Workspaces and real-time collaboration

Invite teammates into a workspace and collaborate on the same Markdown documents, folders, and Assets.

Letter.md workspaces now provide a clear ownership and collaboration boundary for a body of work.

What changed

Invite people into a workspace with scoped roles and permissions.
Edit the same Markdown document together through real-time collaboration.
Keep documents, folders, Assets, publications, and storage under one workspace.
Share individual documents or folders without exposing unrelated content.
Recover local edits when a connection is interrupted and synchronize them after reconnecting.

Workspace membership and public publishing remain separate permissions.