Show3D MCP · Visual guide

Connect Codex to Show3D

Install the Show3D plugin, authorize your account, and connect Codex to the modeling scene you have open. Codex CLI is not required.

Start setup Open Show3D modeling

Before you start

Have these three things ready. You do not need to configure an MCP server URL manually.

Codex desktop is open and signed in
You are signed in to Show3D in your browser
A Show3D modeling scene is created or open

Run the one-line installer

Keep Codex desktop open, choose your system, then paste and run the one-line command below in your terminal.

Open Terminal, paste the command, and press Return.

macOS / Linux

curl -fsSL https://www.show3d.com/codex/show3d/install.sh | sh

The command succeeded when your terminal says “marketplace has been registered with Codex.” Return to Codex and click Install on the Show3D plugin page that opens automatically.

Click Install in Codex

When the command finishes, Codex displays the Show3D plugin page automatically if it is already open. Click Install, then follow the authorization prompts.

Authorize your Show3D account

After clicking Install, follow the connection prompt in Codex to authorize your Show3D account in the browser.

1Your browser opens Show3D authorization. Sign in first if needed.
2Confirm the Show3D account and choose Allow connection.
3After the browser says Authentication complete, return to Codex and confirm authorization succeeded.

A 127.0.0.1 address is expected

This is a temporary local OAuth callback created by Codex. Close the tab after it says Authentication complete, and never share the code in the address bar.

Make the current scene available

After account authorization, Codex can connect only to a scene page that you actively have open.

1Open the scene you want to model in Show3D.
2Choose Agent MCP in the left sidebar.
3Make sure scene access is on and the status is green and connected.
4Keep this page open while Codex is modeling.

Closing the page, signing out, or switching scenes invalidates the old scene connection. This is scene-scoped access and does not revoke your Show3D account authorization.

Test the connection in Codex

Begin with a read-only test. Start modeling only after Codex can see the scene.

Send this to Codex

List my currently open Show3D scenes and connect the only scene. Do not modify the scene yet.

Codex successfully finds the current scene

The connection is ready when

Codex returns the current Show3D scene name or ID
Agent MCP remains connected on the Show3D page
The read-only test does not change the scene

Troubleshooting

The plugin page did not open after the command+

Open Codex, then run the same command again. If the page still does not appear, open Plugins in Codex, find Show3D, and click Install.

The authorization page keeps waiting or asks me to sign in+

Sign in to Show3D in the same browser, return to Codex, and start Connect again. Do not continue from an expired authorization page.

OAuth succeeded, but Codex cannot see a scene+

Keep the Show3D modeling page open, use the same account you authorized, and check the Agent MCP switch and connection status.

Why must I select the scene again after refreshing?+

A refresh creates a new editor session. List and select the current scene again in Codex; you do not need to authorize the account again.

How do I update Show3D later?+

Run the command for your system under “Run the one-line installer” again, then fully quit and reopen Codex.

Setup complete

Keep the Show3D scene page open. You can now return to Codex and start modeling.

Open Show3D modeling