Fix empty tool-use response handling

s09_memory/README.ja.md

@@ -96,7 +96,10 @@ system = build_system(relevant_memories)
 ユーザーが毎回「覚えて」と言うとは限らない。Agent が現在の返答を終えた後、`extract_memories()` は会話を確認し、今後も役立つ可能性がある情報だけを取り出す。
 
 ```python
-if response.stop_reason != "tool_use":
+tool_calls = [
+    block for block in response.content if block.type == "tool_use"
+]
+if not tool_calls:
     force = trigger_hooks("Stop", messages)
     if force:
         messages.append({"role": "user", "content": force})

s09_memory/README.md

@@ -96,7 +96,10 @@ system = build_system(relevant_memories)
 Users do not always say "remember this." After the Agent finishes the current response, `extract_memories()` inspects the conversation and keeps only information likely to help later:
 
 ```python
-if response.stop_reason != "tool_use":
+tool_calls = [
+    block for block in response.content if block.type == "tool_use"
+]
+if not tool_calls:
     force = trigger_hooks("Stop", messages)
     if force:
         messages.append({"role": "user", "content": force})

s09_memory/README.zh.md

@@ -96,7 +96,10 @@ system = build_system(relevant_memories)
 用户不一定会明确说“请记住”。`extract_memories()` 在 Agent 完成本轮回答后检查当前对话，只提取以后仍可能有用的信息：
 
 ```python
-if response.stop_reason != "tool_use":
+tool_calls = [
+    block for block in response.content if block.type == "tool_use"
+]
+if not tool_calls:
     force = trigger_hooks("Stop", messages)
     if force:
         messages.append({"role": "user", "content": force})

s09_memory/code.py

@@ -714,7 +714,10 @@ def agent_loop(messages: list):
             "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:
             force = trigger_hooks("Stop", messages)
             if force:
                 messages.append({"role": "user", "content": force})
@@ -724,9 +727,7 @@ def agent_loop(messages: list):
             return
 
         results = []
-        for block in response.content:
-            if block.type != "tool_use":
-                continue
+        for block in tool_calls:
             output = execute_tool(block)
             results.append({
                 "type": "tool_result",

s09_memory/images/memory-overview.en.svg

@@ -57,8 +57,8 @@
   <!-- ===== LLM ===== -->
   <rect x="475" y="96" width="80" height="52" rx="8" fill="#f0f4ff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="515" y="114" fill="#1e3a5f" font-size="14" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="515" y="132" fill="#64748b" font-size="9" text-anchor="middle">stop_reason</text>
-  <text x="515" y="144" fill="#64748b" font-size="9" text-anchor="middle">=tool_use?</text>
+  <text x="515" y="132" fill="#64748b" font-size="9" text-anchor="middle">tool_use</text>
+  <text x="515" y="144" fill="#64748b" font-size="9" text-anchor="middle">block?</text>
 
   <!-- LLM → no → return result -->
   <line x1="515" y1="148" x2="515" y2="178" stroke="#16a34a" stroke-width="1.5" marker-end="url(#arrow-green)"/>

s09_memory/images/memory-overview.ja.svg

@@ -57,8 +57,8 @@
   <!-- ===== LLM ===== -->
   <rect x="475" y="96" width="80" height="52" rx="8" fill="#f0f4ff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="515" y="114" fill="#1e3a5f" font-size="14" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="515" y="132" fill="#64748b" font-size="9" text-anchor="middle">stop_reason</text>
-  <text x="515" y="144" fill="#64748b" font-size="9" text-anchor="middle">=tool_use?</text>
+  <text x="515" y="132" fill="#64748b" font-size="9" text-anchor="middle">tool_use</text>
+  <text x="515" y="144" fill="#64748b" font-size="9" text-anchor="middle">block?</text>
 
   <!-- LLM → no → return result -->
   <line x1="515" y1="148" x2="515" y2="178" stroke="#16a34a" stroke-width="1.5" marker-end="url(#arrow-green)"/>

s09_memory/images/memory-overview.svg

@@ -57,8 +57,8 @@
   <!-- ===== LLM ===== -->
   <rect x="475" y="96" width="80" height="52" rx="8" fill="#f0f4ff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="515" y="114" fill="#1e3a5f" font-size="14" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="515" y="132" fill="#64748b" font-size="9" text-anchor="middle">stop_reason</text>
-  <text x="515" y="144" fill="#64748b" font-size="9" text-anchor="middle">=tool_use?</text>
+  <text x="515" y="132" fill="#64748b" font-size="9" text-anchor="middle">tool_use</text>
+  <text x="515" y="144" fill="#64748b" font-size="9" text-anchor="middle">block?</text>
 
   <!-- LLM → 否 → 返回结果 -->
   <line x1="515" y1="148" x2="515" y2="178" stroke="#16a34a" stroke-width="1.5" marker-end="url(#arrow-green)"/>