diff --git a/.github/workflows/rust-clippy-diagnostic.yml b/.github/workflows/rust-clippy-diagnostic.yml
new file mode 100644
index 0000000..d1ea435
--- /dev/null
+++ b/.github/workflows/rust-clippy-diagnostic.yml
@@ -0,0 +1,40 @@
+name: Rust clippy diagnostic
+
+on:
+  push:
+    branches:
+      - codex/rust-professionalization
+  workflow_dispatch:
+
+jobs:
+  detmir-portal-clippy-diagnostic:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust 1.85 with rustfmt and clippy
+        run: |
+          rustup toolchain install 1.85.0 --profile minimal --component rustfmt --component clippy
+          rustup default 1.85.0
+
+      - name: Capture detmir-portal clippy output
+        working-directory: adk-rust
+        run: |
+          set +e
+          cargo clippy -p detmir-portal --all-targets -- -D warnings > ../detmir-portal-clippy.log 2>&1
+          status=$?
+          echo "clippy_exit_status=${status}" > ../detmir-portal-clippy-status.txt
+          tail -n 240 ../detmir-portal-clippy.log
+          exit ${status}
+
+      - name: Upload detmir-portal clippy log
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: detmir-portal-clippy-log
+          path: |
+            detmir-portal-clippy.log
+            detmir-portal-clippy-status.txt