Fix empty tool-use response handling

s03_permission/README.ja.md

@@ -108,13 +108,12 @@ def check_permission(block) -> bool:
     return True
 
 # agent_loop で — s02 のループに 1 行追加するだけ：
-for block in response.content:
-    if block.type == "tool_use":
-        if not check_permission(block):           # ← 新規
-            results.append({... "content": "Permission denied."})
-            continue
-        output = TOOL_HANDLERS[block.name](**block.input)  # s02 既存
-        results.append(...)
+for block in tool_calls:
+    if not check_permission(block):           # ← 新規
+        results.append({... "content": "Permission denied."})
+        continue
+    output = TOOL_HANDLERS[block.name](**block.input)  # s02 既存
+    results.append(...)
 ```
 
 ---

s03_permission/README.md

@@ -108,13 +108,12 @@ def check_permission(block) -> bool:
     return True
 
 # In agent_loop — s02's loop with just one line added:
-for block in response.content:
-    if block.type == "tool_use":
-        if not check_permission(block):           # ← NEW
-            results.append({... "content": "Permission denied."})
-            continue
-        output = TOOL_HANDLERS[block.name](**block.input)  # s02 original
-        results.append(...)
+for block in tool_calls:
+    if not check_permission(block):           # ← NEW
+        results.append({... "content": "Permission denied."})
+        continue
+    output = TOOL_HANDLERS[block.name](**block.input)  # s02 original
+    results.append(...)
 ```
 
 ---

s03_permission/README.zh.md

@@ -108,13 +108,12 @@ def check_permission(block) -> bool:
     return True
 
 # 在 agent_loop 中——s02 的循环只加了一行：
-for block in response.content:
-    if block.type == "tool_use":
-        if not check_permission(block):           # ← 新增
-            results.append({... "content": "Permission denied."})
-            continue
-        output = TOOL_HANDLERS[block.name](**block.input)  # s02 原有
-        results.append(...)
+for block in tool_calls:
+    if not check_permission(block):           # ← 新增
+        results.append({... "content": "Permission denied."})
+        continue
+    output = TOOL_HANDLERS[block.name](**block.input)  # s02 原有
+    results.append(...)
 ```
 
 ---

s03_permission/code.py

@@ -197,14 +197,14 @@ def agent_loop(messages: list):
         )
         messages.append({"role": "assistant", "content": response.content})
 
-        if response.stop_reason != "tool_use":
+        tool_calls = [
+            block for block in response.content if block.type == "tool_use"
+        ]
+        if not tool_calls:
             return
 
         results = []
-        for block in response.content:
-            if block.type != "tool_use":
-                continue
-
+        for block in tool_calls:
             print(f"\033[36m> {block.name}\033[0m")
 
             # s03 change: run through permission pipeline before executing

s03_permission/images/permission-overview.en.svg

@@ -36,7 +36,7 @@
   <!-- LLM -->
   <rect x="230" y="84" width="130" height="48" rx="8" fill="#fff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="295" y="104" fill="#1e3a5f" font-size="13" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="295" y="122" fill="#64748b" font-size="10" text-anchor="middle">stop_reason?</text>
+  <text x="295" y="122" fill="#64748b" font-size="10" text-anchor="middle">tool_use block?</text>
 
   <!-- No → return -->
   <line x1="295" y1="132" x2="295" y2="156" stroke="#16a34a" stroke-width="1.5" marker-end="url(#arrow)"/>

s03_permission/images/permission-overview.ja.svg

@@ -36,7 +36,7 @@
   <!-- LLM -->
   <rect x="230" y="84" width="130" height="48" rx="8" fill="#fff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="295" y="104" fill="#1e3a5f" font-size="13" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="295" y="122" fill="#64748b" font-size="10" text-anchor="middle">stop_reason?</text>
+  <text x="295" y="122" fill="#64748b" font-size="10" text-anchor="middle">tool_use block?</text>
 
   <!-- No → 戻る -->
   <line x1="295" y1="132" x2="295" y2="156" stroke="#16a34a" stroke-width="1.5" marker-end="url(#arrow)"/>

s03_permission/images/permission-overview.svg

@@ -36,7 +36,7 @@
   <!-- LLM -->
   <rect x="230" y="84" width="130" height="48" rx="8" fill="#fff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="295" y="104" fill="#1e3a5f" font-size="13" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="295" y="122" fill="#64748b" font-size="10" text-anchor="middle">stop_reason?</text>
+  <text x="295" y="122" fill="#64748b" font-size="10" text-anchor="middle">tool_use block?</text>
 
   <!-- 否 → 返回 -->
   <line x1="295" y1="132" x2="295" y2="156" stroke="#16a34a" stroke-width="1.5" marker-end="url(#arrow)"/>