ChatGPT - OnePerfectSlice

ChatGPT connects to the hosted OnePerfectSlice server as a custom connector. Sign-in happens in your browser via OAuth — there’s nothing to install.

Adding a custom MCP connector requires Developer Mode, available on paid plans (Plus, Pro, Team, Enterprise, Edu) and currently in beta. On Team/Enterprise/Edu, an admin may need to enable connectors for the workspace first.

Connect

Enable Developer Mode

In ChatGPT, go to Settings → Apps & Connectors → Advanced settings and turn on Developer Mode. This unlocks adding custom MCP servers with full tool access.

Add a custom connector

Back in Settings → Apps & Connectors, choose Create / Add custom connector and enter:

Name: OnePerfectSlice
MCP server URL: https://mcp.oneperfectslice.ai/mcp

Authenticate

When prompted, sign in to OnePerfectSlice and select the team whose data this connection should access. ChatGPT completes the OAuth flow and connects.

Use it

Enable the OnePerfectSlice connector in a chat (via the + / apps & connectors menu in the composer), then ask it to list your slices.

Test it

In a chat with the connector enabled, try:

Use OnePerfectSlice to list available slices

You should get back a list of your team’s slices.

Troubleshooting

Problem	Solution
No “custom connector” option	Turn on Developer Mode under Settings → Apps & Connectors → Advanced settings (Team/Enterprise/Edu may need an admin to enable connectors)
Connector won’t authorize	Re-run the sign-in and complete both login and team selection
Wrong team’s data	Remove the connector, re-add it, and select a different team
Tools not available in chat	Enable the connector from the chat’s tools/connectors menu

Switching teams

Each connection is scoped to one team. To switch, remove the connector and add it again, selecting the new team during sign-in.

​Connect

​Test it

​Troubleshooting

​Switching teams

Connect

Test it

Troubleshooting

Switching teams