaration
 
+        let renderFunctionDeclaration: KotlinFunctionDeclaration?
+        if let renderFunctionSourceCode {
+            let declaration = KotlinFunctionDeclaration(name: "Render")
+            declaration.parameters = [Parameter<KotlinExpression>(externalLabel: "context", declaredType: .named("skip.ui.ComposeContext", []))]
+            declaration.modifiers = Modifiers(visibility: .public, isOverride: true)
+            declaration.attributes.attributes.append(Attribute(signature: .named("androidx.compose.runtime.Composable", [])))
+            declaration.extras = .singleNewline
+            declaration.body = KotlinCodeBlock(statements: renderFunctionSourceCode.map { KotlinRawStatement(sourceCode: $0) })
+            declaration.body?.disallowSingleStatementAppend = true
+            declaration.parent = classDeclaration
+            renderFunctionDeclaration = declaration
+        } else {
+            renderFunctionDeclaration = nil
+        }
+
         var swift: [String] = []
         let visibilityString = visibility.swift(suffix: " ")
         if swiftUIType == .view || swiftUIType == .toolbarContent {
@@ -1789,30 +1836,38 @@ final class KotlinBridgeToKotlinVisitor {
         if swiftUIType != .view && swiftUIType != .toolbarContent {
             cdeclParameters.append(TypeSignature.Parameter(label: "content", type: .javaObjectPointer))
         }
+        cdeclParameters.append(TypeSignature.Parameter(label: "onChange", type: .javaObjectPointer))
         let cdeclSignature: TypeSignature = .function(cdeclParameters, .optional(.javaObjectPointer), APIFlags(), nil)
         var cdeclSource = classType.peerSwiftAssignment(to: classDeclaration, optionsString: "[]")
-        let bodyInvocation: String
+        let bodyExpression: String
         if swiftUIType == .view || swiftUIType == .toolbarContent {
             if classType == .generic {
-                bodyInvocation = "let body = \(classType.peerSwiftTarget).body()"
+                bodyExpression = "\(classType.peerSwiftTarget).body()"
             } else {
-                bodyInvocation = "let body = \(classType.peerSwiftTarget).body"
+                bodyExpression = "\(classType.peerSwiftTarget).body"
             }
         } else {
             cdeclSource.append("let content_swift = JavaBackedView(content)!")
             if classType == .generic {
-                bodyInvocation = "let body = \(classType.peerSwiftTarget).body(content_swift)"
+                bodyExpression = "\(classType.peerSwiftTarget).body(content_swift)"
             } else {
-                bodyInvocation = "let body = \(classType.peerSwiftTarget).body(content: content_swift)"
+                bodyExpression = "\(classType.peerSwiftTarget).body(content: content_swift)"
             }
         }
+        needsObservationImport = true
+        cdeclSource.append("let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void")
         cdeclSource.append("return SkipBridge.assumeMainActorUnchecked {")
-        cdeclSource.append(1, bodyInvocation)
+        cdeclSource.append(1, "let body = withObservationTracking {")
+        cdeclSource.append(2, "return \(bodyExpression)")
+        cdeclSource.append(1, "} onChange: {")
+        cdeclSource.append(2, "onChange_swift()")
+        cdeclSource.append(1, "}")
         cdeclSource.append(1, "return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])")
         cdeclSource.append("}")
         let cdeclFunction = CDeclFunction(name: cdeclName, cdecl: cdecl, signature: cdeclSignature, body: cdeclSource)
 
-        return ([functionDeclaration, externalFunctionDeclaration], swift, [cdeclFunction])
+        let declarations = [functionDeclaration] + (renderFunctionDeclaration.map { [$0] } ?? []) + [externalFunctionDeclaration]
+        return (declarations, swift, [cdeclFunction])
     }
 }
 
diff --git a/Tests/SkipSyntaxTests/BridgeToKotlinTests.swift b/Tests/SkipSyntaxTests/BridgeToKotlinTests.swift
index c5167ed1..7bde97f2 100644
--- a/Tests/SkipSyntaxTests/BridgeToKotlinTests.swift
+++ b/Tests/SkipSyntaxTests/BridgeToKotlinTests.swift
@@ -7296,7 +7296,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -7319,9 +7319,19 @@ final class BridgeToKotlinTests: XCTestCase {
             override fun hashCode(): Int = Swift_peer.hashCode()
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             val i: Int
                 get() = Swift_i(Swift_peer)
@@ -7339,6 +7349,7 @@ final class BridgeToKotlinTests: XCTestCase {
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -7383,10 +7394,15 @@ final class BridgeToKotlinTests: XCTestCase {
             return SwiftClosure0.javaObject(for: factory, options: [])!
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -7409,7 +7425,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -7441,15 +7457,26 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_count(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.StateSupport)
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -7502,10 +7529,15 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -7553,7 +7585,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        internal class V<T>: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V<T>: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -7585,15 +7617,26 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_t(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.StateSupport)
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static var Java_class: JClass { try! JClass(name: "V") }
@@ -7666,10 +7709,15 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: V_TypeErased = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.body()
+                let body = withObservationTracking {
+                    return peer_swift.body()
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -7686,7 +7734,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -7718,15 +7766,26 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_i(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.StateSupport)
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
+            }
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -7779,10 +7838,15 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -7802,14 +7866,24 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        enum class E: skip.ui.View, skip.lib.SwiftProjecting {
+        enum class E: skip.ui.View, skip.ui.Renderable, skip.lib.SwiftProjecting {
 
             a;
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(name)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(name, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(name: String): skip.ui.View?
+            private external fun Swift_composableBody(name: String, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
@@ -7819,6 +7893,7 @@ final class BridgeToKotlinTests: XCTestCase {
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipSwiftUI
         extension E: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "E")
@@ -7853,11 +7928,16 @@ final class BridgeToKotlinTests: XCTestCase {
             return SwiftClosure0.javaObject(for: factory, options: [])!
         }
         @_cdecl("Java_E_Swift_1composableBody")
-        public func E_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ name: JavaString) -> JavaObjectPointer? {
+        public func E_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ name: JavaString, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let name_swift = String.fromJavaObject(name, options: [])
             let peer_swift = E.fromJavaName(name_swift)
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.body
+                let body = withObservationTracking {
+                    return peer_swift.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -7877,7 +7957,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        sealed class E<out T>: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        sealed class E<out T>: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
 
             class ACase<T>(val associated0: T): E<T>() {
             }
@@ -7899,9 +7979,19 @@ final class BridgeToKotlinTests: XCTestCase {
             override fun hashCode(): Int = Swift_peer.hashCode()
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
@@ -7912,6 +8002,7 @@ final class BridgeToKotlinTests: XCTestCase {
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipSwiftUI
         extension E: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static var Java_class: JClass { try! JClass(name: "E") }
@@ -7966,10 +8057,15 @@ final class BridgeToKotlinTests: XCTestCase {
             return SwiftClosure0.javaObject(for: factory, options: [])!
         }
         @_cdecl("Java_E_Swift_1composableBody")
-        public func E_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func E_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: E_TypeErased = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.body()
+                let body = withObservationTracking {
+                    return peer_swift.body()
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -7986,7 +8082,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -8018,15 +8114,26 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_focused(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.StateSupport)
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -8079,10 +8186,15 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -8099,7 +8211,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -8131,15 +8243,26 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_i(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.StateSupport)
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
+            }
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -8192,10 +8315,15 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -8212,7 +8340,7 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         """, kotlin: """
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -8244,15 +8372,26 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_value(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.AppStorageSupport)
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -8305,10 +8444,15 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -8369,14 +8513,18 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_count(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.StateSupport)
 
             override fun body(content: skip.ui.View): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer, content)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                    observationInvalidation.value
+                    Swift_composableBody(Swift_peer, content, onChange = { observationInvalidation.value += 1 })?.Compose(composectx) ?: skip.ui.ComposeResult.ok
+                }
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, content: skip.ui.View): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, content: skip.ui.View, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -8399,15 +8547,26 @@ final class BridgeToKotlinTests: XCTestCase {
             override fun hashCode(): Int = Swift_peer.hashCode()
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension VM: BridgedToKotlin, SkipUI.ViewModifier {
             nonisolated private static let Java_class = try! JClass(name: "VM")
@@ -8477,11 +8636,16 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_VM_Swift_1composableBody")
-        public func VM_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ content: JavaObjectPointer) -> JavaObjectPointer? {
+        public func VM_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ content: JavaObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<VM> = Swift_peer.pointee()!
             let content_swift = JavaBackedView(content)!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body(content: content_swift)
+                let body = withObservationTracking {
+                    return peer_swift.value.body(content: content_swift)
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -8496,10 +8660,15 @@ final class BridgeToKotlinTests: XCTestCase {
             return SwiftClosure0.javaObject(for: factory, options: [])!
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -8548,15 +8717,20 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_syncState_count(Swift_peer: skip.bridge.SwiftObjectPointer, support: skip.ui.StateSupport)
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                    observationInvalidation.value
+                    Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(composectx) ?: skip.ui.ComposeResult.ok
+                }
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension T: BridgedToKotlin, SkipUIBridging, SkipUI.ToolbarContent {
             nonisolated private static let Java_class = try! JClass(name: "T")
@@ -8609,10 +8783,15 @@ final class BridgeToKotlinTests: XCTestCase {
             }
         }
         @_cdecl("Java_T_Swift_1composableBody")
-        public func T_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func T_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<T> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -8826,7 +9005,7 @@ final class BridgeToKotlinTests: XCTestCase {
         """, kotlin: """
         import androidx.compose.runtime.Composable
 
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -8849,9 +9028,19 @@ final class BridgeToKotlinTests: XCTestCase {
             override fun hashCode(): Int = Swift_peer.hashCode()
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
+            }
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
@@ -8870,6 +9059,7 @@ final class BridgeToKotlinTests: XCTestCase {
             private external fun Swift_projectionImpl(options: Int): () -> Any
         }
         """, swiftBridgeSupport: """
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -8899,10 +9089,15 @@ final class BridgeToKotlinTests: XCTestCase {
             return SwiftClosure0.javaObject(for: factory, options: [])!
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }
@@ -8977,7 +9172,7 @@ final class BridgeToKotlinTests: XCTestCase {
         import androidx.compose.runtime.saveable.rememberSaveable
         import androidx.compose.runtime.setValue
 
-        internal class V: skip.ui.View, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
+        internal class V: skip.ui.View, skip.ui.Renderable, skip.bridge.SwiftPeerBridged, skip.lib.SwiftProjecting {
             var Swift_peer: skip.bridge.SwiftObjectPointer = skip.bridge.SwiftObjectNil
 
             constructor(Swift_peer: skip.bridge.SwiftObjectPointer, marker: skip.bridge.SwiftPeerMarker?) {
@@ -9000,9 +9195,19 @@ final class BridgeToKotlinTests: XCTestCase {
             override fun hashCode(): Int = Swift_peer.hashCode()
 
             override fun body(): skip.ui.View {
-                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext -> Swift_composableBody(Swift_peer)?.Compose(composectx) ?: skip.ui.ComposeResult.ok }
+                return skip.ui.ComposeBuilder { composectx: skip.ui.ComposeContext ->
+                    Render(composectx)
+                    skip.ui.ComposeResult.ok
+                }
             }
-            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer): skip.ui.View?
+
+            @androidx.compose.runtime.Composable
+            override fun Render(context: skip.ui.ComposeContext) {
+                val observationInvalidation = androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(0) }
+                observationInvalidation.value
+                Swift_composableBody(Swift_peer, onChange = { observationInvalidation.value += 1 })?.Compose(context)
+            }
+            private external fun Swift_composableBody(Swift_peer: skip.bridge.SwiftObjectPointer, onChange: () -> Unit): skip.ui.View?
 
             override fun Swift_projection(options: Int): () -> Any = Swift_projectionImpl(options)
             private external fun Swift_projectionImpl(options: Int): () -> Any
@@ -9037,6 +9242,7 @@ final class BridgeToKotlinTests: XCTestCase {
         }
         """, swiftBridgeSupport: """
 
+        import Observation
         import SkipFuseUI
         extension V: BridgedToKotlin, SkipUIBridging, SkipUI.View {
             nonisolated private static let Java_class = try! JClass(name: "V")
@@ -9066,10 +9272,15 @@ final class BridgeToKotlinTests: XCTestCase {
             return SwiftClosure0.javaObject(for: factory, options: [])!
         }
         @_cdecl("Java_V_Swift_1composableBody")
-        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer) -> JavaObjectPointer? {
+        public func V_Swift_composableBody(_ Java_env: JNIEnvPointer, _ Java_target: JavaObjectPointer, _ Swift_peer: SwiftObjectPointer, _ onChange: JavaObjectPointer) -> JavaObjectPointer? {
             let peer_swift: SwiftValueTypeBox<V> = Swift_peer.pointee()!
+            let onChange_swift = SwiftClosure0.closure(forJavaObject: onChange, options: [])! as @Sendable () -> Void
             return SkipBridge.assumeMainActorUnchecked {
-                let body = peer_swift.value.body
+                let body = withObservationTracking {
+                    return peer_swift.value.body
+                } onChange: {
+                    onChange_swift()
+                }
                 return ((body as? SkipUIBridging)?.Java_view as? JConvertible)?.toJavaObject(options: [])
             }
         }