diff --git a/medarc_rl/slurm_templates/one_node_rl.j2 b/medarc_rl/slurm_templates/one_node_rl.j2
index da06df9..2c34f48 100644
--- a/medarc_rl/slurm_templates/one_node_rl.j2
+++ b/medarc_rl/slurm_templates/one_node_rl.j2
@@ -35,6 +35,18 @@ export HF_HUB_OFFLINE={{ 1 if hf_hub_offline else 0 }}
 export HF_HOME="$HF_CACHE_DIR"
 export MEDARC_SINGLE_GPU={{ 1 if single_gpu else 0 }}
 
+_d="$HF_CACHE_DIR"; while [ ! -e "$_d" ]; do _d="$(dirname "$_d")"; done
+HF_CACHE_GROUP="$(stat -c '%G' "$_d")"; unset _d
+
+if ! id -Gn | grep -qw "$HF_CACHE_GROUP"; then
+  echo "ERROR: user is not a member of group $HF_CACHE_GROUP (required by $HF_CACHE_DIR)" >&2
+  exit 1
+fi
+
+if [ "$(id -gn)" != "$HF_CACHE_GROUP" ]; then
+  exec sg "$HF_CACHE_GROUP" "$0" "$@"
+fi
+
 mkdir -p "$OUTPUT_DIR/slurm" "$OUTPUT_DIR/torchrun"
 
 if [ -f "$PROJECT_DIR/.env" ]; then
diff --git a/medarc_rl/slurm_templates/one_node_sft.j2 b/medarc_rl/slurm_templates/one_node_sft.j2
index 9a960ac..2d52855 100644
--- a/medarc_rl/slurm_templates/one_node_sft.j2
+++ b/medarc_rl/slurm_templates/one_node_sft.j2
@@ -34,6 +34,18 @@ export HF_CACHE_DIR="{{ hf_cache_dir }}"
 export HF_HUB_OFFLINE={{ 1 if hf_hub_offline else 0 }}
 export HF_HOME="$HF_CACHE_DIR"
 
+_d="$HF_CACHE_DIR"; while [ ! -e "$_d" ]; do _d="$(dirname "$_d")"; done
+HF_CACHE_GROUP="$(stat -c '%G' "$_d")"; unset _d
+
+if ! id -Gn | grep -qw "$HF_CACHE_GROUP"; then
+  echo "ERROR: user is not a member of group $HF_CACHE_GROUP (required by $HF_CACHE_DIR)" >&2
+  exit 1
+fi
+
+if [ "$(id -gn)" != "$HF_CACHE_GROUP" ]; then
+  exec sg "$HF_CACHE_GROUP" "$0" "$@"
+fi
+
 mkdir -p "$OUTPUT_DIR/slurm" "$OUTPUT_DIR/torchrun"
 
 if [ -f "$PROJECT_DIR/.env" ]; then