# create

URL: /business/nouns/trigger/create · Id: `verb:Trigger.create` · Call: `await $.Trigger.create({ … })` (SDK) or the `do` tool at `https://api.sb/mcp`. Inputs says what to pass, Outputs what returns, When it waits who approves.

> Creates a Trigger.

Create makes a new [Trigger](/business/nouns/trigger) from the inputs below. It is inherited: every [Noun](/business/nouns/noun) has `get`, `list`, `create`, `update` and `delete`.

## Inputs
| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `event` | `string` | No | The Event selector it matches, such as `Order.placed`. |
| `schedule` | `string` | No | A cadence or cron expression. |
| `where` | `string` | No | The predicate an `event` Trigger matches, such as `choice = 'raise'`. |
| `threshold` | `json` | No | A Metric staying below or above a value, optionally for a while, such as four weeks. |
| `at` | `string` | No | When in its cadence a schedule runs, on the namespace’s clock, such as `mon 09:00`. |

## Outputs
| Output | Type | Required | Description |
| --- | --- | --- | --- |
| `trigger` | [Trigger](/business/nouns/trigger) | Yes | The Trigger. |

## Effects
- Emits `Trigger.created`.
- Two-way: `try`, `send`, `do`.

## 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. | [Trigger.create](/business/nouns/trigger/create) |

## When it waits
| Gate | Default |
| --- | --- |
| Decision class | Low: two-way, nothing at stake |
| [Delay window](/systems/trust-and-governance/controls/one-way-windows) | None: it runs once review passes. |
| Limit | The call [Limit](/business/nouns/limit) of the [Permission](/business/nouns/permission) it runs under. |
| Over the Limit | It waits `pending` for an [Approval](/business/nouns/approval) from the [Founder](/agents/founding/founder). Approved, it runs; refused, it ends `refused` with [`limit-exceeded`](/code/api/errors/limit-exceeded); unanswered by its deadline, it ends `canceled`. |

## Example

**Ask**

```text
Add a trigger to QuietCopy.
```

**API**

```bash
curl -X POST https://api.sb/quietcopy.com/triggers \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"event":"Example event"}'
```

```json
{
  "api": "https://api.sb/quietcopy.com",
  "trigger": {
    "$id": "https://api.sb/quietcopy.com/triggers/trigger_1",
    "$type": "Trigger",
    "event": "Example event",
    "schedule": "Example schedule"
  },
  "action": {
    "$id": "https://api.sb/quietcopy.com/actions/action_1",
    "operation": "Trigger.create",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/quietcopy.com/actions/action_1"
  }
}
```

**SDK**

```ts
import { $ } from 'startup-builder'

const trigger = await $.Trigger.create({ event: 'Example event' })
```

**CLI**

```bash
npx startup-builder do Trigger.create --json '{"event":"Example event"}'
```

**MCP**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Trigger.create({ event: 'Example event' })"
  }
}
```

Guides that call it: [Automate a workflow](/workflows/automate-a-workflow), [Announce every release](/workflows/guides/announce-every-release).