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You can connect ChatGPT to Lightsage MCP with Lightsage’s public OAuth client. You will sign in with your Lightsage account and choose which organization the connection can access. You do not need a Lightsage API key or an OAuth client secret.
1

Enable developer mode

Open Settings → Security and login and turn on Developer mode.
2

Open the New Plugin dialog

Click Create a new ChatGPT plugin to open the New Plugin dialog directly.
3

Enter the Lightsage MCP server

Set Name to Lightsage MCP and enter this MCP Server URL:
Set Authentication to OAuth.
4

Configure the public OAuth client

Open Advanced OAuth settings and configure:Select these default scopes:
Leave the discovered authorization, token, resource, and OpenID endpoints unchanged.
The client ID is a public identifier, not a secret. Do not enter a client secret.
5

Verify the callback URL

Confirm that ChatGPT displays this callback URL in Advanced OAuth settings:
If ChatGPT displays a different callback URL, do not create the connector. Contact Lightsage support so the callback can be added to the OAuth client.
6

Create the connector

Check I understand and want to continue, then click Create.
7

Sign in and authorize

ChatGPT opens a Lightsage sign-in window:
  1. Sign in with your Lightsage account (the same login you use for the dashboard).
  2. Choose the organization this connection should access.
  3. Review the requested permissions and approve.
ChatGPT receives an access token scoped to the organization you selected. The connection can only act on that organization.
8

Test the connection

Enable the Lightsage connector in a chat, then run a read-only prompt:
Lightsage is also preparing a published ChatGPT plugin that will remove the manual OAuth configuration steps. See Connect from ChatGPT and Apps SDK authentication.