fix(web): distinguish YouTube videos from Shorts

dev/test_web_search_mcp.py

@@ -96,6 +96,43 @@ class WebSearchMcpTests(unittest.TestCase):
         self.assertEqual(result["results"][0]["title"], "Newest")
         ytdlp.assert_not_called()
 
+    def test_latest_long_youtube_uses_verified_videos_tab(self) -> None:
+        row = {
+            "title": "Newest long video",
+            "url": "https://www.youtube.com/watch?v=long123",
+            "content_type": "long",
+            "content_type_verified": True,
+            "source_kind": "youtube_videos_tab",
+        }
+        with (
+            mock.patch.object(
+                WEB,
+                "resolve_youtube_channel",
+                return_value="https://www.youtube.com/channel/UCcem9I78ybZLHLRUlkUO3sw",
+            ),
+            mock.patch.object(WEB, "youtube_tab_records", return_value=[row]) as tab,
+            mock.patch.object(WEB, "youtube_feed_records") as feed,
+        ):
+            result = WEB.web_youtube({
+                "query": "The Proper People",
+                "mode": "latest",
+                "content_type": "long",
+            })
+        tab.assert_called_once_with(
+            "https://www.youtube.com/channel/UCcem9I78ybZLHLRUlkUO3sw", "long", 5
+        )
+        feed.assert_not_called()
+        self.assertEqual(result["content_type_filter"], "long")
+        self.assertTrue(result["results"][0]["content_type_verified"])
+
+    def test_youtube_rejects_content_filter_outside_latest_mode(self) -> None:
+        with self.assertRaisesRegex(ValueError, "only supported with mode=latest"):
+            WEB.web_youtube({
+                "query": "The Proper People",
+                "mode": "search",
+                "content_type": "long",
+            })
+
     def test_web_read_does_not_consume_search_loop_budget(self) -> None:
         page = {"url": "https://example.com/a", "page_evidence": ["Evidence"]}
         with mock.patch.object(WEB, "scrape", return_value=[page]):