## Answer a command

`POST /v1/bots/:botId/commands/:commandId/answer`

Sends a reply to a slash-command invocation. Call it from the `ONIMBOTV2COMMANDADD` event handler.

## Request fields (body)

| Parameter | Type | Required | Description |
|----------|-----|:-----:|---------|
| `messageId` | number | yes | ID of the message that invoked the command (from the event) |
| `dialogId` | string | yes | Dialog ID. For a group chat — `chat{chatId}`, for a private chat — `{userId}`. Take it from the `ONIMBOTV2COMMANDADD` event (`PARAMS.DIALOG_ID`) |
| `fields` | object | no | Reply message fields |
| `fields.message` | string | no | Reply text. Supports [BB-codes](/docs/bots/messages/formatting) |
| `fields.keyboard` | array | no | Interactive [keyboard](/docs/bots/messages/keyboard) |
| `fields.attach` | array/object | no | [ATTACH blocks](/docs/bots/messages/attach) |
| `fields.system` | boolean | no | System message. Defaults to `false` |
| `fields.urlPreview` | boolean | no | Show link previews. Defaults to `true` |

## Examples

### curl — personal key

```bash
curl -X POST https://vibecode.bitrix24.com/v1/bots/42/commands/7/answer \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "messageId": 1510,
    "dialogId": "chat123",
    "fields": {
      "message": "[b]Task help[/b]\n\nAvailable actions:\n[SEND=/status]Check status[/SEND]\n[SEND=/create]Create task[/SEND]"
    }
  }'
```

### curl — OAuth application

```bash
curl -X POST https://vibecode.bitrix24.com/v1/bots/42/commands/7/answer \
  -H "X-Api-Key: YOUR_APP_KEY" \
  -H "Authorization: Bearer USER_SESSION_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "messageId": 1510,
    "dialogId": "chat123",
    "fields": {
      "message": "[b]Task help[/b]\n\nAvailable actions:\n[SEND=/status]Check status[/SEND]\n[SEND=/create]Create task[/SEND]"
    }
  }'
```

### JavaScript — personal key

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/bots/42/commands/7/answer', {
  method: 'POST',
  headers: {
    'X-Api-Key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    messageId: 1510,
    dialogId: 'chat123',
    fields: {
      message: '[b]Task help[/b]\n\nAvailable actions:\n[SEND=/status]Check status[/SEND]',
    },
  }),
})

const { success, data } = await res.json()
```

### JavaScript — OAuth application

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/bots/42/commands/7/answer', {
  method: 'POST',
  headers: {
    'X-Api-Key': 'YOUR_APP_KEY',
    'Authorization': 'Bearer USER_SESSION_TOKEN',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    messageId: 1510,
    dialogId: 'chat123',
    fields: {
      message: '[b]Task help[/b]\n\nAvailable actions:\n[SEND=/status]Check status[/SEND]',
    },
  }),
})

const { success, data } = await res.json()
```

## Response fields

| Field | Type | Description |
|------|-----|---------|
| `data.result` | boolean | `true` when the reply was sent successfully |

## Response example

```json
{
  "success": true,
  "data": {
    "result": true
  }
}
```

## Error response example

404 — bot not found:

```json
{
  "success": false,
  "error": {
    "code": "BOT_NOT_FOUND",
    "message": "Bot 999 not found. Register it first via POST /v1/bots."
  }
}
```

## Errors

| HTTP | Code | Description |
|------|-----|---------|
| 400 | `INVALID_BOT_ID` | `botId` is not a number |
| 404 | `BOT_NOT_FOUND` | No bot found with this ID |
| 403 | `BOT_ACCESS_DENIED` | The bot belongs to a different API key |
| 422 | `BITRIX_ERROR` | Bitrix24 error (error text in `message`) |
| 403 | `SCOPE_DENIED` | API key lacks the `imbot` scope |
| 401 | `TOKEN_MISSING` | API key has no configured tokens |

Full list of common API errors — [Errors](/docs/errors).

## Known specifics

**No chat membership required:** the bot can answer a command even if it is not a participant of the chat. Access is granted temporarily through the `messageId` + `commandId` pair. If the bot is not a participant, the reply is sent as a system message under the bot's name.

## See also

- [Register a command](/docs/bots/commands/register)
- [Events](/docs/bots/events)
- [Text formatting](/docs/bots/messages/formatting)
- [Keyboard](/docs/bots/messages/keyboard)
- [Bot platform](/docs/bots)
- [Limits and optimization](/docs/optimization)