Resend adapter for Vercel Chat SDK

The official Resend adapter for Vercel Chat SDK turns email into a first-class channel for AI agents.

The @resend/chat-sdk-adapter package connects Resend to the Vercel Chat SDK. It's bidirectional: receive emails as chat messages via webhooks, send rich HTML emails back through the Chat SDK interface.

Features

• Email conversations automatically threaded using RFC headers (Message-ID, In-Reply-To, References)
• Inbound emails verified with Svix signatures
• Send styled HTML emails using React Email components, with plain text fallbacks
• Open source, MIT licensed

Quick look

import { Chat } from "chat";
import { MemoryStateAdapter } from "@chat-adapter/state-memory";
import { createResendAdapter } from "@resend/chat-sdk-adapter";

const resend = createResendAdapter({ fromAddress: "bot@example.com" });

const chat = new Chat({
  userName: "email-bot",
  adapters: { resend },
  state: new MemoryStateAdapter(),
});

chat.onNewMention(async (thread, message) => {
  await thread.subscribe();
  await thread.post(`Got your email: ${message.text}`);
});

What you can build

• Support bots that receive customer emails and reply with answers
• AI assistants that send order confirmations and handle follow-up replies
• Notification systems where users can reply directly to take action