diff --git a/backend/apps/agents/browser/browser_prestage.py b/backend/apps/agents/browser/browser_prestage.py
index b1281eeb..3c75c73c 100644
--- a/backend/apps/agents/browser/browser_prestage.py
+++ b/backend/apps/agents/browser/browser_prestage.py
@@ -40,6 +40,9 @@ P_SYSTEM = (
     "accepts, connects, or subscribes. Opening a composer (e.g. a 'Message' "
     "button) is allowed; pressing its Send is not. If the next needed step is "
     "typing text or an irreversible click, the stage is set.\n"
+    "For a task that messages a PERSON: go to that person (search result, "
+    "profile), then open their Message/compose surface; never detour to a "
+    "feed or homepage.\n"
     "Reply with exactly ONE line:\n"
     "NAVIGATE <absolute url>\n"
     "CLICK <index>\n"