# Safe Writes

> How Safe Writes previews and confirms every change before it can touch a live ad account, and what the gateway will not do.

[Documentation](https://www.getmcpads.com/docs) / [Concepts](https://www.getmcpads.com/docs/concepts/discovery)

27 of the 185 tools change something. They are absent from the tool list on the Free plan, and refused if called anyway.

## Every write previews first

A write tool called without `confirm: true` changes nothing. It returns what it would do, in the units the platform expects, and stops. The same call repeated with `confirm: true` applies it.

The first call, and what comes back

```json
{ "customerId": "123-456-7890", "budgetId": "456", "dailyAmount": 75 }

{
  "applied": false,
  "action": "google_ads_update_campaign_budget",
  "change": { "customer": "1234567890", "budget": "456",
               "newDailyBudget": 75, "inMicros": 75000000 },
  "message": "Preview only, nothing was changed."
}
```

The preview exists because a model composes these calls. It can pick the wrong account, the wrong campaign, or the wrong order of magnitude on a budget. The preview turns an expensive mistake into a visible one.

## Amounts

You always give an amount in the account currency. The gateway converts to whatever the platform expects, and the preview shows both numbers so the conversion is auditable.

| Platform | Unit sent | 75 becomes |
| --- | --- | --- |
| Google Ads | micro units | 75000000 |
| Pinterest | micro currency | 75000000 |
| Meta | currency minor unit | 7500, or 75 on a currency with no minor unit |
| TikTok | the amount itself | 75 |

> **Warning** Amounts above 1,000,000 units are refused rather than sent. That ceiling exists to catch a double conversion, which otherwise reaches the platform as a valid request.

## What the gateway will not do

- Create a campaign in an active state. Creation is always PAUSED, with no option to override it.
- Delete anything. Pausing and archiving are available; deletion is not exposed.
- Duplicate a campaign, ad set or ad.
- Change targeting, bidding audiences, or creative content.
- Upload creative assets.

These are deliberate. On a hosted gateway that touches other people's accounts, those actions change spend in ways a text preview does not make obvious enough.

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