messenger_read_marker_apply

# messenger_read_marker_apply

Mark all messages of a direct room you own as read in the Messenger app (pApp D00003), as the Mark All Read button does when the read method is explicit [str_9053]. Requires roomUuid, confirmation MARK_DIRECT_ROOM_READ. The unread count disappears; members see the read indicator only when the settings show it [str_9054, str_9061]. No reply is sent. 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}$` |
| `change` | Yes | object |
| `change.confirmation` | Yes | `MARK_DIRECT_ROOM_READ` |
| `confirmToken` | No | string; pattern `^ct[a-f\d]{32}$`; The confirmToken from this tool's preview result. Omit it to preview; repeat the same input with it to execute. |