I Built an MCP Bridge So Claude Cowork Desktop Can Talk to OpenAI GPT-5.4

I wanted Claude Desktop and Claude Cowork to be able to delegate tasks to OpenAI’s Codex CLI (powered by GPT-5.4) without leaving the conversation. Not just coding tasks. Second opinions on article drafts, code reviews, security audits, content critiques. Any task where a different model’s perspective adds value. Not as a party trick. As a real workflow where one AI can ask another AI for a second opinion, run a review, or handle a task it is not well suited for.The problem: Claude Desktop runs inside a macOS sandbox that restricts which external processes it can reach. And even if it could call the Codex CLI directly, Codex speaks its own protocol, manages its own sessions, and has its own security model. You need something in between.Thanks for reading! Subscribe for free to receive new posts and support my work.So I built a bridge. A full MCP (Model Context Protocol) server that sits between Claude and Codex, translating requests, managing run state, enforcing security boundaries,…