SoftwareFramework

OpenAI MCP Extensions

OpenAI MCP Extensions is a framework maintained by OpenAI1 7 8, released Sep 29, 2026. Its source code is public1 under the Apache License 2.02 7 8.

OpenAI MCP Extensions is a specification and pair of SDKs from OpenAI that add ChatGPT-specific capabilities on top of the Model Context Protocol (MCP) and MCP Apps, so that plugins can appear in ChatGPT's interface. Documented extensions include sidebar and thread entrypoints, file-type handlers, structured settings, composer at-mentions, and extended form elicitation. The TypeScript SDK extends the official MCP TypeScript SDKs for servers and apps; the Python SDK extends the official MCP Python SDK for servers.1 3 4 5Fact reviewed Oct 4, 2026

Repository: Repository (external site: github.com)
Documentation: Specification (external site: github.com)
License: LICENSE (Apache-2.0) (external site: github.com)
Release notes: Release notes (Python 0.1.0) (external site: github.com)

Last reviewedOct 4, 2026Entry updated Oct 4, 2026Documented release Sep 29, 2026

Availability and license

Overall availability

Public

Source code is public; the SDKs install from npm (@openai/mcp-extensions) and PyPI (openai-mcp-extensions). The extensions take effect only in ChatGPT, OpenAI's hosted product, which is not open.1 7 8 3

Availability fact review: Oct 4, 2026

Availability is separate from permission: read the license before using or redistributing.

Apache License 2.0 (external site: github.com)2 7 8
Applies to: Code · SPDX Apache-2.0 · on the rubric’s OSI-approved software-license list · fact reviewed Oct 4, 2026
Plain-language guide to the Apache License 2.0

The Apache 2.0 license covers the specification and SDK code in the repository. It does not cover ChatGPT or OpenAI's hosted models and services, which have their own terms.2 1Fact reviewed Oct 4, 2026

Component reuse rights

A readable or downloadable component is not automatically reusable. These indicators concern recorded license evidence, not system certification.

weights: Unknown — no complete fact-level rights review
code: Reviewed qualifying license recorded — check scope and conditions
data: Unknown — no complete fact-level rights review
documentation: Unknown — no complete fact-level rights review

No complete system-rights review is recorded for this release.

Public materials checklist

Items for a framework under USASI rubric v0.2. Unknown means unassessed or insufficient evidence.

Public materials checklist for OpenAI MCP Extensions
Item	Status	Notes and evidence
Source codeIs the source code publicly readable?	Public	Public repository containing the specification and the TypeScript and Python SDKs.1
DocumentationIs user documentation published?	Public	The specification and per-SDK READMEs document each extension with examples.3 4 5
InstallationAre installation instructions or packages publicly available?	Public	Installed from npm as @openai/mcp-extensions or from PyPI as openai-mcp-extensions.4 5
Supported platformsAre supported operating systems or hardware documented?	Public	The npm package requires Node.js 22 or newer and the PyPI package Python 3.10 or newer. The specification's support table shows which extensions work in ChatGPT on desktop, web, iOS, and Android; several are desktop-only.7 8 3
Release statusAre versioned releases published?	Public	First releases python-v0.1.0 and node-v0.1.0 were published on GitHub on September 29, 2026, with matching 0.1.0 packages on PyPI and npm.6 7 8

What it is useful for

Building MCP servers and MCP Apps that integrate with ChatGPT beyond what the standard MCP specification provides. The extensions target ChatGPT as the host; the specification lists which features each ChatGPT platform supports.1 3Fact reviewed Oct 4, 2026

Organization context

OpenAI

Provenance and derivatives

Builds on the Model Context Protocol and its MCP Apps extension, whose official SDKs it extends.3 4

Derived from: Model Context Protocol — The extensions are defined on top of the MCP specification and MCP Apps.

In the news

Dated, sourced updates in this catalog's news that mention this entry.

Sep 29, 2026 · Release
OpenAI publishes MCP Extensions, a specification and SDKs for ChatGPT plugins, under Apache 2.0
On September 29, 2026 OpenAI published the first releases, version 0.1.0, of the Python and Node SDKs for OpenAI MCP Extensions, a project that adds ChatGPT-specific capabilities to the Model Context Protocol so that plugins can work like native ChatGPT features. The repository's README highlights sidebar entrypoints, file extension handlers, composer mentions, and extended forms, and says the project is licensed under Apache 2.0. Version 0.2.0, released on October 10, 2026, adds editable chat drafts and forms that continue across multiple exchanges, and migrates the TypeScript server helpers to MCP SDK 2. The extensions take effect in ChatGPT, OpenAI's hosted product. USASI has not tested the SDKs.
- OpenAI
- OpenAI MCP Extensions

U.S. eligibility

Project eligibility rests on documented governing or maintaining entities, not on contributors.

Eligible · basis: U.S.-governed project

The repository is in OpenAI's GitHub organization, and the TypeScript package is published under OpenAI's @openai scope on npm with this repository as its source. See the openai organization record for OpenAI's U.S. headquarters.1 7

Assessed Oct 4, 2026

Sources

1.
openai/mcp-extensions repository and README (external site: github.com)
OpenAI (GitHub) · Repository · accessed Oct 4, 2026
2.
openai/mcp-extensions LICENSE (Apache-2.0) (external site: raw.githubusercontent.com)
OpenAI (GitHub) · License · accessed Oct 4, 2026
3.
OpenAI MCP Extensions Specification (external site: github.com)
OpenAI (GitHub) · Documentation · accessed Oct 4, 2026
4.
OpenAI MCP Extensions for TypeScript and JavaScript (README) (external site: github.com)
OpenAI (GitHub) · Documentation · accessed Oct 4, 2026
5.
OpenAI MCP Extensions for Python (README) (external site: github.com)
OpenAI (GitHub) · Documentation · accessed Oct 4, 2026
6.
openai/mcp-extensions releases (external site: github.com)
OpenAI (GitHub) · Release notes · accessed Oct 4, 2026
7.
@openai/mcp-extensions on npm (registry metadata) (external site: registry.npmjs.org)
npm · Documentation · accessed Oct 4, 2026
8.
openai-mcp-extensions on PyPI (JSON metadata) (external site: pypi.org)
Python Package Index · Documentation · accessed Oct 4, 2026

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Cite this page

APA style

USASI. (2026, October 4). OpenAI MCP Extensions. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/open/openai-mcp-extensions/

BibTeX

@misc{usasi_openai_mcp_extensions,
  author = {{USASI}},
  title = {OpenAI MCP Extensions},
  year = {2026},
  month = oct,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/open/openai-mcp-extensions/}},
  note = {United States of America Superintelligence. Last updated 2026-10-04}
}

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