diff --git a/llm_team_ui.py b/llm_team_ui.py
index 74af0c0..94f9aa8 100644
--- a/llm_team_ui.py
+++ b/llm_team_ui.py
@@ -10780,6 +10780,11 @@ def run_team():
         return jsonify({"error": "Request body required"}), 400
 
     mode = config.get("mode", "")
+    # Alias: external callers (e.g. lakehouse observer.ts) escalate to the underscored
+    # `code_review`, but the canonical registered mode is `codereview` — normalize so
+    # those calls dispatch via RUNNERS instead of silently failing the 400 below.
+    if mode == "code_review":
+        mode = "codereview"
     if not mode:
         return jsonify({"error": "Mode is required"}), 400