The output result is unstable

[Zswdhy]

{ "type": "AssistantMessage", "content": "AssistantMessage(content=[ToolUseBlock(id='toolu_bdrk_01556RZnze2ygzYkgWuq4ZJM', name='Write', input={'file_path': '/data1/git_code/xxxx/20260303_134140.md', 'content': '# IPv4 地址转换函数开发 Plan 文档\\n\\n**文档版本**: v1.0\\n**创建时间**: 2026-03-03\\n and so on ....'})], model='claude-sonnet-4-6', parent_tool_use_id=None, error=None)" }, { "type": "ResultMessage" "content": "ResultMessage(subtype='success', duration_ms=203253, duration_api_ms=225758, is_error=False, num_turns=13, session_id='93c94260-762c-4d06-84e4-6fbb54bb4848', total_cost_usd=1.2041751, usage={'input_tokens': 26728, 'cache_creation_input_tokens': 159753, 'cache_read_input_tokens': 575706, 'output_tokens': 8083, 'server_tool_use': {'web_search_requests': 0, 'web_fetch_requests': 0}, 'service_tier': 'standard', 'cache_creation': {'ephemeral_1h_input_tokens': 0, 'ephemeral_5m_input_tokens': 159753}}, result='', structured_output=None)" }

The business process is all normal. The expected file has been reflected in the type: AssustMessage structure. There is a file path field in the structure body. Why in type: Within the ResultMessage structure, the result field is an empty string. This phenomenon occurs occasionally. How can it be resolved

[qing-ant]

This is expected behavior. The result field in ResultMessage contains the text the agent produced as its final response text. When the agent's final turn is a tool call (like Write in your case) rather than a text response, the result field will be empty because there is no final text output.

The agent completed successfully (the file was written via the Write tool), and the subtype='success' confirms this. The result field is only populated when the agent's last message is a text response to the user, not a tool call.

If you need to capture the output of tool calls, you can collect the AssistantMessage content blocks during streaming. Closing as expected behavior.