| Website chat | Public questions, lead intake, support entry, guided next steps | Keyboard and screen-reader access, link and attachment behavior, session continuity, visible source and error states | Supported answer, qualified record, ticket, or clear human path |
| Voice or phone agent | After-hours coverage, overflow, qualification, scheduling, status, routine service | Telephony, speech, interruption, silence, latency, pronunciation, disclosure, transfer, and callback tests | Confirmed booking or record, useful transfer, or safe callback |
| Messaging channel | Asynchronous updates, intake, reminders, routine questions | Channel policy, identity, consent, delivery, opt-out, timing, attachment, and delayed-response behavior | Delivered message, confirmed response, recorded next step, or owner handoff |
| Authenticated assistant | Customer or employee knowledge and connected account tasks | Login, role and record authorization, sensitive-data controls, session expiry, audit evidence, and recovery | Supported answer or destination-confirmed permitted action |
| Deterministic form or IVR | Known choices, fixed fields, stable routing, low ambiguity | Accessible structure, validation, explicit options, error recovery, and maintained routing rules | Complete validated record or deterministic transfer |