messenger_room_thumbnail_replace_apply

# messenger_room_thumbnail_replace_apply

Replace a basic group's image in the Messenger app (pApp D00003). Requires confirmation REPLACE_GROUP_ROOM_THUMBNAIL. Write: other room settings stay unchanged; there is no reset to the default image. A lost receipt stays pending and is never resent; task_resume only observes, and prepared work needs the identical apply. Called without confirmToken it previews and returns a confirmToken; repeating the same input with it executes once.

## Inputs

| Field | Required here | Contract |
| --- | --- | --- |
| `target` | Yes | object |
| `target.roomUuid` | Yes | string; pattern `^[A-Za-z0-9_-]{1,200}$` |
| `target.uploadTaskId` | Yes | string; pattern `^[A-Za-z0-9_-]{8,80}$` |
| `change` | Yes | object |
| `change.confirmation` | Yes | `REPLACE_GROUP_ROOM_THUMBNAIL` |
| `confirmToken` | No | string; pattern `^ct[a-f\d]{32}$`; The confirmToken from this tool's preview result. Omit it to preview; repeat the same input with it to execute. |