diff --git a/src/skill_seekers/cli/doc_scraper.py b/src/skill_seekers/cli/doc_scraper.py
index 3490cc6..502ab30 100755
--- a/src/skill_seekers/cli/doc_scraper.py
+++ b/src/skill_seekers/cli/doc_scraper.py
@@ -471,7 +471,11 @@ class DocToSkillConverter:
                     else:
                         continue
                     full_url = full_url.split("#")[0]
-                    if self._has_md_extension(full_url) and self.is_valid_url(full_url) and full_url not in links:
+                    if (
+                        self._has_md_extension(full_url)
+                        and self.is_valid_url(full_url)
+                        and full_url not in links
+                    ):
                         links.append(full_url)
 
                 return {
@@ -560,7 +564,11 @@ class DocToSkillConverter:
             # Strip anchor fragments
             full_url = full_url.split("#")[0]
             # Only include .md URLs to avoid client-side rendered HTML pages
-            if self._has_md_extension(full_url) and self.is_valid_url(full_url) and full_url not in page["links"]:
+            if (
+                self._has_md_extension(full_url)
+                and self.is_valid_url(full_url)
+                and full_url not in page["links"]
+            ):
                 page["links"].append(full_url)
 
         return page
diff --git a/tests/test_issue_277_discord_e2e.py b/tests/test_issue_277_discord_e2e.py
index f7b01a3..1d48646 100644
--- a/tests/test_issue_277_discord_e2e.py
+++ b/tests/test_issue_277_discord_e2e.py
@@ -88,8 +88,7 @@ class TestIssue277DiscordDocsE2E(unittest.TestCase):
             len(bad_urls),
             0,
             f"Found {len(bad_urls)} URLs with /index.html.md appended "
-            f"(would cause 404s):\n"
-            + "\n".join(bad_urls[:10]),
+            f"(would cause 404s):\n" + "\n".join(bad_urls[:10]),
         )
 
         # Step 6: Verify no anchor fragments leaked through
@@ -97,8 +96,7 @@ class TestIssue277DiscordDocsE2E(unittest.TestCase):
         self.assertEqual(
             len(anchor_urls),
             0,
-            f"Found {len(anchor_urls)} URLs with anchor fragments:\n"
-            + "\n".join(anchor_urls[:10]),
+            f"Found {len(anchor_urls)} URLs with anchor fragments:\n" + "\n".join(anchor_urls[:10]),
         )
 
         # Step 7: Verify we got a reasonable number of URLs
diff --git a/tests/test_issue_277_real_world.py b/tests/test_issue_277_real_world.py
index da65d7f..9cbc280 100644
--- a/tests/test_issue_277_real_world.py
+++ b/tests/test_issue_277_real_world.py
@@ -49,9 +49,7 @@ class TestIssue277RealWorld(unittest.TestCase):
             self.assertNotIn("#", url, f"URL should not contain anchor: {url}")
             # No /index.html.md should be appended to non-.md URLs
             if not url.endswith(".md"):
-                self.assertNotIn(
-                    "index.html.md", url, f"Should not append /index.html.md: {url}"
-                )
+                self.assertNotIn("index.html.md", url, f"Should not append /index.html.md: {url}")
 
         # .md URLs preserved, non-.md URLs preserved as-is, anchors deduplicated
         self.assertIn("https://mikro-orm.io/docs/reference.md", result)
diff --git a/tests/test_unified_scraper_orchestration.py b/tests/test_unified_scraper_orchestration.py
index 02309fc..ec57855 100644
--- a/tests/test_unified_scraper_orchestration.py
+++ b/tests/test_unified_scraper_orchestration.py
@@ -224,11 +224,7 @@ class TestScrapeDocumentation:
             mock_run.return_value = MagicMock(returncode=1, stdout="", stderr="")
             scraper._scrape_documentation(source)
 
-        assert any(
-            "llms_txt_url" in s
-            for c in written_configs
-            for s in c.get("sources", [c])
-        )
+        assert any("llms_txt_url" in s for c in written_configs for s in c.get("sources", [c]))
 
     def test_start_urls_forwarded_to_doc_config(self, tmp_path):
         """start_urls from source is forwarded to the temporary doc config."""
@@ -251,11 +247,7 @@ class TestScrapeDocumentation:
             mock_run.return_value = MagicMock(returncode=1, stdout="", stderr="")
             scraper._scrape_documentation(source)
 
-        assert any(
-            "start_urls" in s
-            for c in written_configs
-            for s in c.get("sources", [c])
-        )
+        assert any("start_urls" in s for c in written_configs for s in c.get("sources", [c]))
 
 
 # ===========================================================================
diff --git a/tests/test_url_conversion.py b/tests/test_url_conversion.py
index 49a3c38..e9be026 100644
--- a/tests/test_url_conversion.py
+++ b/tests/test_url_conversion.py
@@ -280,10 +280,14 @@ class TestHasMdExtension(unittest.TestCase):
 
     def test_md_in_middle_of_path(self):
         """.md in middle of path should not match"""
-        self.assertFalse(DocToSkillConverter._has_md_extension("https://example.com/page.md/subpage"))
+        self.assertFalse(
+            DocToSkillConverter._has_md_extension("https://example.com/page.md/subpage")
+        )
 
     def test_index_html_md(self):
-        self.assertTrue(DocToSkillConverter._has_md_extension("https://example.com/page/index.html.md"))
+        self.assertTrue(
+            DocToSkillConverter._has_md_extension("https://example.com/page/index.html.md")
+        )
 
 
 if __name__ == "__main__":