Capabilities
Group
Domain group: states, services, device classes and features.
Entity ids in this domain look like group.<object_id>.
Use in preferences
{ key: 'device', label: 'Device', type: 'entity', domainFilter: 'group', required: true }States
Open-ended — this domain reports free-form values (numbers or strings). Subscribe with {} or an attribute filter and compare inside the handler.
Services
Also routable (GroupServices), not in the wizard catalog — callable as entity.<service>(); the integration may reject unsupported ones at runtime:
removeGroup, setGroup