@@ -1,11 +1,7 @@
 name: CI
 
 on:
-  push:
-    branches: [main]
-  pull_request:
   workflow_dispatch:
-  workflow_call:
 
 concurrency:
   group: ci-${{ github.workflow }}-${{ github.ref }}
 
@@ -0,0 +1,53 @@
+name: probe okb reproducible
+# Temporary: is the ok-image bundle the same file on Linux, macOS and Windows? (deleted after reading)
+on:
+  push:
+    branches: ['probe/**']
+env:
+  XLINGS_NON_INTERACTIVE: '1'
+jobs:
+  okb:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { os: ubuntu-24.04, name: linux-x64, llvm: 'false' }
+          - { os: macos-14, name: darwin-arm64, llvm: 'true' }
+          - { os: windows-2022, name: win32-x64, llvm: 'true' }
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 75
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v5
+      - uses: ./.github/actions/setup-mcpp
+        with:
+          llvm: ${{ matrix.llvm }}
+      - run: |
+          set -euo pipefail
+          mcpp pack mcpp-ide --target x86_64-openkal --pkg-format okb
+          mcpp pack mcpp-ide --target x86_64-openkal --pkg-format dir -o images
+          mkdir -p out
+          cp target/dist/mcpp-ide-0.1.0.okb out/
+          cp target/dist/images/lib/x86_64/mcpp-ide.oke out/x86_64.oke
+          cp target/dist/images/lib/aarch64/mcpp-ide.oke out/aarch64.oke
+          (cd out && sha256sum *)
+      - uses: actions/upload-artifact@v5
+        with:
+          name: probe-${{ matrix.name }}
+          path: out
+  compare:
+    needs: okb
+    if: always()
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/download-artifact@v5
+        with:
+          pattern: probe-*
+          path: p
+      - run: |
+          cd p && sha256sum */* | sort -k2 | sed 's,  , ,'
+          for f in mcpp-ide-0.1.0.okb x86_64.oke aarch64.oke; do
+            echo "$f: $(sha256sum */$f | awk '{print $1}' | sort -u | wc -l) distinct digest(s) across $(ls -d */ | wc -l) systems"
+          done