OpenAI Codex MCP Server Integration Remains Broken Despite Announced Fix, User Reports Persistent Per-Thread Attachment Bug
English summary
A user reports that OpenAI Codex's MCP server installation is broken, with servers installed in one thread becoming invisible in another. They spent four hours attempting to diagnose a configuration issue but concluded the feature is simply not functioning. A fix announced on June 9th has not been deployed in the Microsoft Store version. The per-thread attachment model for MCP servers is considered a design flaw; the user ultimately switched to Claude to complete the task.
Chinese summary
用户反映 OpenAI Codex 的 MCP 服务器安装存在缺陷，在一个线程中安装的服务器在另一个线程中不可见。该用户花费四小时排查配置问题后认定该功能本身已故障。6 月 9 日宣布的修复未部署到 Microsoft Store 版本。MCP 服务器的每线程附加模式被视为设计缺陷，用户最终改用 Claude 完成任务。
Key points
Codex MCP server integration fails to share installed servers across different conversation threads.
Codex 的 MCP 服务器集成无法在不同对话线程间共享已安装的服务器。
A fix announced on June 9, 2026, was not available in the Microsoft Store version at the time of the post.
2026 年 6 月 9 日宣布的修复当时未在 Microsoft Store 版本中提供。
The per-thread MCP attachment design caused significant usability issues, forcing the user to switch to Claude.
每线程附加设计导致严重可用性问题，迫使用户改用 Claude。