diff --git a/s04_hooks/README.en.md b/s04_hooks/README.en.md
index 1a910309b..d2123b4e2 100644
--- a/s04_hooks/README.en.md
+++ b/s04_hooks/README.en.md
@@ -57,6 +57,7 @@ Extensions are added via `register_hook()`. The loop only calls `trigger_hooks()
 ## How It Works
 
 **Hook registry**: a dict mapping event names to callback lists.
+**Fault isolation**: Individual hook failures don't prevent other hooks from executing.
 
 ```python
 HOOKS = {
@@ -70,11 +71,24 @@ def register_hook(event: str, callback):
     HOOKS[event].append(callback)
 
 def trigger_hooks(event: str, *args):
+    """Execute all registered hooks for an event with fault isolation.
+    
+    Individual hook failures do not prevent other hooks from executing.
+    Returns the first non-None blocking result, or None if all hooks pass.
+    """
+    blocking_result = None
+    
     for callback in HOOKS[event]:
-        result = callback(*args)
-        if result is not None:   # return value ≠ None → hook says "stop"
-            return result
-    return None
+        try:
+            result = callback(*args)
+            # Capture the first blocking result to prevent execution
+            if result is not None and blocking_result is None:
+                blocking_result = result
+        except Exception as e:
+            # Print error but continue executing remaining hooks
+            print(f"\033[31m[HOOK ERROR] {event} -> {callback.__name__}: {e}\033[0m")
+    
+    return blocking_result
 ```
 
 In the teaching version, PreToolUse returning non-None means block execution; Stop returning non-None means force continuation. UserPromptSubmit and PostToolUse return values are unused.
diff --git a/s04_hooks/README.ja.md b/s04_hooks/README.ja.md
index 71c659fa4..50d23e733 100644
--- a/s04_hooks/README.ja.md
+++ b/s04_hooks/README.ja.md
@@ -57,6 +57,7 @@ s03 のループと権限ロジックは完全に保持される。唯一の変
 ## 仕組み
 
 **フック登録簿**：イベント名をコールバックリストにマッピングする辞書。
+**例外分離**：個々のフック失敗が他のフック実行を妨げない。
 
 ```python
 HOOKS = {
@@ -70,11 +71,24 @@ def register_hook(event: str, callback):
     HOOKS[event].append(callback)
 
 def trigger_hooks(event: str, *args):
+    """Execute all registered hooks for an event with fault isolation.
+    
+    Individual hook failures do not prevent other hooks from executing.
+    Returns the first non-None blocking result, or None if all hooks pass.
+    """
+    blocking_result = None
+    
     for callback in HOOKS[event]:
-        result = callback(*args)
-        if result is not None:   # 戻り値 ≠ None → フックが「止め」と指示
-            return result
-    return None
+        try:
+            result = callback(*args)
+            # Capture the first blocking result to prevent execution
+            if result is not None and blocking_result is None:
+                blocking_result = result
+        except Exception as e:
+            # Print error but continue executing remaining hooks
+            print(f"\033[31m[HOOK ERROR] {event} -> {callback.__name__}: {e}\033[0m")
+    
+    return blocking_result
 ```
 
 教学版では、PreToolUse の非 None 戻り値は実行阻止を意味し、Stop の非 None 戻り値は強制続行を意味する。UserPromptSubmit と PostToolUse の戻り値は未使用。
diff --git a/s04_hooks/README.md b/s04_hooks/README.md
index fc0e2e4f3..c11008a12 100644
--- a/s04_hooks/README.md
+++ b/s04_hooks/README.md
@@ -57,6 +57,7 @@ s03 的循环和权限逻辑完全保留。唯一的变动是把 `check_permissi
 ## 工作原理
 
 **hook 注册表**：一个字典，事件名映射到回调列表。
+**异常隔离**：单个 hook 失败不影响其他 hook 执行。
 
 ```python
 HOOKS = {
@@ -70,11 +71,24 @@ def register_hook(event: str, callback):
     HOOKS[event].append(callback)
 
 def trigger_hooks(event: str, *args):
+    """Execute all registered hooks for an event with fault isolation.
+    
+    Individual hook failures do not prevent other hooks from executing.
+    Returns the first non-None blocking result, or None if all hooks pass.
+    """
+    blocking_result = None
+    
     for callback in HOOKS[event]:
-        result = callback(*args)
-        if result is not None:   # 返回值 ≠ None → hook 说"停"
-            return result
-    return None
+        try:
+            result = callback(*args)
+            # Capture the first blocking result to prevent execution
+            if result is not None and blocking_result is None:
+                blocking_result = result
+        except Exception as e:
+            # Print error but continue executing remaining hooks
+            print(f"\033[31m[HOOK ERROR] {event} -> {callback.__name__}: {e}\033[0m")
+    
+    return blocking_result
 ```
 
 教学版中，PreToolUse 的非 None 返回值会阻止本次工具执行，Stop 的非 None 返回值会强制续跑。UserPromptSubmit 和 PostToolUse 的返回值未被使用。
diff --git a/s04_hooks/code.py b/s04_hooks/code.py
index 756bf7d6d..751193b8a 100644
--- a/s04_hooks/code.py
+++ b/s04_hooks/code.py
@@ -162,11 +162,19 @@ def register_hook(event: str, callback):
     HOOKS[event].append(callback)
 
 def trigger_hooks(event: str, *args):
+    blocking_result = None
+    
     for callback in HOOKS[event]:
-        result = callback(*args)
-        if result is not None:  # teaching shortcut: block this tool call
-            return result
-    return None
+        try:
+            result = callback(*args)
+            # Capture the first blocking result to prevent execution
+            if result is not None and blocking_result is None:
+                blocking_result = result
+        except Exception as e:
+            # Print error but continue executing remaining hooks
+            print(f"\033[31m[HOOK ERROR] {event} -> {callback.__name__}: {e}\033[0m")
+    
+    return blocking_result
 
 
 # s03 permission check logic, now wrapped as a hook