URL: /code/apps/crm/lose · Id: `page:/code/apps/crm/lose`

# Deal.lose

> Closes a deal as lost, with the reason the buyer gave.

POST https://api.sb/{your-domain}/deals/{deal}/lose

Closes a [deal](https://startupbuilder.dev/business/nouns/deal) as lost, with the reason the buyer gave.

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

```text title="Run it · Ask"
Close the Crestline deal as lost: they renewed their current software.
```

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

const result = await $.try.Deal.lose({ deal: 'https://api.sb/leaseline.app/deals/deal_Cr3sT1nE9w', reason: 'Renewed their current software for a year.' })
```

```json title="Run it · Response"
{
  "api": "https://api.sb/leaseline.app",
  "deal": {
    "$id": "https://api.sb/leaseline.app/deals/deal_Cr3sT1nE9w",
    "$type": "Deal",
    "status": "lost",
    "reason": "Renewed their current software for a year."
  },
  "action": {
    "operation": "Deal.lose",
    "mode": "try",
    "status": "done"
  }
}
```

Its Inputs, Outputs, Effects and guards quote [the hub’s `Deal.lose`](https://startupbuilder.dev/business/nouns/deal/lose); this page adds what each Venue honors, its limits and a worked call. It is one of the [Verbs](https://startupbuilder.dev/business/nouns/verb) of [CRM](/code/apps/crm#verbs).

## Inputs
| Name | Type | Default | Meaning |
| --- | --- | --- | --- |
| `deal` | `Deal` | Required | The open deal. |
| `reason` | `text` | Required | Why the buyer passed. |

## Outputs
| Field | Type | What `null` means |
| --- | --- | --- |
| `deal` | `Deal` | Never null: the lost deal. |

## 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; `Deal.lost` 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 deal is saved as the call leaves it, with the Action that changed it.

**Emits**

`Deal.lost` with `{ deal }`

**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 `Deal.lost` delivers the result.

**Ask**

```text
Close the Crestline deal as lost: they renewed their current software.
```

**API**

```bash
curl -X POST "https://api.sb/leaseline.app/deals/deal_Cr3sT1nE9w/lose?mode=send" \
  -H "Authorization: Bearer $SB_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
  "reason": "Renewed their current software for a year."
}'
```

**CLI**

```bash
npx startup-builder do Deal.lose --send --data '{
  "reason": "Renewed their current software for a year."
}'
```

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

**MCP**

```json
{
  "name": "do",
  "arguments": {
    "mode": "send",
    "code": "return await $.Deal.lose({ reason: 'Renewed their current software for a year.' })"
  }
}
```

**SDK**

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

const result = await $.send.Deal.lose({
  deal: 'https://api.sb/leaseline.app/deals/deal_Cr3sT1nE9w',
  reason: 'Renewed their current software for a year.',
})
```


```json title="Response, in send mode"
{
  "mode": "send",
  "action": {
    "$id": "https://api.sb/leaseline.app/actions/action_Sd3kQ9vT2w",
    "operation": "Deal.lose",
    "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
[`Lead.qualify`](/code/apps/crm/qualify) · [`Lead.assign`](/code/apps/crm/assign-lead) · [`Deal.advance`](/code/apps/crm/advance) · [`Deal.win`](/code/apps/crm/win) · [`Lead.nurture`](/code/apps/crm/nurture) · [`Lead.convert`](/code/apps/crm/convert) · [`Lead.disqualify`](/code/apps/crm/disqualify) · [`Deal.assign`](/code/apps/crm/assign-deal) · [`Deal.propose`](/code/apps/crm/propose) · [`Contact.merge`](/code/apps/crm/merge-contact) · [`Organization.merge`](/code/apps/crm/merge-organization)