Fix empty tool-use response handling

s15_integrated_harness/code.py

@@ -1499,11 +1499,12 @@ def spawn_teammate_thread(name: str, role: str, prompt: str,
                          f"{type(exc).__name__}: {exc}", "error")
                 break
             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 tool_calls:
                 results = []
-                for block in response.content:
-                    if block.type != "tool_use":
-                        continue
+                for block in tool_calls:
                     output = _run_teammate_tool(name, block, sub_handlers)
                     results.append({"type": "tool_result",
                                     "tool_use_id": block.id,

s15_integrated_harness/images/system-architecture.en.svg

@@ -33,7 +33,7 @@
   <line x1="375" y1="152" x2="417" y2="152" stroke="#475569" stroke-width="1.5" marker-end="url(#arrow)"/>
   <rect x="420" y="118" width="110" height="68" rx="7" fill="#fff" stroke="#2563eb" stroke-width="1.4"/>
   <text x="475" y="146" text-anchor="middle" fill="#1e3a5f" font-size="12" font-weight="700">LLM</text>
-  <text x="475" y="164" text-anchor="middle" fill="#64748b" font-size="8.5">stop_reason=tool_use?</text>
+  <text x="475" y="164" text-anchor="middle" fill="#64748b" font-size="8.5">tool_use block?</text>
   <line x1="530" y1="152" x2="572" y2="152" stroke="#475569" stroke-width="1.5" marker-end="url(#arrow)"/>
   <rect x="575" y="118" width="150" height="68" rx="7" fill="#fff7ed" stroke="#ea580c" stroke-width="1.6"/>
   <text x="650" y="140" text-anchor="middle" fill="#9a3412" font-size="11" font-weight="700">Before Tools</text>

s15_integrated_harness/images/system-architecture.ja.svg

@@ -33,7 +33,7 @@
   <line x1="375" y1="152" x2="417" y2="152" stroke="#475569" stroke-width="1.5" marker-end="url(#arrow)"/>
   <rect x="420" y="118" width="110" height="68" rx="7" fill="#fff" stroke="#2563eb" stroke-width="1.4"/>
   <text x="475" y="146" text-anchor="middle" fill="#1e3a5f" font-size="12" font-weight="700">LLM</text>
-  <text x="475" y="164" text-anchor="middle" fill="#64748b" font-size="8.5">stop_reason=tool_use?</text>
+  <text x="475" y="164" text-anchor="middle" fill="#64748b" font-size="8.5">tool_use block?</text>
   <line x1="530" y1="152" x2="572" y2="152" stroke="#475569" stroke-width="1.5" marker-end="url(#arrow)"/>
   <rect x="575" y="118" width="150" height="68" rx="7" fill="#fff7ed" stroke="#ea580c" stroke-width="1.6"/>
   <text x="650" y="140" text-anchor="middle" fill="#9a3412" font-size="11" font-weight="700">Tool 前</text>

s15_integrated_harness/images/system-architecture.svg

@@ -41,7 +41,7 @@
 
   <rect x="420" y="118" width="110" height="68" rx="7" fill="#fff" stroke="#2563eb" stroke-width="1.4"/>
   <text x="475" y="146" text-anchor="middle" fill="#1e3a5f" font-size="12" font-weight="700">LLM</text>
-  <text x="475" y="164" text-anchor="middle" fill="#64748b" font-size="8.5">stop_reason=tool_use?</text>
+  <text x="475" y="164" text-anchor="middle" fill="#64748b" font-size="8.5">tool_use block?</text>
 
   <line x1="530" y1="152" x2="572" y2="152" stroke="#475569" stroke-width="1.5" marker-end="url(#arrow)"/>