0n3
MCP servers · Gmail · connector · GPT action

Connect ChatGPT to Gmail

One line gives ChatGPT your Gmail account as tools: 13 endpoints, messages, drafts, labels, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.

Get the line for ChatGPTConnect Gmail first

Three steps

  1. Create a free 0n3 account and connect Gmail. Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into ChatGPT. A custom connector in Developer mode, or an Action on a custom GPT from the OpenAPI spec.
  3. Ask ChatGPT: whoami. Then: "List messages in Gmail".
Custom connector (needs Developer mode)
  1. Settings → Connectors (or Apps) → Advanced → Developer mode on
  2. Create → name 0n3 · MCP server URL https://0n3.app/mcp · Authentication: OAuth
  3. Finish the sign-in with your 0n account
  4. Enable the connector in a chat and ask: "whoami"

ChatGPT connectors cannot send a static header, so 0n3 signs you in through its OAuth door (dynamic client registration is on).

The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.

What ChatGPT can then do in Gmail

Messages · Read, search, and manage messages5
List messagesGET /users/me/messages
Get a messageGET /users/me/messages/{messageId}
Send a messagePOST /users/me/messages/send
Trash messagePOST /users/me/messages/{messageId}/trash
Untrash messagePOST /users/me/messages/{messageId}/untrash
Drafts · Create and manage drafts3
Create a draftPOST /users/me/drafts
List draftsGET /users/me/drafts
Send a draftPOST /users/me/drafts/send
Labels · Organize with labels2
List labelsGET /users/me/labels
Create a labelPOST /users/me/labels
Threads · View conversation threads2
List threadsGET /users/me/threads
Get a threadGET /users/me/threads/{threadId}
Send email · Send emails0
Send emails
More · Everything else this app exposes.1
Get a profileGET /users/me/profile

Gmail in other AI clients

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ChatGPT with other apps

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