diff --git a/.github/workflows/sync-cloud-run-env.yml b/.github/workflows/sync-cloud-run-env.yml
index 07a7e3d..736c04b 100644
--- a/.github/workflows/sync-cloud-run-env.yml
+++ b/.github/workflows/sync-cloud-run-env.yml
@@ -1258,9 +1258,11 @@ jobs:
                 --http-method=POST \
                 --oidc-service-account-email="${GCP_SCHEDULER_SERVICE_ACCOUNT}" \
                 --oidc-token-audience="${service_url}" \
-                --attempt-deadline=120s \
-                --max-retry-attempts=0 \
-                --max-retry-duration=0s \
+                --attempt-deadline=180s \
+                --max-retry-attempts=3 \
+                --min-backoff=120s \
+                --max-backoff=300s \
+                --max-retry-duration=900s \
                 --quiet
             else
               echo "Creating Cloud Scheduler precheck ${precheck_job_name} at ${desired_precheck_schedule}."
@@ -1273,9 +1275,11 @@ jobs:
                 --http-method=POST \
                 --oidc-service-account-email="${GCP_SCHEDULER_SERVICE_ACCOUNT}" \
                 --oidc-token-audience="${service_url}" \
-                --attempt-deadline=120s \
-                --max-retry-attempts=0 \
-                --max-retry-duration=0s \
+                --attempt-deadline=180s \
+                --max-retry-attempts=3 \
+                --min-backoff=120s \
+                --max-backoff=300s \
+                --max-retry-duration=900s \
                 --quiet
             fi
             managed_scheduler_jobs=("${job_name}" "${warmup_job_name}" "${precheck_job_name}")
diff --git a/tests/test_scheduler_deadline_contract.py b/tests/test_scheduler_deadline_contract.py
index c02b733..0095648 100644
--- a/tests/test_scheduler_deadline_contract.py
+++ b/tests/test_scheduler_deadline_contract.py
@@ -50,9 +50,12 @@ def test_precheck_uses_per_service_scheduler_with_bounded_deadline() -> None:
 
     assert 'precheck_job_name="${cloud_run_service%-service}-precheck-scheduler"' in workflow
     assert 'precheck_uri="${service_url}/dry-run"' in workflow
-    assert workflow.count("--attempt-deadline=120s") == 2
-    assert workflow.count("--max-retry-attempts=0") == 2
-    assert workflow.count("--max-retry-duration=0s") == 2
+    assert workflow.count("--attempt-deadline=180s") == 2
+    assert workflow.count("--max-retry-attempts=3") == 2
+    assert workflow.count("--min-backoff=120s") == 2
+    assert workflow.count("--max-backoff=300s") == 2
+    assert workflow.count("--max-retry-duration=900s") == 2
+    assert workflow.count("--max-retry-attempts=0") == 0
     assert 'managed_scheduler_jobs=("${job_name}" "${warmup_job_name}" "${precheck_job_name}")' in workflow
     assert 'monitor_job_name="interactive-brokers-monitor-dispatcher-scheduler"' not in workflow
     assert 'shared_env_pairs+=("IBKR_MONITOR_DISPATCH_TARGETS_JSON=' not in workflow
diff --git a/tests/test_sync_cloud_run_env_workflow.sh b/tests/test_sync_cloud_run_env_workflow.sh
index a5b9d8d..9d4faf5 100644
--- a/tests/test_sync_cloud_run_env_workflow.sh
+++ b/tests/test_sync_cloud_run_env_workflow.sh
@@ -180,9 +180,14 @@ grep -Fq 'precheck_job_name="${cloud_run_service%-service}-precheck-scheduler"'
 grep -Fq 'precheck_uri="${service_url}/dry-run"' "$workflow_file"
 grep -Fq 'gcloud scheduler jobs update http "${precheck_job_name}"' "$workflow_file"
 grep -Fq 'gcloud scheduler jobs create http "${precheck_job_name}"' "$workflow_file"
-test "$(grep -Fc -- '--attempt-deadline=120s' "$workflow_file")" -eq 2
-test "$(grep -Fc -- '--max-retry-attempts=0' "$workflow_file")" -eq 2
-test "$(grep -Fc -- '--max-retry-duration=0s' "$workflow_file")" -eq 2
+# Precheck may collide with other dry-runs on maxScale=1; retry transient 429s.
+# Keep /run without these retries to avoid duplicate live submits.
+test "$(grep -Fc -- '--attempt-deadline=180s' "$workflow_file")" -eq 2
+test "$(grep -Fc -- '--max-retry-attempts=3' "$workflow_file")" -eq 2
+test "$(grep -Fc -- '--min-backoff=120s' "$workflow_file")" -eq 2
+test "$(grep -Fc -- '--max-backoff=300s' "$workflow_file")" -eq 2
+test "$(grep -Fc -- '--max-retry-duration=900s' "$workflow_file")" -eq 2
+test "$(grep -Fc -- '--max-retry-attempts=0' "$workflow_file")" -eq 0
 grep -Fq 'managed_scheduler_jobs=("${job_name}" "${warmup_job_name}" "${precheck_job_name}")' "$workflow_file"
 grep -Fq 'for managed_job_name in "${managed_scheduler_jobs[@]}"; do' "$workflow_file"
 grep -Fq 'gcloud scheduler jobs resume "${managed_job_name}"' "$workflow_file"