G-Guest MCP server

Book a table, an appointment or a place in a class at a real local business — from an AI assistant, with no API key and no account.

G-Guest is the booking system those businesses run on. This server exposes it to assistants over MCP: find a venue, read its real availability, and create a booking that is confirmed instantly and appears in the venue's own panel.

Endpoint — https://g-guest.app/api/mcp Transport — streamable HTTP (JSON-RPC 2.0 over POST) Auth — none. Reading and booking are open; a booking must carry the guest's name, phone and email.

Tools

Exact schemas: tools.json — generated from the live endpoint, not written by hand.

Related MCP server: Odybook MCP Server

Try it without installing anything

curl -s -X POST https://g-guest.app/api/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

A live demo venue is demo-studio (a pilates studio) and demo (a restaurant). Booking against those is real but harmless — they are ours.

Adding it to an assistant

• Claude, Codex, and custom agents — point them at the endpoint. Nothing to install.

• ChatGPT — add it as a connector (developer mode). Step-by-step, with what we have actually tested and what we have not: https://g-guest.app/ai

Honesty about what this is

Every venue reachable here is a paying or trialling customer of G-Guest, and a booking made through this server is a real reservation that a real business will honour. There is no marketplace in the middle and no commission on the booking.

We list only what we have tested ourselves. https://g-guest.app/ai says which assistants have actually created a confirmed booking here, and on what date.

Where the code lives

⚠️ This repository contains no server code, and never should. The MCP server is implemented inside the G-Guest application itself (private), and this repo is its public description: the endpoint, the tool schemas and the docs, so registries and assistants can find it. tools.json is regenerated from the live endpoint — if the two ever disagree, the live endpoint is right.

Links

• Service manifest — https://g-guest.app/.well-known/g-guest.json

• OpenAPI (plain HTTP, for agents without MCP) — https://g-guest.app/openapi.json

• What works today, per assistant — https://g-guest.app/ai

• G-Guest — https://g-guest.app

Made by G-Lab Studio.