diff --git a/tools/pr-approval-agent/README.md b/tools/pr-approval-agent/README.md
index adb04a57ce..e78e112e74 100644
--- a/tools/pr-approval-agent/README.md
+++ b/tools/pr-approval-agent/README.md
@@ -58,7 +58,7 @@ Deny-list (hard gate)
   │
   ▼
 Size ceiling (hard gate)
-  - >500 lines or >20 files → too large for auto-review
+  - >1000 lines or >20 files → too large for auto-review
   │
   ▼
 Tier classification
diff --git a/tools/pr-approval-agent/gates.py b/tools/pr-approval-agent/gates.py
index ee4be575eb..74c82f971e 100644
--- a/tools/pr-approval-agent/gates.py
+++ b/tools/pr-approval-agent/gates.py
@@ -525,7 +525,7 @@ def detect_ownership(files: list[str], rules: list[CodeownersRule]) -> dict:
 # ── Tier assignment ──────────────────────────────────────────────
 
 
-MAX_LINES = 500
+MAX_LINES = 1000
 MAX_FILES = 20