diff --git a/.changeset/review-checkout-routing.md b/.changeset/review-checkout-routing.md
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+---
+"@runfusion/fusion": patch
+---
+
+summary: Enforce explicit external checkout metadata for review routing.
+category: fix
+dev: Reviews now use sourceMetadata.externalReviewCheckout only when it points at a valid git checkout, otherwise they fail closed to the task worktree and log the selected review target.