URL: /code/apps/social/create · Id: `page:/code/apps/social/create`

# Post.create

> Saves a Post as a draft for one account, with its format and the claims it makes.

POST https://api.sb/{your-domain}/posts

Saves a [Post](https://startupbuilder.dev/business/nouns/post) as a draft for one [account](https://startupbuilder.dev/business/nouns/handle), with its format and the claims it makes.

- **Action class:** None
- **Approval:** Runs on its own
- **Emits:** `Post.created`
- **Price:** Free

```text title="Run it · Ask"
Draft a LinkedIn text post for Tuesday 9am Central about the 60-day renewal checklist.
```

```ts title="Run it · SDK"
import { $ } from 'startup-builder'

const result = await $.try.Post.create({ format: 'text', publishAt: '2026-11-03T15:00:00Z', handle: 'https://api.sb/leaseline.app/handles/handle_Li9fB3wE6y' })
```

```json title="Run it · Response"
{
  "api": "https://api.sb/leaseline.app",
  "post": {
    "$id": "https://api.sb/leaseline.app/posts/post_Nw3cK7lT1v",
    "$type": "Post",
    "format": "text",
    "status": "draft",
    "publishAt": "2026-11-03T15:00:00Z"
  },
  "action": {
    "operation": "Post.create",
    "mode": "try",
    "status": "done"
  }
}
```

It extends the hub’s record call [`Post.create`](https://startupbuilder.dev/business/nouns/post/create), which every [Post](https://startupbuilder.dev/business/nouns/post) takes. It is one of the [Verbs](https://startupbuilder.dev/business/nouns/verb) of [Social](/code/apps/social#verbs).

## Inputs
| Name | Type | Meaning |
| --- | --- | --- |
| `format` | `string` | Required. The venue’s format, such as `shortVideo` or `thread`. |
| `publishAt` | `datetime` | When it goes out. Optional. |
| `claims` | `json` | The facts it states, each resolving to a record. Optional. |
| `reach` | `integer` | How many people saw it, as the venue reports. Optional. |
| `handle` | `Handle` | Every Post goes out from one account, so its reach and replies count toward that account. Optional. |

The hub inherits this call on every Noun: it takes the Post’s own Properties, listed on [the hub’s Post page](https://startupbuilder.dev/business/nouns/post).

## Outputs
| Field | Type | What `null` means |
| --- | --- | --- |
| `post` | `Post` | Never null: the Post as the call leaves it. |

## Effects
**Action class**

None: no approval rule names it, so it runs within its seat’s Permissions and Limits

**Modes**

- `try`: Runs every check and returns the record as it would be; nothing is stored.
- `send`: Returns a pending Action at once; `Post.created` fires when it is done.
- `do`: Waits for the Action to finish and returns the record.

**Idempotency**

Only with a key: the same `Idempotency-Key` and input return the first Action, and the same key with other input returns `409`.

**Saved or shared**

The Post is saved as the call leaves it, with the Action that changed it.

**Emits**

`Post.created` with `{ post }`

**Performed by**

Whichever seat calls it

**Price**

Free on your own account: the platform charges nothing for the call.

## On each Venue
It acts on your own records and reaches no Venue, so every account answers the same way.

## What try does
Runs every check the call meets and returns the record as it would be; nothing is stored, sent or posted.

## Refuses when
The hub sets no guard of its own on this call: it refuses only on the shared checks every write meets (a missing record, a Permission the seat lacks).

## When it waits
Returns in one response; nothing waits.

## Example
In `send` mode the call returns its pending Action at once, and `Post.created` delivers the result.

**Ask**

```text
Draft a LinkedIn text post for Tuesday 9am Central about the 60-day
renewal checklist.
```

**API**

```bash
curl -X POST "https://api.sb/leaseline.app/posts?mode=send" \
  -H "Authorization: Bearer $SB_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
  "format": "text",
  "publishAt": "2026-11-03T15:00:00Z",
  "handle": "https://api.sb/leaseline.app/handles/handle_Li9fB3wE6y"
}'
```

**CLI**

```bash
npx startup-builder do Post.create --send --data '{
  "format": "text",
  "publishAt": "2026-11-03T15:00:00Z",
  "handle": "https://api.sb/leaseline.app/handles/handle_Li9fB3wE6y"
}'
```

`--send` returns the pending Action at once.

**MCP**

```json
{
  "name": "do",
  "arguments": {
    "mode": "send",
    "code": "return await $.Post.create({ format: 'text', publishAt: '2026-11-03T15:00:00Z', handle: 'https://api.sb/leaseline.app/handles/handle_Li9fB3wE6y' })"
  }
}
```

**SDK**

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

const result = await $.send.Post.create({
  format: 'text',
  publishAt: '2026-11-03T15:00:00Z',
  handle: 'https://api.sb/leaseline.app/handles/handle_Li9fB3wE6y',
})
```


```json title="Response, in send mode"
{
  "mode": "send",
  "action": {
    "$id": "https://api.sb/leaseline.app/actions/action_Sd3kQ9vT2w",
    "operation": "Post.create",
    "status": "pending",
    "reason": "running"
  }
}
```

To retry, send the same `Idempotency-Key`: the retry returns the first answer for $0. A new key reads again.

## Used by
None.

## Related
[`Post.publish`](/code/apps/social/publish) · [`Post.schedule`](/code/apps/social/schedule) · [`Post.withdraw`](/code/apps/social/withdraw) · [`Post.update`](/code/apps/social/update)