OpenAI MCP Extensions

OpenAI released MCP Extensions, an open-source project that adds ChatGPT-specific capabilities to the Model Context Protocol so developers can build plugins that behave like native features. The extensions let plugins appear in the ChatGPT sidebar, render custom file viewers for supported file types, let users search a plugin's resources from the composer and add references to a message, and support thumbnail-based selection such as picking a CAD part. The project ships TypeScript and Python SDKs — `@openai/mcp-extensions` for MCP servers and Apps, and `openai-mcp-extensions` for MCP servers — under the Apache License 2.0.

OpenAI MCP Extensions adds ChatGPT-specific capabilities to MCP so developers can build plugins that feel like native, first-class features. All examples below use the Bits & Bolts plugin, which you can try by installing the plugin 0-try-it-out . Allow users to access your app from the sidebar. Render custom file viewers when users open a supported file type. Let users search your plugin’s resources from the composer and add references to a message. Let users select a CAD part using thumbnail choices. Install the Bits & Bolts Remote plugin: 1. Install Bits & Bolts Remote from the plugin directory https://chatgpt.com/plugins/plugin asdk app 6abadab6e7d881919e7491d52c7846e8 . 2. Select Bits & Bolts Remote in the sidebar to open the Parts Library . Read the plugin documentation https://developers.openai.com/codex/build-plugins about how to create a plugin. Once you have a plugin… Follow the SDK installation instructions for the current source: - TypeScript https://github.com/openai/mcp-extensions/blob/main/typescript/README.md installation : @openai/mcp-extensions for MCP servers and Apps. - Python https://github.com/openai/mcp-extensions/blob/main/python/README.md installation : openai-mcp-extensions for MCP servers. Read the spec https://github.com/openai/mcp-extensions/blob/main/docs/spec.md to learn more about supported extensions. This project is licensed under the Apache License 2.0 https://github.com/openai/mcp-extensions/blob/main/LICENSE .