Normalize data agent records output path

src/agent_tools.py

@@ -1207,7 +1207,11 @@ def _data_agent_prepare_generation_plan_tool(arguments: dict[str, Any], context:
             turn_mix=_require_string(arguments, 'turn_mix'),
             coverage=_require_string(arguments, 'coverage'),
             exclusions=_require_string(arguments, 'exclusions'),
-            output_path=_data_agent_output_path(_require_string(arguments, 'output_path'), context),
+            output_path=_data_agent_output_path(
+                _require_string(arguments, 'output_path'),
+                context,
+                canonical_filename='records.jsonl',
+            ),
             target_definitions=_optional_target_definitions(arguments.get('target_definitions')),
             notes=notes,
             confirmed_goal_id=confirmed_goal_id or None,
@@ -1480,10 +1484,15 @@ def _export_dataset_records_tool(arguments: dict[str, Any], context: ToolExecuti
         raise ToolExecutionError('overwrite must be a boolean')
     try:
         records = records_from_tool_argument(arguments['records'])
+        canonical_filename = 'records.json' if output_format == 'json' else 'records.jsonl'
         payload = export_dataset_records(
             records,
             root=str(context.root),
-            output_path=_data_agent_output_path(_require_string(arguments, 'output_path'), context),
+            output_path=_data_agent_output_path(
+                _require_string(arguments, 'output_path'),
+                context,
+                canonical_filename=canonical_filename,
+            ),
             output_format=output_format,
             require_validation_ok=require_validation_ok,
             overwrite=overwrite,
@@ -1493,15 +1502,32 @@ def _export_dataset_records_tool(arguments: dict[str, Any], context: ToolExecuti
     return json.dumps(payload, ensure_ascii=False, indent=2)
 
 
-def _data_agent_output_path(output_path: str, context: ToolExecutionContext) -> str:
-    """把数据 Agent 产物默认路由到当前用户/会话的 output 目录。"""
+def _data_agent_output_path(
+    output_path: str,
+    context: ToolExecutionContext,
+    *,
+    canonical_filename: str | None = None,
+) -> str:
+    """把数据 Agent 产物默认路由到当前用户/会话的 output 目录。
+
+    canonical_filename 用于强制收口最终 records 文件名，避免模型按数据集名
+    自行创建子目录或临时文件名，导致产物位置不稳定。
+    """
 
     raw = output_path.strip()
     path = Path(raw).expanduser()
+
+    output_root = _data_agent_session_output_root(context)
+    if canonical_filename:
+        resolved = (output_root / canonical_filename).resolve(strict=False)
+        try:
+            return resolved.relative_to(context.root).as_posix()
+        except ValueError:
+            return resolved.as_posix()
+
     if path.is_absolute() or path.parts[:1] == ('.port_sessions',):
         return raw
 
-    output_root = _data_agent_session_output_root(context)
     parts = path.parts
     suffix = Path(*parts[1:]) if parts and parts[0] in {'output', 'outputs'} else path
     resolved = (output_root / suffix).resolve(strict=False)