diff --git a/.github/workflows/notify-platform.yml b/.github/workflows/notify-platform.yml
new file mode 100644
index 0000000..5f128db
--- /dev/null
+++ b/.github/workflows/notify-platform.yml
@@ -0,0 +1,28 @@
+name: Notify Platform Monorepo
+
+on:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  dispatch:
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    steps:
+      - name: Dispatch sync to platform
+        env:
+          GH_TOKEN: ${{ secrets.ADMIN_CONTROL_PLANE_SYNC_TOKEN || secrets.GH_BOT_TOKEN || secrets.PAT }}
+        run: |
+          if [[ -z "${GH_TOKEN}" ]]; then
+            echo "::error::No cross-repo token configured. Set ADMIN_CONTROL_PLANE_SYNC_TOKEN, GH_BOT_TOKEN, or PAT in repo secrets."
+            exit 1
+          fi
+          service="${GITHUB_REPOSITORY#*/}"
+          gh api repos/evalops/platform/dispatches \
+            -X POST \
+            -f event_type="upstream-service-push" \
+            -f "client_payload[service]=${service}" \
+            -f "client_payload[source_sha]=${GITHUB_SHA}" \
+            -f "client_payload[source_ref]=${GITHUB_REF_NAME}"