diff --git a/run_onchange_after_install_main_deps.sh.tmpl b/run_onchange_after_install_main_deps.sh.tmpl
index b709648..5790f82 100644
--- a/run_onchange_after_install_main_deps.sh.tmpl
+++ b/run_onchange_after_install_main_deps.sh.tmpl
@@ -63,6 +63,11 @@ while [ $# -gt 0 ]; do
   shift
 done
 
+# Auto-detect non-interactive mode when no real terminal is present
+if [ ! -t 0 ] || [ ! -t 1 ]; then
+  NON_INTERACTIVE=1
+fi
+
 # Timeout portability (macOS has gtimeout via coreutils, not timeout)
 TIMEOUT_BIN="$(command -v timeout || command -v gtimeout || true)"