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OpenAI open-sources MCP Extensions for ChatGPT-native plugins

·2026.11.12 09:00

Key point

The open-source project adds sidebar entrypoints, file handlers, and composer mentions to MCP under the Apache 2.0 license.

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Details

  • OpenAI has open-sourced MCP Extensions, a project that adds ChatGPT-specific capabilities to MCP to enable plugins that feel like native, first-class features.
  • The extension set includes sidebar entrypoints for app access, file extension handlers for custom viewers, composer mentions for resource search, and extended forms for thumbnail-based selection.
  • Developers can integrate extensions using the @openai/mcp-extensions TypeScript SDK for MCP servers and Apps, or the openai-mcp-extensions Python SDK for MCP servers.
  • The project is licensed under Apache License 2.0 and includes a demo plugin, Bits & Bolts, which showcases the extensions through a Parts Library and walkthrough.
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