diff --git a/.github/workflows/review-translations.yml b/.github/workflows/review-translations.yml
index af37bbf..daf20db 100644
--- a/.github/workflows/review-translations.yml
+++ b/.github/workflows/review-translations.yml
@@ -45,5 +45,9 @@ jobs:
           source-language: en
           target-language: fr
           docs-folder: lectures
+          # Stage 4 shadow calibration (QuantEcon/project-translation#15): records
+          # the would-auto-merge decision in the verdict block, a run notice and an
+          # output — and acts on none of them. Routing and labels are unchanged.
+          auto-merge-mode: shadow
           anthropic-api-key: ${{ secrets.ANTHROPIC_API_KEY }}
           github-token: ${{ secrets.GITHUB_TOKEN }}