# Eve

[Eve](https://eve.dev/) is an open-source framework for building agents created by Vercel. It's filesystem-first, inspired by Next.js, and provides tools, workflows, connections, hooks, and channels for you to build long-running, durable agents.

Using the [Resend adapter for the Vercel Chat SDK](/guides/build-with-ai-chat-sdk) you can plug in email as a channel to your eve agent.

## Prerequisites

To get started, you'll need to:

- [Create an API key](https://resend.com/api-keys)
- [Verify your domain](https://resend.com/domains)
- [Set up webhooks](/guides/learn-webhooks-introduction) for `email.received` events
- [Enable receiving](/guides/learn-dashboard-receiving-introduction) on your domain

## Guide

:::::steps
::::step{title="Install"}
Create a new project with eve and then install the Chat SDK, the Resend adapter, and the development state adapter.

:::code-group
```bash npm theme={"theme":{"light":"github-light","dark":"vesper"}}
npx eve@latest init my-agent
cd my-agent
npm install @resend/chat-sdk-adapter chat @chat-adapter/state-memory
```

```bash yarn theme={"theme":{"light":"github-light","dark":"vesper"}}
yarn dlx eve@latest init my-agent
cd my-agent
yarn add @resend/chat-sdk-adapter chat @chat-adapter/state-memory
```

```bash pnpm theme={"theme":{"light":"github-light","dark":"vesper"}}
pnpm dlx eve@latest init my-agent
cd my-agent
pnpm add @resend/chat-sdk-adapter chat @chat-adapter/state-memory
```

```bash bun theme={"theme":{"light":"github-light","dark":"vesper"}}
bunx eve@latest init my-agent
cd my-agent
bun add @resend/chat-sdk-adapter chat @chat-adapter/state-memory
```
:::
::::

::::step{title="Configure the adapter"}
Create the Resend adapter with the [adapter configuration options](#configuration-options). Then create a Chat SDK channel with the adapter, a username for the bot, and an adapter state. `streaming` should be set to false as emails can only deliver one message per turn.

Export the `channel` object and the framework will integrate it automatically.

```ts theme={"theme":{"light":"github-light","dark":"vesper"}}
import { createResendAdapter } from '@resend/chat-sdk-adapter';
import { chatSdkChannel } from 'eve/channels/chat-sdk';
import { createMemoryState } from '@chat-adapter/state-memory';

export const resendAdapter = createResendAdapter({
  fromAddress: 'bot@example.com',
  fromName: 'My Bot',
});

export const { bot, channel, send } = chatSdkChannel({
  adapters: { resend: resendAdapter },
  userName: 'My Bot',
  state: createMemoryState(),
  streaming: false,
});

export default channel;
```

:::callout{intent="info"}
Set `RESEND_API_KEY` and `RESEND_WEBHOOK_SECRET` as environment variables. You can also pass `apiKey` and `webhookSecret` directly in the config passed to `createResendAdapter` — explicit values take precedence over env vars.
:::
::::

:::step{title="Handle new messages"}
Register handlers for incoming messages. `onNewMention` event fires when a new thread starts and `onSubscribedMessage` fires for follow-up emails in threads you are already subscribed to.

```ts theme={"theme":{"light":"github-light","dark":"vesper"}}
bot.onNewMention(async (thread, message) => {
  await thread.subscribe();
  await send(message.text, { thread });
});
bot.onSubscribedMessage(async (thread, message) => {
  await send(message.text, { thread });
});
```

Threading is handled by the [Chat SDK adapter](/guides/build-with-ai-chat-sdk#how-threading-works).
:::

:::step{title="Configure webhooks"}
Eve registers adapter endpoints at `/eve/v1/resend`. [Edit your webhook](/guides/learn-webhooks-introduction) for `email.received` events to point to this endpoint.
:::
:::::

## Configuration options

| Parameter       | Type     | Required | Description                                                           |
| --------------- | -------- | -------- | --------------------------------------------------------------------- |
| `fromAddress`   | `string` | Yes      | Sender email address                                                  |
| `fromName`      | `string` | No       | Display name for the From header                                      |
| `apiKey`        | `string` | No       | Resend API key. Falls back to `RESEND_API_KEY` env var                |
| `webhookSecret` | `string` | No       | Webhook signing secret. Falls back to `RESEND_WEBHOOK_SECRET` env var |

## Related pages

- [Chat SDK](./build-with-ai-chat-sdk.md)
- [Chat SDK Card Emails](./build-with-ai-chat-sdk-card-emails.md)
- [Chat SDK Attachments](./build-with-ai-chat-sdk-attachments.md)
- [Chat SDK Proactive Outreach](./build-with-ai-chat-sdk-proactive-outreach.md)

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