优化工具调用格式解析与后端工具调用日志保存逻辑，同时增强列表工具的返回内容展示

backend/app/routers/chat.py

@@ -115,20 +115,24 @@ def _sse(data: dict) -> str:
 
 
 def _save_assistant_message(novel_id: int | None, full_response: str, tool_call_logs: list[str]):
-    """保存 AI 回复到 DB（含工具调用摘要）。在 finally 中调用，确保断连也能保存。"""
-    save_content = full_response
-    if tool_call_logs:
-        tool_summary = "\n".join(tool_call_logs)
-        save_content = f"[以下操作已执行]\n{tool_summary}\n\n{full_response}"
-    if save_content.strip():
-        with Session(engine) as s:
-            ai_msg = ChatMessage(
+    """保存 AI 回复到 DB。工具调用日志和回复文本分别存为独立记录。"""
+    with Session(engine) as s:
+        # 工具调用日志作为单独一条记录
+        if tool_call_logs:
+            tool_summary = "\n".join(tool_call_logs)
+            s.add(ChatMessage(
                 novel_id=novel_id,
                 role="assistant",
-                content=save_content,
-            )
-            s.add(ai_msg)
-            s.commit()
+                content=f"[以下操作已执行]\n{tool_summary}",
+            ))
+        # AI 回复文本作为单独一条记录
+        if full_response.strip():
+            s.add(ChatMessage(
+                novel_id=novel_id,
+                role="assistant",
+                content=full_response,
+            ))
+        s.commit()
 
 
 async def _run_subagent(
@@ -225,15 +229,23 @@ def _summarize_result(tool_name: str, result_json: str) -> str:
     if "error" in data:
         return f"错误: {data['error']}"
 
-    # 列表类工具 → 仅显示数量
+    # 列表类工具 → 显示数量 + 各条目 ID 和标题
     if tool_name == "list_outlines":
-        return f"{data.get('total', 0)}条大纲"
+        items = data.get("outlines", [])
+        brief = ", ".join(f"#{o['id']}{o.get('summary', '')[:15]}" for o in items[:10])
+        return f"{data.get('total', 0)}条大纲: {brief}" if brief else f"{data.get('total', 0)}条大纲"
     if tool_name == "list_characters":
-        return f"{data.get('total', 0)}个角色"
+        items = data.get("characters", [])
+        brief = ", ".join(f"#{c['id']}{c.get('name', '')}" for c in items[:15])
+        return f"{data.get('total', 0)}个角色: {brief}" if brief else f"{data.get('total', 0)}个角色"
     if tool_name == "list_chapters":
-        return f"{data.get('total', 0)}个章节"
+        items = data.get("chapters", [])
+        brief = ", ".join(f"#{c['id']}{c.get('title', '')[:15]}" for c in items[:10])
+        return f"{data.get('total', 0)}个章节: {brief}" if brief else f"{data.get('total', 0)}个章节"
     if tool_name == "list_files":
-        return f"{data.get('total', 0)}个文件"
+        items = data.get("files", [])
+        brief = ", ".join(f"#{f['id']}{f.get('filename', '')}" for f in items[:5])
+        return f"{data.get('total', 0)}个文件: {brief}" if brief else f"{data.get('total', 0)}个文件"
 
     # 创建类 → ID + 标题
     if tool_name == "create_outline":