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KINZEN
KINZEN

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Clinic AI receptionist

An AI phone and LINE receptionist for dental clinics, with code that checks replies against set rules. In pilot; go-live expected October 2026.

Period
May 2026 → present
Role
Solo build
Status
Pilot
Category
AI products

Work and results

  1. Deterministic checks in code review each draft before it reaches a patient, across voice, LINE and outbound recall, with rules that block diagnoses, dosing advice and cure claims.
  2. In a July 2026 test, 500 real customer messages ran through the LINE reply pipeline: the code checks caught 37 rule violations in raw model drafts, mostly overstated claims, and every final reply passed those checks in this test set.
  3. In pilot with a dental clinic, go-live expected October 2026. Production has run on a dedicated phone number since July 2026, with gated releases and one-step rollback.

Stack

  • TypeScript
  • Fastify
  • Twilio
  • LINE Messaging API
  • Gemini on Vertex AI
  • Claude
  • SQLite
  • Litestream
  • Fly.io

Architecture

KZ-01: Voice and LINE path through the reply rule checksFlow: Caller to Twilio; LINE user to LINE Messaging API; Twilio to Fastify service; LINE Messaging API to Fastify service; Fastify service to Model call; Model call to Reply rule checks; Outbound recall to Reply rule checks; Fastify service to SQLite; Reply rule checks to Reply; Reply to Caller; Reply to LINE user. Constraints: Checks each draft before it reaches a patient, with rules that block diagnoses, dosing advice and cure claims; July 2026 test, 500 real LINE messages: code checks caught 37 rule violations in raw drafts; Gated releases, one-step rollback; Silence frames injected server-side when the carrier suppresses silence; Dedicated phone number since July 2026; pilot, go-live expected October 2026.Fly.ioCallerphoneLINE userchatTwiliomedia streamLINE Messaging APIwebhookFastify serviceTypeScriptSQLiteLitestreamOutbound recallModel callGemini on Vertex AIClaude fallbackReply rule checksvoice, LINE, recallReplymodel draftReply goes back on the channel it came in onChecks each draft before itreaches a patient, with rulesthat block diagnoses, dosingadvice and cure claimsJuly 2026 test, 500 realLINE messages: codechecks caught 37 ruleviolations in raw draftsGated releases,one-step rollbackSilence frames injectedserver-side when the carriersuppresses silenceDedicated phone number since July 2026;pilot, go-live expected October 2026DrawingKZ-01Clinic AI receptionistScaleNot to scaleRevision2026-10Drawn byK. Khonthong
KZ-01Voice and LINE path through the reply rule checks

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