Who can use a brain: access tiers

A brain has four tiers of access: Admin, Member, Client and Public. Each tier sees only the items set to its level, and the database enforces it.

The four tiers

Tier	Who it is for	What they see	How they get in
Admin	You, and any co-owner	The whole brain and every setting	Email and password, on every way in
Member	Your team	Items at Team, Client or Public level, their own personal space, and a chat with the team agent. No admin screens.	An invite link, then their own password. Web, desktop, phone app or MCP.
Client	People at your client company	Items at Client level, their own drafts and requests, and a chat with the client assistant	A sign-in link or an emailed code, no password. Web, phone app or MCP.
Public	Anyone with a link	The one item behind the link	A link you share. No login.

A member or client cannot change your brain. When they ask for a change, it comes to you as a request in Team > Requests.

Each item has a level: Admin, Team, Client or Public.

Every new item starts at Admin. Only an admin lowers a level, by hand.
Only workspace items go below Admin: pages, notes, drawings, tables, files, folders, apps and formulas. Email, journal, contacts, secrets, tasks and events stay at Admin.
Lowering a page also lowers what it shows: its images, embedded files and embedded drawings. A plain link to another item keeps its own level.
A client sees Client items only, not Public ones. A public item is reachable only by its own link.

Agents and tool groups have levels too. A member chats with the team agent only after you set that agent to Team level.

The rules sit in the database, not in each screen. A member or client gets the same answer in Jackdaw, the phone app and MCP.

To give	Do this
Admin	Settings > Logins > Add login, role Admin. See Member and client logins.
Member	Team > Invites, then set the team agent to Team level once. See Team and members.
Client	Team > Clients > Add client, then issue a sign-in link. See Member and client logins.
Public	Share the item to make a link. See Sharing and federation.

Set item levels before you let anyone in. Use Access in the header of a page, note, table, file, folder, drawing or app.

Settings > Logins: switch on Disabled to end a login and all its sessions at once.
Turn sharing off on an item and its public link stops at once. Team > Shared links lists every live link.