Atlas
Atlas is searchable reference knowledge inside Studio: documentation indexed as a graph the agent can browse when it chooses. There is no @ mention and no / command for Atlas. You do not attach Atlas pages yourself; that is what Briefs (@brief) are for.
Some base bundled Atlas sources are made available out of the box to all.
How agents use it
The main agent (and subagents that keep the docs tools) call Atlas on their own when a question looks like it needs reference material (docs_query, then read a page). You can also steer them with an explicit ask in the prompt (“check Atlas for ESC8”). That is guidance to the model, not a composer mention.
Open Settings → Atlas, then Open the constellation to inspect the graph yourself. That view is for you to browse what was indexed; it is not how pages enter a chat.
Import ProTeamEnterprise
Extra bundled sources and importing your own (repo or docs site) are part of the paid plans. Settings → Atlas.
Ingested pages are data, not instructions: a page cannot override your approvals or tell the agent to ignore scope.
Cost
Atlas extracts only enter the window when the agent actually reads a node. Nothing accumulates until then.