diff --git a/scripts/source/files/generate_function_manifest.sh b/scripts/source/files/generate_function_manifest.sh
index 3c1eb44..8ec7fec 100644
--- a/scripts/source/files/generate_function_manifest.sh
+++ b/scripts/source/files/generate_function_manifest.sh
@@ -305,6 +305,27 @@ isSuccessful "Wrote $(realpath --relative-to="$SCRIPTS_DIR" "$OUTPUT")"
 isNotice    "Scanned $total_files files, indexed $total_fns function definitions"
 isNotice    "${#eager_files[@]} files flagged eager (will always source)"
 
+# Untracked sources: warn before the manifest goes anywhere.
+#
+# The scan indexes what is on disk, which is correct. The hazard is committing
+# the result: an entry for a file git does not have installs a stub on every
+# other clone, and the first call to it unsets the stub, fails to source a file
+# that is not there, and dies with "command not found". Easy to cause without
+# noticing — several people working in one tree means someone else's in-progress
+# file is sitting in scripts/ whenever you happen to regenerate.
+#
+# Just a warning: the scan is right to index them, and mid-work is a perfectly
+# normal state for the tree to be in. What is not fine is committing it.
+if command -v git >/dev/null 2>&1 && git -C "$SCRIPTS_DIR" rev-parse --git-dir >/dev/null 2>&1; then
+    _untracked=$(git -C "$SCRIPTS_DIR" ls-files --others --exclude-standard -- '*.sh' 2>/dev/null)
+    if [[ -n "$_untracked" ]]; then
+        isNotice "Indexed files git does not track yet:"
+        printf '    %s\n' $_untracked
+        isNotice "  Commit them with this manifest, or drop their entries before committing —"
+        isNotice "  an entry for a file others do not have breaks on first call."
+    fi
+fi
+
 # Collisions: report so they can be audited. The manifest reflects last-write-
 # wins, which matches the existing eager-load semantics, so behaviour is
 # identical — the warnings are about *avoidable* fragility, not bugs.