Where permission lives
A wiki belongs to one owner and can be shared with other users at three levels of trust. Membership is wiki-wide: a role carries the same rights on every page, and there is no per-page or per-block role.
Roles
The owner is implicit and cannot be removed. Every other member holds exactly one role, and a role is granted on the wiki, never on a page.
Viewer reads and nothing else
Reads. Equivalent to anonymous browsing on a public wiki, but with access to a private one.
Editor writes content, not settings
Reads and writes content — pages and blocks. Cannot change wiki settings or manage other members.
Admin is a deputy owner
Everything an editor does, plus changes the wiki's title, visibility, and language, and manages members. The closest thing to a deputy owner.
Adding and removing members
Open the gear icon (Manage) on the wiki. The Members section lists everyone with a role. Click "+ Add", search the user's display name, pick a role, confirm. To change a role later, click the current role next to the member and select a new one. "Remove" revokes their access entirely.
Users you invite must already have a Wikilayer account — email invites aren't supported yet.
How visibility fits in
Permissions answer who can do what. Visibility answers who can see the wiki at all. A public wiki is readable by anyone, members or not; a private one is invisible outside the member list. Archive hides the wiki everywhere except the owner's /manage.
Sharing one page
The owner or an admin can publish one ordinary page of a private wiki without opening the rest of the wiki. On the page, open Page actions (the … menu), turn on Public link under Share page, and copy the generated /p/… address.
The link is read-only and does not grant access to the wiki, sibling pages, editing, or settings. The menu also shows its view count after the first visit. Turn Public link off to revoke access; turning it on again restores the same stable address.
An agent can do the same with share_page(node_id=…, enabled=true) and revoke it with enabled=false. On an already-public wiki, the share address redirects to the normal page.