diff --git a/infra/k8s/argo/alpha-rl-template.yaml b/infra/k8s/argo/alpha-rl-template.yaml
index 7c868aad4..3c61f315c 100644
--- a/infra/k8s/argo/alpha-rl-template.yaml
+++ b/infra/k8s/argo/alpha-rl-template.yaml
@@ -373,7 +373,11 @@ spec:
             BIN="/data/bin/$SHA/alpha_rl_train"
             MBP10_DIR="/data/futures-baseline-mbp10/ES.FUT"
             PREDECODED_DIR="/feature-cache/predecoded"
-            OUT_DIR="/feature-cache/alpha-rl-runs/$SHA"
+            # Per-fold output dir so concurrent multi-fold G8 submissions
+            # don't clobber each other's eval_summary.json. Single-fold
+            # smokes (n_folds=1) still land under the SHA dir directly
+            # since fold_idx=0 → suffix "fold0".
+            OUT_DIR="/feature-cache/alpha-rl-runs/$SHA/fold{{workflow.parameters.fold-idx}}"
             mkdir -p "$OUT_DIR" "$PREDECODED_DIR"
 
             if [ ! -x "$BIN" ]; then