---
title: Overview
description: API reference for the Chat SDK core package.
type: overview
---

Complete API reference for the `chat` package. All exports are available from the top-level import:

```typescript
import { Chat, root, paragraph, text, Card, Button, emoji } from "chat";
```

## Core

| Export | Description |
|--------|-------------|
| [`Chat`](/docs/api/chat) | Main class — registers adapters, event handlers, and webhook routing |
| [`Thread`](/docs/api/thread) | Conversation thread with methods for posting, subscribing, and state |
| [`Channel`](/docs/api/channel) | Channel/conversation container that holds threads |
| [`Message`](/docs/api/message) | Normalized message with text, AST, author, and metadata |
| [`ScheduledMessage`](/docs/api/thread#scheduledmessage) | Returned by `thread.schedule()` / `channel.schedule()` with `cancel()` |

## Utilities

| Export | Description |
|--------|-------------|
| [`toAiMessages`](/docs/api/to-ai-messages) | Convert `Message[]` to AI SDK `{ role, content }[]` format |

## Message formats

| Export | Description |
|--------|-------------|
| [`PostableMessage`](/docs/api/postable-message) | Union type accepted by `thread.post()` |
| [`Cards`](/docs/api/cards) | Rich card components — `Card`, `Text`, `Button`, `Actions`, etc. |
| [`Markdown`](/docs/api/markdown) | AST builder functions — `root`, `paragraph`, `text`, `strong`, etc. |
| [`Modals`](/docs/api/modals) | Modal form components — `Modal`, `TextInput`, `Select`, etc. |