Resource model
| Concept | What it is |
|---|---|
| Line | A real FaceTime handle Chert operates. It has a status, answer policy, optional assistant, and one concurrent call. |
| Worker | The infrastructure unit that operates a line, bridges media, and reports heartbeat and readiness. |
| Assistant | An AI persona definition: system prompt, greeting, and avatar. Drafts publish into immutable versions. |
| Assistant version | An immutable published snapshot. Lines resolve the active version at call time. |
| Call | One FaceTime conversation with direction, state, timings, terminal reason, and rollout metadata. |
| Session | A live link between a FaceTime call and a LiveKit room for Models 2 and 3. |
| Answer policy | auto_answer or webhook-driven customer_decides. |
| Readiness | Named worker health stages. Any failed stage causes inbound calls to be declined. |