diff --git a/cpp/scripts/check_tested.sh b/cpp/scripts/check_tested.sh
new file mode 100755
index 00000000..3c7fe3c8
--- /dev/null
+++ b/cpp/scripts/check_tested.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# CI gate (issue 0048): falla si una funcion C++ creada en los ultimos N dias
+# no tiene `tested: true` en su frontmatter del .md.
+#
+# Uso:
+#   cpp/scripts/check_tested.sh [days]   # default: 30
+#
+# Requiere que registry.db este actualizada (corre `fn index` antes).
+set -euo pipefail
+DAYS="${1:-30}"
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+DB="$ROOT/registry.db"
+if [ ! -f "$DB" ]; then
+    echo "WARN: registry.db not found at $DB; run 'fn index' first."
+    exit 0
+fi
+
+UNTESTED=$(sqlite3 "$DB" \
+  "SELECT id FROM functions WHERE lang='cpp' AND tested=0 \
+   AND (created_at IS NULL OR created_at > datetime('now','-${DAYS} days'));")
+if [ -n "$UNTESTED" ]; then
+    echo "FAIL: las siguientes funciones C++ recientes no tienen tested:true en .md:"
+    echo "$UNTESTED"
+    echo ""
+    echo "Anade un test (cpp/tests/test_<name>.cpp) y marca el frontmatter del .md con tested:true."
+    exit 1
+fi
+echo "OK: todas las funciones C++ recientes (<= ${DAYS}d) tienen tests."
diff --git a/cpp/scripts/run_tests.sh b/cpp/scripts/run_tests.sh
index b2f269d4..7cd6bea8 100755
--- a/cpp/scripts/run_tests.sh
+++ b/cpp/scripts/run_tests.sh
@@ -5,3 +5,7 @@ ROOT="$(cd "$(dirname "$0")/.." && pwd)"
 cmake -S "$ROOT" -B "$ROOT/build" -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=ON
 cmake --build "$ROOT/build" -j"$(nproc)"
 ctest --test-dir "$ROOT/build" --output-on-failure
+
+# CI gate (issue 0048): toda funcion C++ creada en los ultimos 30 dias debe
+# tener tested:true en el .md. No-op si no hay registry.db.
+"$ROOT/scripts/check_tested.sh" 30
diff --git a/cpp/scripts/update_goldens.sh b/cpp/scripts/update_goldens.sh
new file mode 100755
index 00000000..03b3a147
--- /dev/null
+++ b/cpp/scripts/update_goldens.sh
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Regenera los golden screenshots para el test visual (issue 0048).
+#
+# Uso:
+#   cpp/scripts/update_goldens.sh
+#
+# Compila primitives_gallery, lo lanza con --capture sobre cpp/tests/golden/,
+# y deja PNG por demo. Use LIBGL_ALWAYS_SOFTWARE=1 si no hay GPU/driver.
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cmake -S "$ROOT" -B "$ROOT/build" -DCMAKE_BUILD_TYPE=Release
+cmake --build "$ROOT/build" --target primitives_gallery -j"$(nproc)"
+mkdir -p "$ROOT/tests/golden"
+LIBGL_ALWAYS_SOFTWARE=1 \
+    "$ROOT/build/apps/primitives_gallery/primitives_gallery" \
+    --capture "$ROOT/tests/golden"
+echo "Goldens regenerated: $ROOT/tests/golden/"