# create

URL: /business/nouns/exposure/create · Id: `verb:Exposure.create` · Call: `await $.Exposure.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 an Exposure.

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

## Inputs
| Input | Type | Required | Description |
| --- | --- | --- | --- |
| `unit` | `string` | Yes | What was randomized: a Visitor, a Customer, a request, or an agent choice. |
| `options` | `json` | Yes | Every Variant that was possible at that moment. |
| `propensity` | `number` | Yes | The probability the assigned Variant had, kept for later estimates. |
| `at` | `datetime` | Yes | When the unit met the Variant. |
| `triggered` | `boolean` | No | True when the unit reached the point the Variant changes. |
| `variant` | [Variant](/business/nouns/variant) | No | The Variant the Flag assigned to this unit. |

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

## Effects
- Emits `Exposure.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. | [Exposure.create](/business/nouns/exposure/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 an exposure to ShiftNote.
```

**API**

```bash
curl -X POST https://api.sb/shiftnote.app/exposures \
  -H "Authorization: Bearer $STARTUP_BUILDER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"unit":"Example unit","options":{},"propensity":1,"at":"2026-10-22T12:00:00Z"}'
```

```json
{
  "api": "https://api.sb/shiftnote.app",
  "exposure": {
    "$id": "https://api.sb/shiftnote.app/exposures/exposure_1",
    "$type": "Exposure",
    "unit": "Example unit",
    "options": {},
    "propensity": 1,
    "at": "2026-10-22T12:00:00Z"
  },
  "action": {
    "$id": "https://api.sb/shiftnote.app/actions/action_1",
    "operation": "Exposure.create",
    "status": "done"
  },
  "links": {
    "self": "https://api.sb/shiftnote.app/actions/action_1"
  }
}
```

**SDK**

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

const exposure = await $.Exposure.create({ unit: 'Example unit', options: {}, propensity: 1, at: '2026-10-22T12:00:00Z' })
```

**CLI**

```bash
npx startup-builder do Exposure.create --json '{"unit":"Example unit","options":{},"propensity":1,"at":"2026-10-22T12:00:00Z"}'
```

**MCP**

```json
{
  "name": "do",
  "arguments": {
    "code": "return await $.Exposure.create({ unit: 'Example unit', options: {}, propensity: 1, at: '2026-10-22T12:00:00Z' })"
  }
}
```