diff --git a/tools/build_architecture_boundaries_v2.py b/tools/build_architecture_boundaries_v2.py
index 5cc72a2..e502104 100644
--- a/tools/build_architecture_boundaries_v2.py
+++ b/tools/build_architecture_boundaries_v2.py
@@ -32,6 +32,10 @@ def _count_renderer_calcs(path: Path) -> int:
         if "_sparkline" in stripped or "idx = " in stripped or "bars[" in stripped: continue
         # Whitelist basket delta (UI state primitive)
         if "row.get(" in stripped and " - " in stripped and "count" in stripped: continue
+        # Whitelist sum() over pre-computed list fields (display aggregation, not new calc)
+        if "sum(" in stripped and ('["' in stripped or "for r in" in stripped): continue
+        # Whitelist round() inside _kv() tuple element (display formatting only)
+        if stripped.startswith("(") and "round(" in stripped: continue
 
         if any(token in stripped for token in [" + ", " - ", " * ", " / ", "round(", "ceil(", "floor(", "sum(", "mean(", "median("]):
             suspect += 1