Fix empty tool-use response handling

s08_context_compact/README.ja.md

@@ -255,13 +255,13 @@ def agent_loop(messages, active_request):
 1 回の応答には、ファイル書き込みと圧縮のように複数のツール呼び出しが含まれることがあります。Harness はまず一括処理をすべて実行し、各 `tool_use` に対応する `tool_result` を追加します。そのターンが完結してから要約します。
 
 ```python
+tool_calls = [
+    block for block in response.content if block.type == "tool_use"
+]
 results = []
 compact_requested = False
 
-for block in response.content:
-    if block.type != "tool_use":
-        continue
-
+for block in tool_calls:
     if block.name == "compact":
         output = "Compaction requested after this tool batch."
         compact_requested = True

s08_context_compact/README.md

@@ -255,13 +255,13 @@ An automatic threshold knows only how large the context is. The model can also c
 A response may request several tools at once, such as writing a file and then compacting. The Harness first executes the complete batch and appends one `tool_result` for every `tool_use`. It summarizes only after that turn is complete:
 
 ```python
+tool_calls = [
+    block for block in response.content if block.type == "tool_use"
+]
 results = []
 compact_requested = False
 
-for block in response.content:
-    if block.type != "tool_use":
-        continue
-
+for block in tool_calls:
     if block.name == "compact":
         output = "Compaction requested after this tool batch."
         compact_requested = True

s08_context_compact/README.zh.md

@@ -255,13 +255,13 @@ def agent_loop(messages, active_request):
 一次响应可以同时包含多个工具调用，例如先写文件再请求压缩。Harness 必须先执行完整批次，并为每个 `tool_use` 追加对应的 `tool_result`，然后再摘要这个已经闭合的回合：
 
 ```python
+tool_calls = [
+    block for block in response.content if block.type == "tool_use"
+]
 results = []
 compact_requested = False
 
-for block in response.content:
-    if block.type != "tool_use":
-        continue
-
+for block in tool_calls:
     if block.name == "compact":
         output = "Compaction requested after this tool batch."
         compact_requested = True

s08_context_compact/code.py

@@ -432,7 +432,10 @@ def agent_loop(messages: list, active_request: str):
             raise
 
         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:
             force = trigger_hooks("Stop", messages)
             if force:
                 messages.append({"role": "user", "content": force})
@@ -441,9 +444,7 @@ def agent_loop(messages: list, active_request: str):
 
         results = []
         compact_requested = False
-        for block in response.content:
-            if block.type != "tool_use":
-                continue
+        for block in tool_calls:
             print(f"\033[36m> {block.name}\033[0m")
             if block.name == "compact":
                 output = "Compaction requested after this tool batch."

s08_context_compact/images/compact-overview.en.svg

@@ -85,7 +85,7 @@
   <!-- ===== ③ LLM ===== -->
   <rect x="440" y="132" width="100" height="52" rx="8" fill="#f0f4ff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="490" y="155" fill="#1e3a5f" font-size="14" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="490" y="172" fill="#64748b" font-size="9" text-anchor="middle">stop_reason=tool_use?</text>
+  <text x="490" y="172" fill="#64748b" font-size="9" text-anchor="middle">tool_use block?</text>
 
   <!-- LLM No → Return -->
   <line x1="490" y1="184" x2="490" y2="278" stroke="#16a34a" stroke-width="2" marker-end="url(#arrow-green)"/>

s08_context_compact/images/compact-overview.ja.svg

@@ -85,7 +85,7 @@
   <!-- ===== ③ LLM ===== -->
   <rect x="440" y="132" width="100" height="52" rx="8" fill="#f0f4ff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="490" y="155" fill="#1e3a5f" font-size="14" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="490" y="172" fill="#64748b" font-size="9" text-anchor="middle">stop_reason=tool_use?</text>
+  <text x="490" y="172" fill="#64748b" font-size="9" text-anchor="middle">tool_use block?</text>
 
   <!-- LLM No → 返却 -->
   <line x1="490" y1="184" x2="490" y2="278" stroke="#16a34a" stroke-width="2" marker-end="url(#arrow-green)"/>

s08_context_compact/images/compact-overview.svg

@@ -85,7 +85,7 @@
   <!-- ===== ③ LLM ===== -->
   <rect x="440" y="132" width="100" height="52" rx="8" fill="#f0f4ff" stroke="#2563eb" stroke-width="1.5"/>
   <text x="490" y="155" fill="#1e3a5f" font-size="14" font-weight="700" text-anchor="middle">LLM</text>
-  <text x="490" y="172" fill="#64748b" font-size="9" text-anchor="middle">stop_reason=tool_use?</text>
+  <text x="490" y="172" fill="#64748b" font-size="9" text-anchor="middle">tool_use block?</text>
 
   <!-- LLM 否 → 返回 -->
   <line x1="490" y1="184" x2="490" y2="278" stroke="#16a34a" stroke-width="2" marker-end="url(#arrow-green)"/>