diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..18a9972
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,29 @@
+name: ci
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+permissions:
+  contents: read
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  working-model:
+    # Working-model block sync (umbrella issue dmfdeploy/dmfdeploy#32): the
+    # agent-context block in CLAUDE.md/AGENTS.md/QWEN.md must stay byte-identical
+    # to the umbrella template; --strict fails on a missing or drifted block.
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+        with:
+          persist-credentials: false
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2 — umbrella: canonical template + checker
+        with:
+          repository: dmfdeploy/dmfdeploy
+          path: .umbrella
+          persist-credentials: false
+      - name: Working-model block sync (strict)
+        run: .umbrella/bin/check-working-model-sync.sh --repo . --strict --template .umbrella/docs/templates/working-model-block.md