diff --git a/src/utils/computerUse/executor.ts b/src/utils/computerUse/executor.ts
index ef8ce1207..2b6c9ade1 100644
--- a/src/utils/computerUse/executor.ts
+++ b/src/utils/computerUse/executor.ts
@@ -414,7 +414,7 @@ export function createCliExecutor(opts: {
         d.height,
         d.scaleFactor,
       )
-      return drainRunLoop(() =>
+      const raw = await drainRunLoop(() =>
         cu.resolvePrepareCapture(
           withoutTerminal(opts.allowedBundleIds),
           surrogateHost,
@@ -426,6 +426,14 @@ export function createCliExecutor(opts: {
           opts.doHide,
         ),
       )
+      // Ensure the result has fields expected by toolCalls.ts (hidden, displayId).
+      // macOS native returns these from Swift; our cross-platform ComputerUseAPI
+      // returns {base64, width, height} — fill in the missing fields.
+      return {
+        ...raw,
+        hidden: (raw as any).hidden ?? [],
+        displayId: (raw as any).displayId ?? opts.preferredDisplayId ?? d.displayId,
+      }
     },
 
     /**
diff --git a/src/utils/computerUse/swiftLoader.ts b/src/utils/computerUse/swiftLoader.ts
index 5a80a83f7..0fcc23fea 100644
--- a/src/utils/computerUse/swiftLoader.ts
+++ b/src/utils/computerUse/swiftLoader.ts
@@ -13,8 +13,17 @@ let cached: ComputerUseAPI | undefined
  * these in drainRunLoop().
  */
 export function requireComputerUseSwift(): ComputerUseAPI {
+  if (cached) return cached
   // eslint-disable-next-line @typescript-eslint/no-require-imports
-  return (cached ??= require('@ant/computer-use-swift') as ComputerUseAPI)
+  const mod = require('@ant/computer-use-swift')
+  // macOS native .node exports a plain object with apps/display/screenshot directly.
+  // Our cross-platform package exports { ComputerUseAPI } class — needs instantiation.
+  if (mod.ComputerUseAPI && typeof mod.ComputerUseAPI === 'function') {
+    cached = new mod.ComputerUseAPI() as ComputerUseAPI
+  } else {
+    cached = mod as ComputerUseAPI
+  }
+  return cached
 }
 
 export type { ComputerUseAPI }