diff --git a/navi/tools/reflect.py b/navi/tools/reflect.py
index e5b283d..72776d5 100644
--- a/navi/tools/reflect.py
+++ b/navi/tools/reflect.py
@@ -150,7 +150,11 @@
             "## 🔵 Detailer\n"
             f"{detailer}\n\n"
             "---\n"
-            "Integrate these perspectives into your plan. "
+            "Integrate these perspectives into your plan.\n"
+            "MANDATORY: If the Detailer identified ambiguities that affect the core direction "
+            "(what to build, which approach, what the user actually wants) — "
+            "stop and ask the user to clarify BEFORE writing any code or executing a plan. "
+            "Do not resolve strategic ambiguities by assumption.\n"
             "Prioritise addressing points raised by the Critic before proceeding."
         )