diff --git a/.github/workflows/navigation-links.yml b/.github/workflows/navigation-links.yml
index 2e3b16397..7d18c0508 100644
--- a/.github/workflows/navigation-links.yml
+++ b/.github/workflows/navigation-links.yml
@@ -26,15 +26,16 @@ jobs:
       - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97
         with:
           python-version: '3.11.16'
-      - name: Resolve every link from the containing document and check every file-sourced quotation, in both interpreter modes
+      - name: Resolve every link from the containing document and authenticate every navigation quotation, in both interpreter modes
         env:
           PYTHONDONTWRITEBYTECODE: '1'
+          GITHUB_TOKEN: ${{ github.token }}
         run: |
           set -euo pipefail
           python -B -S tools/check_doc_links.py PROOF_INDEX.md docs/integration/*.md
           python -B -O -S tools/check_doc_links.py PROOF_INDEX.md docs/integration/*.md
-          python -B -S tools/check_doc_quotes.py PROOF_INDEX.md docs/integration/2026-09-29-navigation-refresh.md
-          python -B -O -S tools/check_doc_quotes.py PROOF_INDEX.md docs/integration/2026-09-29-navigation-refresh.md
+          python -B -S tools/check_doc_quotes.py --github --require-online PROOF_INDEX.md docs/integration/2026-09-29-navigation-refresh.md
+          python -B -O -S tools/check_doc_quotes.py --github --require-online PROOF_INDEX.md docs/integration/2026-09-29-navigation-refresh.md
           python -B -S -m unittest -v tests.test_navigation_links tests.test_navigation_quotes
           python -B -O -S -m unittest -v tests.test_navigation_links tests.test_navigation_quotes
           git diff --exit-code
diff --git a/tests/test_navigation_quotes.py b/tests/test_navigation_quotes.py
index 9063797e3..03f6fd8f4 100644
--- a/tests/test_navigation_quotes.py
+++ b/tests/test_navigation_quotes.py
@@ -89,6 +89,25 @@ def test_github_link_is_unchecked_offline_not_failed(self):
         self.assertEqual(report['failures'], [])
         self.assertEqual((report['checked'], report['unchecked_offline']), (0, 1))
 
+
+    def test_require_online_rejects_unchecked_github_link(self):
+        doc = self.root / 'docs' / 'nested' / 'a.md'
+        doc.write_text(HEADER + '| #1 | [c](https://github.com/o/r/pull/1#issuecomment-2) — “anything at all” |\n', encoding='utf-8')
+        rc = check_doc_quotes.main([str(doc), '--root', self.tmp, '--require-online'])
+        self.assertEqual(rc, 1)
+
+    def test_github_transport_failure_is_not_counted_as_offline(self):
+        doc = self.root / 'docs' / 'nested' / 'a.md'
+        doc.write_text(HEADER + '| #1 | [c](https://github.com/o/r/pull/1#issuecomment-2) — “anything at all” |\n', encoding='utf-8')
+        original = check_doc_quotes.Sources._fetch
+        try:
+            check_doc_quotes.Sources._fetch = lambda self, match: (None, 'unreachable')
+            report = check_doc_quotes.check_document(str(doc), self.tmp, github=True, token='x')
+        finally:
+            check_doc_quotes.Sources._fetch = original
+        self.assertEqual(report['unchecked_offline'], 0)
+        self.assertEqual([f[0] for f in report['failures']], ['source-unreachable'])
+
     def test_nearest_preceding_link_governs_each_passage(self):
         (self.root / 'reviews' / 's.md').write_text('Disposition: AMEND the ledger.\n', encoding='utf-8')
         row = ('| #1 | [r](../../reviews/r.md) — “No defect was found.”'
diff --git a/tools/check_doc_quotes.py b/tools/check_doc_quotes.py
index 1e25a80ba..635505b48 100644
--- a/tools/check_doc_quotes.py
+++ b/tools/check_doc_quotes.py
@@ -187,14 +187,18 @@ def main(argv=None):
     parser.add_argument('documents', nargs='+')
     parser.add_argument('--root', default=os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
     parser.add_argument('--github', action='store_true', help='also check GitHub review/comment links (GITHUB_TOKEN)')
+    parser.add_argument('--require-online', action='store_true', help='fail if any linked GitHub/HTTP source is left unchecked offline')
     args = parser.parse_args(argv)
     token = os.environ.get('GITHUB_TOKEN')
-    report = {'root': os.path.realpath(args.root), 'github': args.github, 'documents': {}, 'passed': True}
+    report = {'root': os.path.realpath(args.root), 'github': args.github, 'require_online': args.require_online, 'documents': {}, 'passed': True}
     for doc in args.documents:
         result = check_document(doc, args.root, args.github, token)
         report['documents'][doc] = result
         if result['failures']:
             report['passed'] = False
+        if args.require_online and result['unchecked_offline']:
+            result['failures'].append(['unchecked-offline-required', '', str(result['unchecked_offline'])])
+            report['passed'] = False
     print(json.dumps(report, indent=2, sort_keys=True))
     return 0 if report['passed'] else 1