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openai/mcp-extensions

Build plugins that feel like native, first-class features of ChatGPT.

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Created Sep 29, 2026Updated Sep 30, 2026

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README

OpenAI MCP Extensions

OpenAI MCP Extensions adds ChatGPT-specific capabilities to MCP so developers can build plugins that feel like native, first-class features.

Showcase

All examples below use the Bits & Bolts plugin, which you can try by installing the plugin.

Sidebar entrypoints

Allow users to access your app from the sidebar.

Opening an MCP App from the sidebar

File extension handlers

Render custom file viewers when users open a supported file type.

Opening a CAD file in a custom file viewer

Composer mentions

Let users search your plugin’s resources from the composer and add references to a message.

Searching for a CAD part with composer mentions

Extended forms

Let users select a CAD part using thumbnail choices.

Selecting a CAD part in a Bits & Bolts form

Get started

0. Try it out

Install the Bits & Bolts Remote plugin:

  1. Install Bits & Bolts Remote from the plugin directory.

  2. Select Bits & Bolts Remote in the sidebar to open the Parts Library.

    Bits & Bolts Remote selected in the sidebar with the Parts Library open

1. Create a plugin

Read the plugin documentation about how to create a plugin. Once you have a plugin…

2. Add the SDKs to your MCP server

Follow the SDK installation instructions for the current source:

  • TypeScript: @openai/mcp-extensions for MCP servers and Apps.
  • Python: openai-mcp-extensions for MCP servers.

3. Explore supported extensions

Read the spec to learn more about supported extensions.

License

This project is licensed under the Apache License 2.0.