# ChatGPT Updates: Plugin Development and Codex Workflows

> Comprehensive engineering guide to creating, packaging, testing, and submitting plugins for ChatGPT and Codex: manifest specification, MCP servers, lifecycle hooks, custom marketplaces, and OpenAI review.

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> **[Restricted Content]**
> The full version is available to AI-Base / Plus subscribers or via one-time purchase.
> Open the full guide on the website: https://gotburnout.io/en/guides/ai_base/chatgpt-plugins-and-codex-workflows-guide