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ChatGPT supports custom MCP connectors through developer mode.

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Prerequisites

  • A Langmail account — sign up at app.langmail.me.
  • A ChatGPT plan with custom connectors (Plus, Pro, Business, Enterprise, or Edu). On Business and Enterprise workspaces, an admin must allow custom connectors first.

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Connect

1

Enable developer mode

Open Settings → Apps & Connectors (on some plans Connectors), scroll to Advanced settings, and turn on Developer mode.
2

Add the Langmail connector

Back in Apps & Connectors, choose Create and fill in:
  • Name: Langmail
  • MCP server URL: https://mcp.langmail.me/mcp
  • Authentication: OAuth
3

Authorize access

ChatGPT starts the authorization flow: sign in to your Langmail account and approve the consent screen.
4

Enable it in a chat

In a conversation, open the tools menu, choose Developer mode, and enable Langmail. The connector stays active for the rest of the conversation.

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Test it

Ask ChatGPT:
Prompt
It calls search_emails with { "mailbox": "Inbox", "limit": 5 } and answers from the result.

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Ending access

Remove the connector from Settings → Apps & Connectors. Removing it discards its tokens; without the refresh token, access lapses when the current access token expires.

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Next steps

Search and triage email

Real prompts and the tool calls they produce.

How authorization works

What happens between “add connector” and “connected”.