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MCP server · AI

Extensions

by · github.com/openai/mcp-extensions

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

Unclaimed Apache-2.0 ai
InstallView source
67Good

Scored 17 hours ago · breakdown

About Extensions

Extensions is an MCP server published by openai in the AI category: build plugins that feel like native, first-class features of ChatGPT.

The repository has 1.1K stars and 53 forks, with the last commit 8 days ago. Recent commit activity is the strongest signal that reported issues will get attention.

Install

Claude Code
claude mcp add extensions-385a -- npx -y @openai/mcp-extensions
npx
npx -y @openai/mcp-extensions

This server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.

Ask AI

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Ask AI about Extensions

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I know everything about Extensions. Ask me about installation, configuration, usage, or troubleshooting.

Security checks

Static checks derived from the repository 16 hours ago. Heuristics on the source, not an audit.

  • ✓README presentThe repository ships documentation.
  • ✓License declaredUsable under a stated license.
  • ✓Tests presentA test suite exists in the repository.
  • ✓Dependencies pinnedA lockfile pins dependency versions.

2 checks have not been run yet.

Releases

python-v0.2.0python: v0.2.0 · 10 Oct 20260.2.0 (2026-10-10) Features Update extension SDKs (#31)…
node-v0.2.0node: v0.2.0 · 10 Oct 20260.2.0 (2026-10-09) Features Update extension SDKs (#31)…
python-v0.1.0python: v0.1.0 · 29 Sep 20260.1.0 (2026-09-29) Documentation use relative SDK links (#3)…
node-v0.1.0node: v0.1.0 · 29 Sep 20260.1.0 (2026-09-29) Miscellaneous Chores prepare initial Python and Node releases (#6)…

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.

Try it out

  1. Install Bits & Bolts Remote.

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

  3. Open Extensions walkthrough to explore a demo of each major extension.

Showcase

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.

Get started

1. Integrate extensions

Ask @Plugin Creator in Codex to build a new plugin or improve an existing one for you.

2. Install the SDK

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

3. Learn more

4. Provide feedback

Notice any gaps in extensions for your plugin? Submit feedback here.

License

This project is licensed under the Apache License 2.0.

README fetched from the repository 16 hours ago. The original is authoritative.

Questions

About Extensions

How do I install Extensions?

Run claude mcp add extensions-385a -- npx -y @openai/mcp-extensions, then add the server to your MCP client's configuration.

Is Extensions safe to use with an AI agent?

Its trust score is 67 out of 100 (good). It passes 4 of the 4 static security checks run so far. It has no ConduID identity yet, so agent calls to it are not receipted.

Is Extensions still maintained?

Yes — the latest release is python-v0.2.0 (10 Oct 2026), and the last commit was 8 days ago. The repository has 1.1K stars and 12 open issues.