"LINE inquiries about reservations, emails with questions — I can't keep up." Sound familiar?
We just shipped a demo for tasteck — a B2B SaaS for the Japanese night-leisure industry (men's esthetic salons, host clubs, etc.). The pitch isn't really about features. It's about running your shop without opening the UI.
The product video (1 minute)
What you see
- A salon owner has a customer's LINE message: "Hi, can I book 19:00 today for 60 min?"
- The owner copies the message into ChatGPT, says "book it."
- ChatGPT calls the tasteck MCP server, which returns a dry-run preview (shop, cast, time, course, payment).
- ★ Owner-approval modal pops up (this is the key part —
destructiveHint=truetriggers ChatGPT's built-in confirmation). - Owner approves → booking lands directly in the tasteck order screen.
The 18 MCP tools
The MCP server (Phase 2A) exposes the full SaaS workflow:
- 📋 Booking management — paste phone/LINE/email inquiries, get bookings
- 📅 Shift management — submit/confirm cast & driver shifts
- 📊 Sales analytics — daily / per-cast / nomination-rate visualization
- 👥 Guest & cast registration — add new entities by talking
- 🚗 Dispatch — auto-assign delivery drivers, send notification emails
All accessed through ChatGPT. No UI.
Why this matters (operationally)
The category is unusual: small-team SaaS where the owner is also the on-shift manager. Mode-switching between "running the floor" and "doing analytics" eats hours per day.
If the owner can hand off paste → preview → approve flows to AI, the cognitive load shifts back to actual business decisions — which cast to invest in, which shop to expand, how to drive nomination rate (本指名率) which is the LTV driver in this category.
Architecture notes
- MCP server in TypeScript on Express, sitting on existing TypeORM entities
- ChatGPT connector via OAuth + CIMD (Client ID Metadata Document)
- All write operations marked
destructiveHint: trueso ChatGPT shows the owner-approval modal - Write tools have
dry_run+appliedpattern (preview → confirm → execute) instead of single-shot mutations
We're getting early signal that "UI-less SaaS via MCP" is a useful positioning — especially for owner-operators who don't want to context-switch into yet another dashboard.
Try it
tasteck.tech — free trial available. Japanese only for now.
Would love feedback from anyone running multi-tool MCP servers in production — confirmation modal UX, write-tool patterns, and how to message "the SaaS your operators don't open" without sounding dystopian.
