diff --git a/.github/workflows/build-and-publish.yml b/.github/workflows/build-and-publish.yml
index 572022e4c8..f87650f0fe 100644
--- a/.github/workflows/build-and-publish.yml
+++ b/.github/workflows/build-and-publish.yml
@@ -41,16 +41,6 @@ jobs:
       - name: 'Bundle'
         run: 'npm run bundle'
 
-      - name: 'Check Bundle Size'
-        if: "${{github.event_name == 'pull_request'}}"
-        uses: 'preactjs/compressed-size-action@946a292cd35bd1088e0d7eb92b69d1a8d5b5d76a'
-        with:
-          repo-token: '${{ secrets.GITHUB_TOKEN }}'
-          pattern: './bundle/**/*.{js,sb}'
-          minimum-change-threshold: '1000'
-          compression: 'none'
-          clean-script: 'clean'
-
       - name: 'Prepare for GitHub release'
         run: 'node scripts/prepare-github-release.js'
 
diff --git a/.github/workflows/bundle-size.yml b/.github/workflows/bundle-size.yml
new file mode 100644
index 0000000000..4f7f6ea256
--- /dev/null
+++ b/.github/workflows/bundle-size.yml
@@ -0,0 +1,47 @@
+# .github/workflows/bundle-size.yml
+name: 'Bundle Size Check'
+
+on:
+  workflow_call:
+    inputs:
+      version:
+        description: 'The version of the published package'
+        required: true
+        type: 'string'
+
+permissions:
+  contents: 'read'
+  pull-requests: 'write'
+
+jobs:
+  bundle-size:
+    name: 'Check Bundle Size'
+    runs-on: 'ubuntu-latest'
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8' # ratchet:actions/checkout@v5
+        with:
+          ref: '${{ github.event.inputs.branch_ref || github.ref }}'
+
+      - name: 'Set up Node.js'
+        uses: 'actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020' # ratchet:actions/setup-node@v4
+        with:
+          node-version-file: '.nvmrc'
+          cache: 'npm'
+
+      - name: 'Configure npm for GitHub Packages'
+        run: |
+          echo "@google-gemini:registry=https://npm.pkg.github.com/" > .npmrc
+          echo "//npm.pkg.github.com/:_authToken=${{ secrets.GITHUB_TOKEN }}" >> .npmrc
+
+      - name: 'Install dependencies'
+        run: 'npm install @google-gemini/gemini-cli@${{ inputs.version }}'
+
+      - name: 'Check Bundle Size'
+        uses: 'preactjs/compressed-size-action@946a292cd35bd1088e0d7eb92b69d1a8d5b5d76a'
+        with:
+          repo-token: '${{ secrets.GITHUB_TOKEN }}'
+          pattern: './bundle/**/*.{js,sb}'
+          minimum-change-threshold: '1000'
+          compression: 'none'
+          clean-script: 'clean'
diff --git a/.github/workflows/orchestrator.yml b/.github/workflows/orchestrator.yml
index 013685f316..ec9c87668a 100644
--- a/.github/workflows/orchestrator.yml
+++ b/.github/workflows/orchestrator.yml
@@ -45,3 +45,10 @@ jobs:
     uses: './.github/workflows/e2e.yml'
     with:
       version: '${{ needs.build-and-publish.outputs.version }}'
+
+  bundle-size:
+    name: 'Bundle Size Check'
+    needs: 'build-and-publish'
+    uses: './.github/workflows/bundle-size.yml'
+    with:
+      version: '${{ needs.build-and-publish.outputs.version }}'