diff --git a/scripts/ops/prune_cf_e2e_dns.sh b/scripts/ops/prune_cf_e2e_dns.sh
index 309387c64..36f2a83fa 100755
--- a/scripts/ops/prune_cf_e2e_dns.sh
+++ b/scripts/ops/prune_cf_e2e_dns.sh
@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
 # prune_cf_e2e_dns.sh — targeted, fail-closed cleanup of disposable E2E DNS
-# records that accumulate under the moleculesai.app zone and exhaust the
-# Cloudflare DNS record quota (code 81045).
+# records that accumulate under the moleculesai.app zone (typically the
+# staging.moleculesai.app subdomain) and exhaust the Cloudflare DNS record
+# quota (code 81045).
 #
 # Why this exists: staging E2E harnesses create DNS records for slugs like
 # e2e-smoke-<date>-<run>-<uuid> and e2e-tmpl-<rand> (see
@@ -16,6 +17,8 @@
 #   - Records whose full name matches
 #       e2e-smoke-*.<zone-domain>
 #       e2e-tmpl-*.<zone-domain>
+#   - Multiple zone domains may be supplied as a comma-separated list
+#     (e.g. "moleculesai.app,staging.moleculesai.app").
 #   - Records older than --min-age-hours / PRUNE_MIN_AGE_HOURS (default 24)
 #     so in-flight runs are not touched.
 #   - Anything else is kept untouched.
@@ -33,7 +36,8 @@
 #   PRUNE_MIN_AGE_HOURS=<int> — default minimum age in hours (default: 24).
 #   MAX_DELETE_PCT=<int>     — refuse to delete more than this percentage of
 #                              matched ephemeral records (default: 50).
-#   PRUNE_ZONE_DOMAIN=<domain> — zone domain to anchor matches (default: moleculesai.app).
+#   PRUNE_ZONE_DOMAIN=<domain> — comma-separated zone domain(s) to anchor
+#                                matches (default: staging.moleculesai.app).
 #
 # Exit codes:
 #   0  — dry-run completed or prune executed successfully
@@ -45,7 +49,10 @@ set -euo pipefail
 DRY_RUN=1
 MIN_AGE_HOURS="${PRUNE_MIN_AGE_HOURS:-24}"
 MAX_DELETE_PCT="${MAX_DELETE_PCT:-50}"
-ZONE_DOMAIN="${PRUNE_ZONE_DOMAIN:-moleculesai.app}"
+ZONE_DOMAIN="${PRUNE_ZONE_DOMAIN:-}"
+if [ -z "$ZONE_DOMAIN" ]; then
+  ZONE_DOMAIN="staging.moleculesai.app"
+fi
 
 while [ $# -gt 0 ]; do
   case "$1" in
@@ -246,15 +253,19 @@ from datetime import datetime, timezone, timedelta
 
 min_age = timedelta(hours=int(os.environ["MIN_AGE_HOURS"]))
 zone_domain = os.environ["ZONE_DOMAIN"]
+zone_domains = [d.strip() for d in zone_domain.split(",") if d.strip()]
 now = datetime.now(timezone.utc)
 
-# Conservative: only the two known disposable E2E prefixes, anchored to the
-# configured zone domain so similarly-named records in other zones never match.
+# Conservative: only the two known disposable E2E prefixes, anchored to one
+# of the configured zone domains so similarly-named records in other zones
+# never match. Multiple zone domains may be supplied as a comma-separated
+# list (e.g. "moleculesai.app,staging.moleculesai.app").
 # The prefix MUST be followed immediately by a hyphen and then at least one
 # suffix character, so names like e2e-smokeprod, e2e-smoketest-keep, or
 # prod-e2e-smoke-x are NEVER matched.
+zone_part = r"(?:" + r"|".join(re.escape(d) for d in zone_domains) + r")"
 EPHEMERAL_RE = re.compile(
-    r"^(e2e-smoke-[a-zA-Z0-9_-]+|e2e-tmpl-[a-zA-Z0-9_-]+)\." + re.escape(zone_domain) + r"$"
+    r"^(e2e-smoke-[a-zA-Z0-9_-]+|e2e-tmpl-[a-zA-Z0-9_-]+)\." + zone_part + r"$"
 )
 
 def parse_iso(s):
diff --git a/tests/ops/test_prune_cf_e2e_dns_fail_closed.sh b/tests/ops/test_prune_cf_e2e_dns_fail_closed.sh
index 8d7d9b2e6..6eb284361 100755
--- a/tests/ops/test_prune_cf_e2e_dns_fail_closed.sh
+++ b/tests/ops/test_prune_cf_e2e_dns_fail_closed.sh
@@ -17,7 +17,7 @@ PASS=0
 FAIL=0
 
 run_case() {
-  local name="$1" list_exit="$2" list_body="$3" expect_delete_sentinel="$4" zone_domain="${5:-moleculesai.app}"
+  local name="$1" list_exit="$2" list_body="$3" expect_delete_sentinel="$4" zone_domain="${5:-}"
   local tmp
   tmp=$(mktemp -d -t cf-e2e-prune-fail-closed-XXXXXX)
   local delete_sentinel="$tmp/delete_reached"
@@ -129,9 +129,10 @@ run_case "CF DNS list returns malformed JSON"  0   'this is not json'
 run_case "CF DNS list returns non-array result" 0 '{"success":true,"result":{"id":"rec1"}}'      false-abort
 
 # Helper to build a DNS list result with one record, given created_on ISO string
-# and optional zone domain (default: moleculesai.app).
+# and optional zone domain (default: staging.moleculesai.app, the observed
+# domain for leaked e2e-smoke/e2e-tmpl records).
 make_list() {
-  local created_on="$1" zone_domain="${2:-moleculesai.app}"
+  local created_on="$1" zone_domain="${2:-staging.moleculesai.app}"
   cat <<JSON
 {"success":true,"result":[{"id":"rec1","name":"e2e-smoke-20260622-1234-abcdef12.${zone_domain}","type":"A","created_on":"$created_on"}],"result_info":{"page":1,"total_pages":1,"per_page":100,"count":1}}
 JSON
@@ -154,12 +155,24 @@ run_case "e2e-tmplate-keep (extra chars before hyphen) kept" 0 "$(make_list "$ol
 run_case "e2e-smoke (no hyphen suffix) kept" 0 "$(make_list "$old_ts" | sed 's/e2e-smoke-20260622-1234-abcdef12/e2e-smoke/')" false-keep
 run_case "prod-e2e-smoke-x (does not start with prefix) kept" 0 "$(make_list "$old_ts" | sed 's/e2e-smoke-20260622-1234-abcdef12/prod-e2e-smoke-x/')" false-keep
 
-# Staging subdomain must match when PRUNE_ZONE_DOMAIN is set.
-run_case "old e2e-smoke staging subdomain deleted" 0 "$(make_list "$old_ts" staging.moleculesai.app)" true staging.moleculesai.app
+# Zone-domain coverage (Researcher RC 13130 correctness blocker).
+# Default PRUNE_ZONE_DOMAIN is staging.moleculesai.app, matching observed leaks.
+run_case "old e2e-smoke staging subdomain deleted (default)" 0 "$(make_list "$old_ts")" true
 
-# Old e2e-smoke record must be deleted (happy path, apex domain).
-run_case "old e2e-smoke record deleted" 0 "$(make_list "$old_ts")" true
+# Apex domain is NOT matched when PRUNE_ZONE_DOMAIN is staging only.
+run_case "apex e2e-smoke kept when staging-only" 0 "$(make_list "$old_ts" moleculesai.app)" false-keep staging.moleculesai.app
 
-echo
+# A record under a different subdomain is NOT matched.
+run_case "dev-subdomain e2e-smoke kept" 0 "$(make_list "$old_ts" dev.moleculesai.app)" false-keep staging.moleculesai.app
+
+# Explicit apex zone domain still works when requested.
+run_case "old e2e-smoke apex domain deleted" 0 "$(make_list "$old_ts" moleculesai.app)" true moleculesai.app
+
+# Comma-separated zone domains match both apex and staging.
+run_case "multi-zone matches staging record" 0 "$(make_list "$old_ts")" true "moleculesai.app,staging.moleculesai.app"
+run_case "multi-zone matches apex record" 0 "$(make_list "$old_ts" moleculesai.app)" true "moleculesai.app,staging.moleculesai.app"
+
+# Near-miss under the staging zone is still kept (safety guard).
+run_case "e2e-smoketest-keep under staging kept" 0 "$(make_list "$old_ts" | sed 's/e2e-smoke-20260622-1234-abcdef12/e2e-smoketest-keep/')" false-keep
 echo "passed=$PASS failed=$FAIL"
 [ "$FAIL" -eq 0 ]