diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 416d2e37a2..ca782dd09f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -173,7 +173,7 @@ jobs:
       - name: Build and pack CLI
         run: |
           pnpm build
-          pnpm check:bundle-owner-files
+          pnpm check:bundle
           mkdir -p .tmp/node-compat
           npm pack --ignore-scripts --pack-destination .tmp/node-compat
 
diff --git a/.github/workflows/package-smoke.yml b/.github/workflows/package-smoke.yml
index 295792e5bf..35c9f60199 100644
--- a/.github/workflows/package-smoke.yml
+++ b/.github/workflows/package-smoke.yml
@@ -12,6 +12,7 @@ on:
       - 'scripts/build-xcuitest-apple.sh'
       - 'scripts/package-android-helper.sh'
       - 'scripts/package-apple-runner-source.mjs'
+      - 'scripts/check-bundle-*.ts'
       - 'scripts/patch-xcuitest-runner-icon.ts'
       - 'scripts/sync-mcp-metadata.mjs'
       - 'scripts/write-xcuitest-cache-metadata.mjs'
@@ -34,6 +35,7 @@ on:
       - 'scripts/build-xcuitest-apple.sh'
       - 'scripts/package-android-helper.sh'
       - 'scripts/package-apple-runner-source.mjs'
+      - 'scripts/check-bundle-*.ts'
       - 'scripts/patch-xcuitest-runner-icon.ts'
       - 'scripts/sync-mcp-metadata.mjs'
       - 'scripts/write-xcuitest-cache-metadata.mjs'
diff --git a/package.json b/package.json
index fc7210de4a..b767727c86 100644
--- a/package.json
+++ b/package.json
@@ -103,7 +103,7 @@
     "package:android-ime-helper:npm": "rm -rf android/ime-helper/dist && AGENT_DEVICE_ANDROID_HELPER=ime sh ./scripts/package-android-helper.sh $(node -p \"require('./package.json').version\") android/ime-helper/dist",
     "build:macos-helper": "swift build -c release --package-path apple/macos-helper",
     "build:macos-helper:clean": "swift package --package-path apple/macos-helper clean && pnpm build:macos-helper",
-    "package:npm": "pnpm build && pnpm build:xcuitest:ios && pnpm build:xcuitest:macos && pnpm build:xcuitest:tvos && pnpm build:xcuitest:visionos && pnpm build:macos-helper:clean && pnpm package:apple-runner:npm && pnpm build:android",
+    "package:npm": "pnpm build && pnpm check:bundle && pnpm build:xcuitest:ios && pnpm build:xcuitest:macos && pnpm build:xcuitest:tvos && pnpm build:xcuitest:visionos && pnpm build:macos-helper:clean && pnpm package:apple-runner:npm && pnpm build:android",
     "ad": "node bin/agent-device.mjs",
     "bench:help-conformance": "node scripts/help-conformance-bench.mjs",
     "maestro:conformance": "node --experimental-strip-types --test packages/maestro/test/conformance/verify.test.ts packages/maestro/test/conformance/differential/run.test.ts packages/maestro/test/conformance/differential/invariants.test.ts",
@@ -133,7 +133,9 @@
     "depgraph": "node --experimental-strip-types scripts/depgraph/build.ts",
     "depgraph:test": "node --experimental-strip-types --test scripts/depgraph/model.test.ts scripts/depgraph/affected.test.ts",
     "check:production-exports": "fallow dead-code --config fallow-production-exports.json --production --unused-exports --fail-on-issues",
+    "check:bundle": "pnpm check:bundle-owner-files && pnpm check:bundle-private-imports",
     "check:bundle-owner-files": "node --experimental-strip-types scripts/check-bundle-owner-files.ts",
+    "check:bundle-private-imports": "node --experimental-strip-types scripts/check-bundle-private-imports.ts",
     "check:command-docs": "vitest run --project unit-core src/__tests__/command-doc-coverage.test.ts",
     "check:replay-compat": "node --experimental-strip-types scripts/check-replay-compat-provenance.ts",
     "check:freerange": "fr",
@@ -141,7 +143,7 @@
     "sync:mcp-metadata": "node scripts/sync-mcp-metadata.mjs",
     "check:mcp-metadata": "node scripts/sync-mcp-metadata.mjs --check",
     "version": "pnpm sync:mcp-metadata && git add server.json",
-    "check:tooling": "pnpm format:check && pnpm lint && pnpm typecheck && pnpm check:layering && pnpm depgraph:test && pnpm check:production-exports && pnpm check:mcp-metadata && pnpm build && pnpm check:bundle-owner-files",
+    "check:tooling": "pnpm format:check && pnpm lint && pnpm typecheck && pnpm check:layering && pnpm depgraph:test && pnpm check:production-exports && pnpm check:mcp-metadata && pnpm build && pnpm check:bundle",
     "check:unit": "pnpm check:contention-retry && pnpm test:unit && pnpm test:smoke",
     "check": "pnpm check:tooling && pnpm check:fallow && pnpm check:unit",
     "prepack": "pnpm check:mcp-metadata && pnpm package:npm",
diff --git a/scripts/check-bundle-private-imports.ts b/scripts/check-bundle-private-imports.ts
new file mode 100644
index 0000000000..a424415029
--- /dev/null
+++ b/scripts/check-bundle-private-imports.ts
@@ -0,0 +1,65 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { runAsMain } from './lib/run-as-main.ts';
+import { walkFiles } from './lib/walk-files.ts';
+
+const PRIVATE_WORKSPACE_IMPORT_RE =
+  /(?:\bfrom\s*|\bimport\s*\(\s*|\bimport\s*|\brequire\s*\(\s*|\bimport\.meta\.resolve\s*\(\s*)(["'])(@agent-device\/[^"'\\]+)\1/g;
+
+export type BundleSource = {
+  file: string;
+  content: string;
+};
+
+export type PrivateWorkspaceImportLeak = {
+  file: string;
+  specifier: string;
+};
+
+export function findPrivateWorkspaceImportLeaks(
+  sources: readonly BundleSource[],
+): PrivateWorkspaceImportLeak[] {
+  const seen = new Set<string>();
+  const leaks: PrivateWorkspaceImportLeak[] = [];
+  for (const source of sources) {
+    for (const match of source.content.matchAll(PRIVATE_WORKSPACE_IMPORT_RE)) {
+      const specifier = match[2];
+      if (!specifier) continue;
+      const key = `${source.file}\0${specifier}`;
+      if (seen.has(key)) continue;
+      seen.add(key);
+      leaks.push({ file: source.file, specifier });
+    }
+  }
+  return leaks;
+}
+
+function run(): number {
+  const repoRoot = path.resolve(import.meta.dirname, '..');
+  const distRoot = path.join(repoRoot, 'dist', 'src');
+  const bundleFiles = walkFiles(distRoot).filter((file) => file.endsWith('.js'));
+  if (bundleFiles.length === 0) {
+    throw new Error('No dist/src JavaScript files found. Run `pnpm build` first.');
+  }
+
+  const leaks = findPrivateWorkspaceImportLeaks(
+    bundleFiles.map((file) => ({
+      file: path.relative(repoRoot, file),
+      content: fs.readFileSync(file, 'utf8'),
+    })),
+  );
+  if (leaks.length > 0) {
+    const details = leaks.map(({ file, specifier }) => `- ${specifier} in ${file}`).join('\n');
+    throw new Error(
+      `Private workspace imports leaked into production bundles:\n${details}\n` +
+        'Run `pnpm install` so workspace packages resolve, then rebuild before publishing.',
+    );
+  }
+
+  process.stdout.write(
+    `Verified ${bundleFiles.length} production bundles contain no private workspace imports.\n`,
+  );
+  return 0;
+}
+
+runAsMain(import.meta.url, 'check:bundle-private-imports', run);
diff --git a/src/__tests__/bundle-private-imports.test.ts b/src/__tests__/bundle-private-imports.test.ts
new file mode 100644
index 0000000000..a1e826867e
--- /dev/null
+++ b/src/__tests__/bundle-private-imports.test.ts
@@ -0,0 +1,42 @@
+import assert from 'node:assert/strict';
+import { test } from 'vitest';
+import { findPrivateWorkspaceImportLeaks } from '../../scripts/check-bundle-private-imports.ts';
+
+test('finds private workspace package imports left in emitted chunks', () => {
+  const leaks = findPrivateWorkspaceImportLeaks([
+    {
+      file: 'dist/src/sdk-selectors.js',
+      content: [
+        'import{x}from"@agent-device/ad-script";',
+        'const replay=import("@agent-device/ad-replay");',
+        'const duplicate=import("@agent-device/ad-script");',
+      ].join(''),
+    },
+    {
+      file: 'dist/src/daemon.js',
+      content: 'const script=require("@agent-device/ad-script/internal");',
+    },
+  ]);
+
+  assert.deepEqual(leaks, [
+    { file: 'dist/src/sdk-selectors.js', specifier: '@agent-device/ad-script' },
+    { file: 'dist/src/sdk-selectors.js', specifier: '@agent-device/ad-replay' },
+    { file: 'dist/src/daemon.js', specifier: '@agent-device/ad-script/internal' },
+  ]);
+});
+
+test('ignores bundled mentions and external runtime dependencies', () => {
+  assert.deepEqual(
+    findPrivateWorkspaceImportLeaks([
+      {
+        file: 'dist/src/cli.js',
+        content: [
+          'const diagnostic="@agent-device/ad-script";',
+          'import{stringify}from"yaml";',
+          'const scope="@agent-device-example/public";',
+        ].join(''),
+      },
+    ]),
+    [],
+  );
+});
diff --git a/src/__tests__/npm-package-scripts.test.ts b/src/__tests__/npm-package-scripts.test.ts
index 3ec791ca3e..d159f783cc 100644
--- a/src/__tests__/npm-package-scripts.test.ts
+++ b/src/__tests__/npm-package-scripts.test.ts
@@ -31,6 +31,7 @@ test('prepack builds the complete package without stopping the development daemo
   for (const input of [
     'pnpm-workspace.yaml',
     'packages/**',
+    'scripts/check-bundle-*.ts',
     'scripts/patch-xcuitest-runner-icon.ts',
     'scripts/sync-mcp-metadata.mjs',
     'scripts/write-xcuitest-cache-metadata.mjs',
@@ -58,6 +59,7 @@ test('Fallow exposes one changed-code gate and an explicit full-tree audit', ()
 test('the npm package build covers every package-owned build output', () => {
   assert.deepEqual(script('package:npm').split(' && '), [
     'pnpm build',
+    'pnpm check:bundle',
     'pnpm build:xcuitest:ios',
     'pnpm build:xcuitest:macos',
     'pnpm build:xcuitest:tvos',
@@ -66,6 +68,10 @@ test('the npm package build covers every package-owned build output', () => {
     'pnpm package:apple-runner:npm',
     'pnpm build:android',
   ]);
+  assert.deepEqual(script('check:bundle').split(' && '), [
+    'pnpm check:bundle-owner-files',
+    'pnpm check:bundle-private-imports',
+  ]);
 
   assert.deepEqual(script('build:android').split(' && '), [
     'pnpm package:android-snapshot-helper:npm',