Default Omni.Session.Manager shipped with Omni.UI.

Configure the store under the :omni_ui app and add the module to your application supervision tree:

# config/config.exs
config :omni_ui, Omni.UI.Sessions,
  sessions_base_dir: "/absolute/path/to/sessions",
  store:
    {Omni.Session.Stores.FileSystem,
     base_dir: "/absolute/path/to/sessions"},
  title_generator: {:anthropic, "claude-haiku-4-5"}

# application.ex
children = [Omni.UI.Sessions]

Start-time opts override app-env values, so a host app can compute config at boot when needed.

Consumers wanting multiple Managers (e.g. multi-tenant isolation) define their own modules — defmodule MyApp.Sessions, do: use Omni.Session.Manager, otp_app: :my_app — and pass them to Omni.UI.attach_session/2 via the :manager option.