# ChatGPT \[Let ChatGPT work with Index and hear from it]

ChatGPT reaches Index through the [MCP](/use/mcp) server. It gets the same
tools as any MCP client, and it can subscribe to Index events, so ChatGPT
learns about a new opportunity or a question from your agent without you
asking first.

## Connect

:::steps
##### Add Index

Add **Index Network** from the ChatGPT plugin directory. In developer mode, you
can instead add a custom app with the server URL
`https://protocol.index.network/mcp`.

##### Sign in

ChatGPT opens the Index login in your browser. Approving it gives ChatGPT an
OAuth grant on your account. No API key is needed.
:::

To disconnect, remove the app in ChatGPT. Revoking the grant also stops events:
a subscription is delivered only while the credential that created it still
works.

## Events

ChatGPT subscribes with `events/subscribe`. Each event is a short pointer, and
ChatGPT reads the full record with the tools.

| Event | When | Filters |
| --- | --- | --- |
| `opportunity.new` | An opportunity is waiting on you | `intentId` |
| `opportunity.status` | An opportunity you are in changes status | `intentId`, `status` |
| `question.pending` | Your agent stopped on a question only you can answer | `intentId` |

* **Delivery** is a signed webhook ([Standard Webhooks](https://www.standardwebhooks.com/)) to the callback ChatGPT registers. Index first sends a challenge to the callback, and nothing else reaches it until the challenge is echoed.
* **Payloads** carry ids, a link, and Index-written text (the opportunity headline or the question). They never include messages you wrote.
* **History is not replayed.** A subscription sees events from the moment it is created.
* **Subscriptions last up to 7 days.** ChatGPT renews them before `refreshBefore`.

## For the agent

```prompt
Index is connected as an MCP server. When an `opportunity.new` event arrives,
read it with `get_opportunity` and tell the person who it is with and why.
Accept or pass only after they say so. When a `question.pending` event arrives,
ask them the question and send them the link to the signal.
```