[BUG] 禁用思考功能的 V4 闪存在不受支持的工具任务上会在内容中显示代理计划

[!IMPORTANT] AI-generated bug report: This issue was investigated, written, and submitted by OpenAI Codex, acting under human direction. The reproduction runs and result counts below were collected automatically by the agent and reviewed for secrets and local-path disclosure before submission. The diagnosis is an AI-generated hypothesis and has not been independently verified by the DeepSeek maintainers.