Add Flutter runtime inspector support

.gitignore

@@ -9,6 +9,8 @@ packages/inspector-agent/.build/
 packages/inspector-agent/.swiftpm/
 packages/nativescript-inspector/dist/
 packages/react-native-inspector/dist/
+packages/flutter-inspector/.dart_tool/
+packages/flutter-inspector/pubspec.lock
 docs/.vitepress/dist/
 docs/.vitepress/cache/
 cloud/

AGENTS.md

@@ -51,6 +51,10 @@ The native side should own anything that depends on macOS frameworks, `xcrun sim
   React Native in-app inspector runtime that connects to the Rust server over
   WebSocket, publishes React Fiber component hierarchies with Metro source
   locations, and performs best-effort debug JS/native prop edits.
+- `packages/flutter-inspector/lib/simdeck_flutter_inspector.dart`
+  Flutter in-app inspector runtime that connects to the Rust server over
+  WebSocket, publishes widget/render/semantics hierarchies with debug creation
+  locations, and performs best-effort semantics, focus, text, and scroll actions.
 
 ## Working Rules
 
@@ -59,6 +63,7 @@ The native side should own anything that depends on macOS frameworks, `xcrun sim
 - Keep browser-only presentation logic in `client/`.
 - Keep NativeScript app runtime inspection logic in `packages/nativescript-inspector/`.
 - Keep React Native app runtime inspection logic in `packages/react-native-inspector/`.
+- Keep Flutter app runtime inspection logic in `packages/flutter-inspector/`.
 - Prefer adding a native API endpoint before adding client-only assumptions.
 - Do not add a Node or Swift dependency to solve work that already fits in Foundation/AppKit.
 - When touching private API usage, keep the adaptation small and explicit and document any simulator/runtime assumptions here.

README.md

@@ -39,7 +39,7 @@ view inside the editor.
 - Full simulator control & inspection using private accessibility APIs - available using `simdeck` CLI
 - Real-time screen `describe` command using accessibility view tree - available in token-efficient format for agents
 - CoreSimulator chrome asset rendering for device bezels
-- NativeScript, React Native, UIKit and SwiftUI runtime inspector plugins to view app's view hierarchy live
+- NativeScript, React Native, Flutter, UIKit and SwiftUI runtime inspector plugins to view app's view hierarchy live
 - `simdeck/test` for fast JS/TS app tests that can query accessibility state and drive simulator controls.
 - SimDeck Studio for sharing Simulator streams & automatic PR deployments to on-demand simulators
 
@@ -182,9 +182,10 @@ booting is unavailable.
 `stream` writes an Annex B H.264 elementary stream to stdout for diagnostics or
 external tools such as `ffplay`.
 
-`describe` uses the project daemon to prefer React Native, NativeScript, or
-UIKit in-app inspectors, then falls back to the built-in private CoreSimulator
-accessibility bridge. Use `--format agent` or `--format compact-json` for
+`describe` uses the project daemon to prefer React Native, NativeScript,
+Flutter, or UIKit in-app inspectors, then falls back to the built-in private
+CoreSimulator accessibility bridge. Use `--format agent` or
+`--format compact-json` for
 lower-token hierarchy dumps. Coordinate commands accept screen coordinates from
 the accessibility tree by default; pass `--normalized` to send `0.0..1.0`
 coordinates directly.
@@ -241,6 +242,27 @@ so the package can capture React Fiber commits. The auto entrypoint no-ops
 outside development, reads `EXPO_PUBLIC_SIMDECK_PORT` when present, and
 otherwise scans common SimDeck daemon ports.
 
+## Flutter Inspector
+
+Flutter apps can expose their widget tree, render frames, semantics metadata,
+and debug widget creation locations with the Flutter inspector package:
+
+```dart
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:simdeck_flutter_inspector/simdeck_flutter_inspector.dart';
+
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  if (kDebugMode) {
+    startSimDeckFlutterInspector(port: 4310);
+  }
+
+  runApp(const App());
+}
+```
+
 ## VS Code
 
 Install the `nativescript.simdeck-vscode` extension from the VS Code Marketplace, then

client/src/api/types.ts

@@ -164,6 +164,7 @@ export interface AccessibilityNode {
   enabled?: boolean | null;
   frame?: AccessibilityFrame | null;
   frameInScreen?: AccessibilityFrame | null;
+  flutter?: Record<string, unknown> | null;
   help?: string | null;
   imageName?: string | null;
   inspectorId?: string | null;
@@ -178,11 +179,13 @@ export interface AccessibilityNode {
   role?: string | null;
   role_description?: string | null;
   scroll?: Record<string, unknown> | null;
+  semantics?: Record<string, unknown> | null;
   source?:
     | "native-ax"
     | "in-app-inspector"
     | "nativescript"
     | "react-native"
+    | "flutter"
     | "swiftui"
     | string
     | null;
@@ -207,6 +210,7 @@ export type AccessibilitySource =
   | "in-app-inspector"
   | "nativescript"
   | "react-native"
+  | "flutter"
   | "swiftui";
 export type AccessibilitySourcePreference = AccessibilitySource | "auto";
 

client/src/app/AppShell.tsx

@@ -106,8 +106,10 @@ import {
 
 const ACCESSIBILITY_REFRESH_MS = 1500;
 const REACT_NATIVE_ACCESSIBILITY_REFRESH_MS = 500;
+const FLUTTER_ACCESSIBILITY_REFRESH_MS = 1000;
 const DEFAULT_ACCESSIBILITY_MAX_DEPTH = 10;
 const LOGICAL_INSPECTOR_MAX_DEPTH = 80;
+const FLUTTER_INSPECTOR_MAX_DEPTH = 48;
 const AUTH_REQUIRED_MESSAGE = "SimDeck API access token is required.";
 const LOCAL_STREAM_DEFAULTS: StreamConfig = {
   encoder: "auto",
@@ -913,7 +915,9 @@ export function AppShell({
           maxDepth:
             accessibilityPreferredSource === "native-ax"
               ? DEFAULT_ACCESSIBILITY_MAX_DEPTH
-              : LOGICAL_INSPECTOR_MAX_DEPTH,
+              : accessibilityPreferredSource === "flutter"
+                ? FLUTTER_INSPECTOR_MAX_DEPTH
+                : LOGICAL_INSPECTOR_MAX_DEPTH,
         },
       );
       if (accessibilityRequestIdRef.current !== requestId) {
@@ -993,7 +997,10 @@ export function AppShell({
       accessibilityPreferredSource === "react-native" ||
       accessibilitySource === "react-native"
         ? REACT_NATIVE_ACCESSIBILITY_REFRESH_MS
-        : ACCESSIBILITY_REFRESH_MS;
+        : accessibilityPreferredSource === "flutter" ||
+            accessibilitySource === "flutter"
+          ? FLUTTER_ACCESSIBILITY_REFRESH_MS
+          : ACCESSIBILITY_REFRESH_MS;
     const interval = window.setInterval(() => {
       void loadAccessibilityTree();
     }, refreshMs);

client/src/app/uiState.ts

@@ -34,6 +34,7 @@ export const TOUCH_OVERLAY_VISIBLE_STORAGE_KEY = "xcw-touch-overlay-visible";
 const ACCESSIBILITY_SOURCE_ORDER: AccessibilitySource[] = [
   "nativescript",
   "react-native",
+  "flutter",
   "swiftui",
   "in-app-inspector",
   "native-ax",
@@ -158,6 +159,7 @@ export function isAccessibilitySource(
   return (
     value === "nativescript" ||
     value === "react-native" ||
+    value === "flutter" ||
     value === "swiftui" ||
     value === "in-app-inspector" ||
     value === "native-ax"

client/src/features/accessibility/AccessibilityInspector.tsx

@@ -146,15 +146,15 @@ export function AccessibilityInspector({
 
     const tree = buildAccessibilityTree(roots);
     const storedExpandedIds =
-      source === "react-native"
+      source === "react-native" || source === "flutter"
         ? []
         : readStoredStringArray(expandedStorageKey(udid));
     setExpandedIds(
       storedExpandedIds.length > 0
         ? new Set(storedExpandedIds)
         : defaultExpandedAccessibilityIds(
             tree,
-            source === "react-native" ? 2 : 10,
+            source === "react-native" || source === "flutter" ? 2 : 10,
           ),
     );
     expandedInitializedKeyRef.current = expansionKey;
@@ -467,6 +467,7 @@ function NodeDetails({
     ["Module", node.moduleName ?? ""],
     ["NativeScript", nativeScriptDescription(node.nativeScript)],
     ["React Native", reactNativeDescription(node.reactNative)],
+    ["Flutter", flutterDescription(node.flutter)],
     ["UIKit Class", node.className ?? ""],
     ["Last JS", lastUIKitScriptText(node)],
     ["Value", node.AXValue ?? ""],
@@ -727,6 +728,7 @@ function errorMessage(error: unknown): string {
 const HIERARCHY_SOURCE_ORDER: AccessibilitySource[] = [
   "nativescript",
   "react-native",
+  "flutter",
   "swiftui",
   "in-app-inspector",
   "native-ax",
@@ -756,6 +758,9 @@ function sourceLabel(source: AccessibilitySource): string {
   if (source === "react-native") {
     return "React Native";
   }
+  if (source === "flutter") {
+    return "Flutter";
+  }
   if (source === "swiftui") {
     return "SwiftUI";
   }
@@ -795,6 +800,17 @@ function reactNativeDescription(
   return [tag, testID, nativeID].filter(Boolean).join(" / ");
 }
 
+function flutterDescription(value: Record<string, unknown> | null | undefined) {
+  if (!value) {
+    return "";
+  }
+  const widgetType =
+    typeof value.widgetType === "string" ? value.widgetType : "";
+  const stateType = typeof value.stateType === "string" ? value.stateType : "";
+  const key = typeof value.key === "string" ? value.key : "";
+  return [widgetType, stateType, key].filter(Boolean).join(" / ");
+}
+
 function lastUIKitScriptText(node: AccessibilityNode): string {
   const direct = stringRecordValue(node.uikitScript, "script");
   if (direct) {

client/src/features/accessibility/accessibilityTree.test.ts

@@ -114,6 +114,52 @@ describe("buildAccessibilityTree", () => {
     expect(tree[0].node.type).toBe("Text");
     expect(tree[0].chain.map((node) => node.type)).toEqual(["Wrap", "RCTView"]);
   });
+
+  it("compacts one-child Flutter layout wrappers but keeps app components", () => {
+    const roots: AccessibilityNode[] = [
+      {
+        source: "flutter",
+        type: "InspectorDemoHome",
+        title: "InspectorDemoHome",
+        sourceLocation: { file: "/tmp/demo/lib/main.dart" },
+        children: [
+          {
+            source: "flutter",
+            type: "Padding",
+            title: "Padding",
+            sourceLocation: { file: "/tmp/demo/lib/main.dart" },
+            flutter: { transparent: true },
+            children: [
+              {
+                source: "flutter",
+                type: "Center",
+                title: "Center",
+                sourceLocation: { file: "/tmp/demo/lib/main.dart" },
+                flutter: { transparent: true },
+                children: [
+                  {
+                    source: "flutter",
+                    type: "Text",
+                    title: "Continue",
+                    AXLabel: "Continue",
+                  },
+                ],
+              },
+            ],
+          },
+        ],
+      },
+    ];
+
+    const tree = buildAccessibilityTree(roots);
+
+    expect(tree[0].node.type).toBe("InspectorDemoHome");
+    expect(tree[0].children[0].node.type).toBe("Text");
+    expect(tree[0].children[0].chain.map((node) => node.type)).toEqual([
+      "Padding",
+      "Center",
+    ]);
+  });
 });
 
 describe("findAccessibilityItemAtPoint", () => {
@@ -247,4 +293,36 @@ describe("findAccessibilityItemAtPoint", () => {
     expect(item?.node.type).toBe("Label");
     expect(item?.id).toBe("0.0");
   });
+
+  it("ignores transparent Flutter overlays that cover selectable content", () => {
+    const roots: AccessibilityNode[] = [
+      {
+        source: "flutter",
+        type: "Stack",
+        frame: { x: 0, y: 0, width: 400, height: 800 },
+        flutter: { transparent: true },
+        children: [
+          {
+            source: "flutter",
+            type: "FilledButton",
+            title: "Continue",
+            AXLabel: "Continue",
+            frame: { x: 100, y: 300, width: 200, height: 60 },
+          },
+          {
+            source: "flutter",
+            type: "Listener",
+            title: "Listener",
+            frame: { x: 0, y: 0, width: 400, height: 800 },
+            flutter: { transparent: true },
+          },
+        ],
+      },
+    ];
+
+    const item = findAccessibilityItemAtPoint(roots, { x: 0.5, y: 0.4125 });
+
+    expect(item?.node.type).toBe("FilledButton");
+    expect(item?.id).toBe("0.0");
+  });
 });