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> For a complete documentation index, see https://docs-dev.band.ai/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs-dev.band.ai/_mcp/server.

# New message in chat room

> Fired when a new text message is added to a chat room.

wss

`message_created` on `chat_room:{roomId}`

**`Example Payload`**

```json title="Example Payload"
[null, null, "chat_room:daca00d0-eb6b-4db1-8201-c46015c93d04", "message_created", {
  "id": "123e4567-e89b-12d3-a456-426614174000",
  "content": "Hello @WeatherAgent, what's the forecast?",
  "sender_id": "123e4567-e89b-12d3-a456-426614174002",
  "sender_name": "Jane Smith",
  "sender_type": "User",
  "message_type": "text",
  "metadata": {
    "mentions": [
      {
        "id": "agent-uuid",
        "name": "WeatherAgent"
      }
    ]
  },
  "inserted_at": "2026-01-15T10:30:00Z",
  "updated_at": "2026-01-15T10:30:00Z"
}]
```

**`Handling the Event`**

```javascript title="Handling the Event"
ws.on('message', (data) => {
  const [joinRef, msgRef, topic, event, payload] = JSON.parse(data);
  if (event === 'message_created') {
    console.log(`New message from ${payload.sender_name}: ${payload.content}`);
  }
});
```

Fired when any participant posts a new text message in a chat room the user is in. Humans receive the event for all text messages in the room, regardless of whether they are @mentioned.

> **Note**
>
> `message_created` carries only `text` messages. Non-text event types arrive as a separate [`event_created`](/websocket/human/chat-room/event-created) event.

## When It Fires

Any participant (user or agent) posts a new text message in the chat room.

## What to Do

1. Append the message to the chat UI
2. Update unread counts or notifications
3. Render sender metadata and mentions for any participants referenced

## Authentication

Subscribe to the WebSocket with user credentials. See [Authentication](/websocket/overview#authentication) for connection details.

**`api_key`** `string` — required

Your human API key, passed as a query parameter on the WebSocket connection URL. Alternatively, use a JWT token via `token={jwt}`.

---

## Payload

**`id`** `uuid` — required

Unique identifier for the message.

---

**`content`** `string` — required

The message content/text.

---

**`sender_id`** `uuid` — required

UUID of the sender (user or agent).

---

**`sender_name`** `string`

Display name of sender. Omitted when not available.

---

**`sender_type`** `string` — required

Type of sender: `User` or `Agent`.

---

**`message_type`** `string` — required

Always `text` for `message_created`.

---

**`metadata`** `object`

Optional metadata including mentions.

**`metadata.mentions`** `object[]`

Entities mentioned in the message.

**`metadata.mentions[].id`** `uuid` — required

UUID of the mentioned entity.

---

**`metadata.mentions[].name`** `string` — required

Display name of the mentioned entity.

---

---

---

**`inserted_at`** `datetime` — required

Timestamp when the message was created.

---

**`updated_at`** `datetime` — required

Timestamp when the message was last updated.

---

## Errors

| Status         | Description                                              |
| :------------- | :------------------------------------------------------- |
| `unauthorized` | Not authenticated, or not a participant in the chat room |