diff --git a/.gitignore b/.gitignore
index 0d7e2ec..d6df0f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 # Dokku setup (may contain secrets)
 dokku-setup.sh
 /output/
+.claude/worktrees
diff --git a/scripts/strip-coauthor.sh b/scripts/strip-coauthor.sh
new file mode 100755
index 0000000..086d845
--- /dev/null
+++ b/scripts/strip-coauthor.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# Strip Co-Authored-By trailer lines from unpushed commits
+#
+# Usage: ./scripts/strip-coauthor.sh [base-ref]
+#   base-ref defaults to origin/main
+
+set -euo pipefail
+
+BASE="${1:-origin/main}"
+
+count=$(git log --grep="Co-Authored-By" --oneline "$BASE..HEAD" | wc -l)
+if [ "$count" -eq 0 ]; then
+  echo "No commits with Co-Authored-By found in $BASE..HEAD"
+  exit 0
+fi
+
+echo "Rewriting $count commit(s) to strip Co-Authored-By lines..."
+
+git filter-branch -f --msg-filter '
+  sed "/^Co-Authored-By:.*$/d" | sed -e :a -e "/^\n*$/{$d;N;ba;}"
+' "$BASE..HEAD"
+
+remaining=$(git log --grep="Co-Authored-By" --oneline "$BASE..HEAD" | wc -l)
+if [ "$remaining" -eq 0 ]; then
+  echo "Done. All Co-Authored-By lines removed."
+else
+  echo "WARNING: $remaining commit(s) still contain Co-Authored-By lines."
+  exit 1
+fi