diff --git a/playbooks/README.md b/playbooks/README.md
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+++ b/playbooks/README.md
@@ -0,0 +1 @@
+Ansible playbook definitions for Zuul. See [//.zuul.yaml](../.zuul.yaml).
diff --git a/playbooks/sync-to-external-repo/pre.yaml b/playbooks/sync-to-external-repo/pre.yaml
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+++ b/playbooks/sync-to-external-repo/pre.yaml
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+- hosts: all
+  roles:
+    - role: ensure-build-essential
diff --git a/playbooks/sync-to-external-repo/run.yaml b/playbooks/sync-to-external-repo/run.yaml
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+++ b/playbooks/sync-to-external-repo/run.yaml
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+- hosts: all
+  roles:
+    - role: export-commits
diff --git a/playbooks/sync-to-external-repo/test.yaml b/playbooks/sync-to-external-repo/test.yaml
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+++ b/playbooks/sync-to-external-repo/test.yaml
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+- hosts: all
+  roles:
+    - role: validate-copybara-config