diff --git a/s05_todo_write/code.py b/s05_todo_write/code.py
index 9c88de359..0529cba33 100644
--- a/s05_todo_write/code.py
+++ b/s05_todo_write/code.py
@@ -232,10 +232,8 @@ def summary_hook(messages: list):
 #  agent_loop — same as s04 + nag reminder counter
 # ═══════════════════════════════════════════════════════════
 
-rounds_since_todo = 0
-
 def agent_loop(messages: list):
-    global rounds_since_todo
+    rounds_since_todo = 0
     while True:
         # s05: nag reminder — inject if model hasn't updated todos for 3 rounds
         if rounds_since_todo >= 3 and messages:
diff --git a/s06_subagent/code.py b/s06_subagent/code.py
index 2732246bf..901a63686 100644
--- a/s06_subagent/code.py
+++ b/s06_subagent/code.py
@@ -312,10 +312,8 @@ def summary_hook(messages: list):
 #  agent_loop — same as s05 + nag reminder, task auto-dispatches
 # ═══════════════════════════════════════════════════════════
 
-rounds_since_todo = 0
-
 def agent_loop(messages: list):
-    global rounds_since_todo
+    rounds_since_todo = 0
     while True:
         # s05: nag reminder
         if rounds_since_todo >= 3 and messages:
diff --git a/s07_skill_loading/code.py b/s07_skill_loading/code.py
index b4506fc57..45c04313a 100644
--- a/s07_skill_loading/code.py
+++ b/s07_skill_loading/code.py
@@ -356,10 +356,8 @@ def summary_hook(messages: list):
 #  agent_loop — same as s05-s06 + nag reminder
 # ═══════════════════════════════════════════════════════════
 
-rounds_since_todo = 0
-
 def agent_loop(messages: list):
-    global rounds_since_todo
+    rounds_since_todo = 0
     while True:
         if rounds_since_todo >= 3 and messages:
             messages.append({"role": "user",