# Message programs: broadcast, schedule

URL: /code/mcp/message/verbs · Id: `page:code/mcp/message/verbs`

> The Message Verbs broadcast, schedule as MCP do programs, with inputs, result, refusals and an example.

Reference for [Message](/business/nouns/message), one group of [Message programs](/code/mcp/message).

### Message.broadcast
Broadcast sends one Message to an Audience, now or at a set time, split by Variant when an Experiment runs. [Verb page](/business/nouns/message/broadcast?interface=mcp).

```text
do: return await $.Message.broadcast(input)
```

Emits [`Message.broadcasted`](/business/events/Message.broadcasted).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `message` | [Message](/business/nouns/message) | Yes | The Message to send. |
| `audience` | [Audience](/business/nouns/audience) | Yes | Who receives it. |
| `at` | `datetime` | No | When it goes out; omitted, now. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `messages` | list of [Message](/business/nouns/message) | Yes | One sent Message per Contact. |
| `message` | [Message](/business/nouns/message) | Yes | The Message broadcast. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Message.broadcast({ message: 'message_3Dg8ysSOyQ', audience: 'audience_vmVkEYrXCN' })"
  }
}
```

### Message.schedule
Schedule holds a Message until a set time and sends it then, unless it is canceled first. [Verb page](/business/nouns/message/schedule?interface=mcp).

```text
do: return await $.Message.schedule(input)
```

Emits [`Message.scheduled`](/business/events/Message.scheduled).

**Inputs**

| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `message` | [Message](/business/nouns/message) | Yes | The Message to hold. |
| `at` | `datetime` | Yes | When it goes out. |

**Returns**

| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `message` | [Message](/business/nouns/message) | Yes | The scheduled Message. |

**Refuses when**

| Check | Error | Fix | Then call |
| --- | --- | --- | --- |
| The key is valid, but its scopes do not allow this operation. | [`forbidden`](/code/api/errors/forbidden) | Use a key whose scopes cover the operation, or ask an owner of the namespace to grant them. | None. |

**Example**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Message.schedule({ message: 'message_3Dg8ysSOyQ', at: '2026-10-22T12:00:00Z' })"
  }
}
```