diff --git a/docs/guides/observability_ui_governance.md b/docs/guides/observability_ui_governance.md
index 5f89094..eab8575 100644
--- a/docs/guides/observability_ui_governance.md
+++ b/docs/guides/observability_ui_governance.md
@@ -78,6 +78,12 @@ python3 scripts/check_observability_pages.py
 
 或透過 quick review 選單執行第 7 項。
 
+此巡檢不只檢查 HTTP 200，也會檢查：
+
+- 不得出現 framework / database exception 文案。
+- 每頁必須包含自己的核心標題與內容 marker。
+- HTML 不能小到像空殼頁或錯誤 fallback。
+
 ```bash
 python3 - <<'PY'
 import urllib.request
diff --git a/scripts/check_observability_pages.py b/scripts/check_observability_pages.py
index ff8803a..76f6738 100644
--- a/scripts/check_observability_pages.py
+++ b/scripts/check_observability_pages.py
@@ -27,6 +27,21 @@ PAGES = [
     ("/observability/ppt_audit_history", "PPT"),
 ]
 
+EXPECTED_MARKERS = {
+    "/observability/overview": ["觀測台總覽", "主機健康", "AI 呼叫"],
+    "/observability/agent_orchestration": ["Agent 編排矩陣", "LLM", "MCP", "RAG"],
+    "/observability/business_intel": ["商業面 × AI", "AI", "競品"],
+    "/observability/host_health": ["主機健康", "Ollama", "AutoHeal"],
+    "/observability/ai_calls": ["AI 呼叫", "Provider", "RAG"],
+    "/observability/budget": ["預算控管", "force", "throttle"],
+    "/observability/promotion_review": ["RAG 晉升審核", "Promotion", "ai_insights"],
+    "/observability/rag_queries": ["RAG 召回詳情", "最近 50", "hits"],
+    "/observability/quality_trend": ["反饋趨勢", "Caller", "蒸餾"],
+    "/observability/ppt_audit_history": ["PPT 視覺審核", "AiderHeal", "audit"],
+}
+
+MIN_HTML_BYTES = 2500
+
 ERROR_NEEDLES = [
     "Traceback",
     "UndefinedError",
@@ -70,8 +85,22 @@ def main() -> int:
             continue
 
         found = [needle for needle in ERROR_NEEDLES if needle in html]
-        if status != 200 or found:
-            print(f"- {label}: HTTP {status}, issues={found or 'bad_status'}, FAIL")
+        missing_markers = [
+            marker for marker in EXPECTED_MARKERS.get(path, [])
+            if marker not in html
+        ]
+        too_small = len(html.encode("utf-8")) < MIN_HTML_BYTES
+        if status != 200 or found or missing_markers or too_small:
+            issues = []
+            if status != 200:
+                issues.append("bad_status")
+            if found:
+                issues.extend(found)
+            if missing_markers:
+                issues.append(f"missing_markers={missing_markers}")
+            if too_small:
+                issues.append(f"html_too_small={len(html.encode('utf-8'))}B")
+            print(f"- {label}: HTTP {status}, issues={issues}, FAIL")
             failed = True
         else:
             print(f"- {label}: HTTP {status}, issues=none")