ChatGPT Custom MCP Server
Add Betterness or Betterness One to ChatGPT with developer mode.
What you need
- ChatGPT on the web, on a plan with developer mode: Plus, Pro, Business, Enterprise or Edu. In a Business, Enterprise or Edu workspace, an admin may have to allow developer mode and custom MCP servers first.
- A Betterness account. For Betterness One, a Betterness One workspace.
ChatGPT signs in with OAuth only: it cannot send a bk_* or bko_* key.
Server URLs
| Name | URL |
|---|---|
Betterness | https://api.betterness.ai/mcp |
Betterness One | https://api.betterness.one/mcp |
1. Turn on developer mode
In ChatGPT Settings, turn on Developer mode. ChatGPT has moved this switch between releases (it has lived under Security and login and under Apps → Advanced settings); if you do not see it, search Settings for "Developer mode".
2. Add the server
- Open Plugins (
chatgpt.com/plugins). - Select +, then Add custom MCP server.
- Enter the name and, optionally, a description. Under Connection, enter the URL from the table.
- For authentication, choose OAuth. Leave the client fields empty: ChatGPT registers itself.
- Review the risk warning and select I understand and want to continue.
- Select Create as a plugin, then install the plugin.
- ChatGPT opens the Betterness sign-in page at
auth.betterness.ai. Sign in and accept the permissions.
3. Use it in a chat
In a new conversation, type @ in the prompt box and select the plugin. Name the task plainly, e.g. "@Betterness One which of my Instagram posts did best last month?"
ChatGPT asks you to confirm every tool that changes something. Purchases, appointments, Inbox messages and posts also show a Betterness preview first and run only after you approve it.
After an update
When Betterness adds or changes tools, open the plugin's page in ChatGPT and select Refresh, then start a new conversation.
Remove it
Remove the plugin from its page in ChatGPT. To withdraw access from the Betterness side as well, disconnect ChatGPT in Connected apps.
What could go wrong
| Symptom | What to do |
|---|---|
| No Add custom MCP server option | Developer mode is off, your plan does not include it, or your workspace admin has not allowed it |
| "Unable to process redirect callback" while signing in | The sign-in took too long or was sent twice. Start the connection again. |
| ChatGPT does not call the tool | Select the plugin with @ and name the task explicitly |