Chat SDK

Also read the TypeScript types from node_modules/chat/dist/ to understand the full API surface.

Quick start

import { Chat } from 'chat';
import { createSlackAdapter } from '@chat-adapter/slack';
import { createRedisState } from '@chat-adapter/state-redis';

const bot = new Chat({
  userName: 'mybot',
  adapters: {
    slack: createSlackAdapter({
      botToken: process.env.SLACK_BOT_TOKEN!,
      signingSecret: process.env.SLACK_SIGNING_SECRET!,
    }),
  },
  state: createRedisState({ url: process.env.REDIS_URL! }),
});

bot.onNewMention(async (thread) => {
  await thread.subscribe();
  await thread.post("Hello! I'm listening to this thread.");
});

bot.onSubscribedMessage(async (thread, message) => {
  await thread.post(`You said: ${message.text}`);
});

Core concepts

• Chat — main entry point, coordinates adapters and routes events
• Adapters — platform-specific (Slack, Teams, GChat, Discord, GitHub, Linear)
• State — pluggable persistence (Redis for prod, memory for dev)
• Thread — conversation thread with post(), subscribe(), startTyping()
• Message — normalized format with text, formatted (mdast AST), raw
• Channel — container for threads, supports listing and posting

Event handlers

Streaming

Pass any AsyncIterable<string> to thread.post(). Works with AI SDK's textStream:

import { ToolLoopAgent } from 'ai';
const agent = new ToolLoopAgent({ model: 'anthropic/claude-4.5-sonnet' });

bot.onNewMention(async (thread, message) => {
  const result = await agent.stream({ prompt: message.text });
  await thread.post(result.textStream);
});

Cards (JSX)

Set jsxImportSource: "chat" in tsconfig. Components: Card, CardText, Button, Actions, Fields, Field, Select, SelectOption, Image, Divider, LinkButton, Section, RadioSelect.

await thread.post(
  <Card title="Order #1234">
    <CardText>Your order has been received!</CardText>
    <Actions>
      <Button id="approve" style="primary">
        Approve
      </Button>
      <Button id="reject" style="danger">
        Reject
      </Button>
    </Actions>
  </Card>,
);

Packages

Changesets (Release Flow)

This monorepo uses Changesets for versioning and changelogs. Every PR that changes a package's behavior must include a changeset.

pnpm changeset
# → select affected package(s) (e.g. @chat-adapter/slack, chat)
# → choose bump type: patch (fixes), minor (features), major (breaking)
# → write a short summary for the CHANGELOG

This creates a file in .changeset/ — commit it with the PR. When merged to main, the Changesets GitHub Action opens a "Version Packages" PR to bump versions and update CHANGELOGs. Merging that PR publishes to npm.

Webhook setup

Each adapter exposes a webhook handler via bot.webhooks.{platform}. Wire these to your HTTP framework's routes (e.g. Next.js API routes, Hono, Express).