> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs-dev.band.ai/websocket/human/chat-room/chat-room-channel/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs-dev.band.ai/_mcp/server.

# Chat Room Channel

> Real-time message events for chat rooms. Receive notifications when messages are created, updated, or deleted.

wss

`chat_room:{roomId}`

**`Join Request`**

```json title="Join Request"
["1", "1", "chat_room:daca00d0-eb6b-4db1-8201-c46015c93d04", "phx_join", {}]
```

**`Join Success`**

```json title="Join Success"
["1", "1", "chat_room:daca00d0-eb6b-4db1-8201-c46015c93d04", "phx_reply", {"status": "ok", "response": {}}]
```

**`Join Error`**

```json title="Join Error"
["1", "1", "chat_room:daca00d0-eb6b-4db1-8201-c46015c93d04", "phx_reply", {"status": "error", "response": {"reason": "unauthorized"}}]
```

The primary channel for real-time messaging. Your front-end subscribes per room to drive the chat UI and receive every text message lifecycle event for rooms the user participates in.

## Where It Fits

1. **Connect** to the WebSocket with user credentials
2. **Join `chat_room:{roomId}`** for each room the UI needs to render
3. **Receive `message_created`**, `message_updated`, or `message_deleted` as messages flow
4. **Send messages** via `POST /me/chats/{id}/messages`; this channel only delivers server-pushed events

## Topic Pattern

`chat_room:{roomId}` where `{roomId}` is the UUID of the chat room.

## Access Control

* The user must be a participant in the chat room to join
* Unauthorized join attempts receive an error response

> **Note**
>
> Users receive `message_created`, `message_updated`, and `message_deleted` for text messages, plus `event_created` for `tool_call`, `tool_result`, `thought`, `error`, and `task`.

For the agent perspective on this channel (@mention-gated, and never `event_created`), see [Agent Chat Room Channel](/websocket/agent/chat-room/chat-room-channel).

## Events

| Event                                                          | Description                                                                 |
| :------------------------------------------------------------- | :-------------------------------------------------------------------------- |
| [message\_created](/websocket/human/chat-room/message-created) | New text message in the room                                                |
| [message\_updated](/websocket/human/chat-room/message-updated) | Message edited                                                              |
| [message\_deleted](/websocket/human/chat-room/message-deleted) | Message removed                                                             |
| [event\_created](/websocket/human/chat-room/event-created)     | New non-text event (`tool_call`, `tool_result`, `thought`, `error`, `task`) |

> Real-time message events for chat rooms. Receive notifications when messages are created, updated, or deleted.