# POST /settings

Apply a validated partial preference update.

This is a device HTTP route. Set `DEVICE_URL` to your reachable device URL; [connection and examples](https://mcp.applesauceos.com/doc/http.md) explain how. Do not append this path to the public MCP URL.

## Parameters

| Parameter | Type | Meaning |
| --- | --- | --- |
| `preference keys` | JSON object | Send only the keys to change; see supported keys below. |

## Response

Updated JSON preference snapshot; invalid values return 400.

## Example

```sh
curl --fail-with-body "$DEVICE_URL/settings" \
  -H 'Content-Type: application/json' \
  -d '{"keepAwake":true}'
```

## Notes

Boolean keys: avoidSafeMode, keepAwake, debugLog, helperEnabled, serverEnabled, inspectorShortcut, volumeStop, showIPInStatusBar, errorAlerts, scriptToasts. disabledHelperBundleIDs is an array of app identifiers. Reopen an app after a blacklist change. Disabling serverEnabled prevents new HTTP/MCP requests; re-enable it in the app. Restore temporary preferences after testing.

Check the HTTP status and any JSON error. [HTTP workflows and error handling](https://mcp.applesauceos.com/doc/http-guide.md) explain shared limits. [All endpoints](https://mcp.applesauceos.com/doc/http.md).