Where are the gaps on Saturday, by instructor?
get_availabilityRead onlylist_staffRead only
A live read of open capacity, grouped the way the owner thinks about it.
Connector builds / For booking and scheduling software
The calendar answers in a sentence.
A Claude or ChatGPT connector for booking and scheduling software lets a studio owner, tour operator or clinic manager ask where the open slots are, move an appointment, hold spots for a group, or find clients who have not rebooked. Availability reads come live from your system, never cached. Every booking change shows the exact slot and the person affected, then waits for a yes. Xola, SimplyBook.me and Calendly already offer MCP servers, and I build yours on your API.
Nine of our tools are listed in Anthropic’s Claude directory.
At a glance
- Who asks
- Studio owners, front desks, tour operators
- First tools
- Availability, bookings, clients, staff
- Held for a yes
- Book, move, cancel, hold capacity
- Never cached
- Open slots: always read live
Checked October 12, 2026
What your customers would ask
The jobs they would do in Claude.
Reads answer at once. Anything that changes data drafts first and waits for a yes. Tool names here are illustrative: yours map to the real endpoints in your API docs.
Move Dana’s Tuesday 3pm to Thursday at the same time and let her know.
find_bookingRead onlyreschedule_bookingWrite, heldconfirm_actionApproval step
The new slot is checked for conflicts and shown in the business’s time zone before anything moves.
Hold six spots on the 14th for the Riverside school group.
hold_capacityWrite, held
A hold drafts first, so a mistyped date never blocks a real day of bookings.
Who came in last spring and has not booked since?
list_clientsRead only
The win-back list, without an export to a spreadsheet.
Design notes for this category
What I design around in booking.
Scheduling looks simple and is not. These are the decisions I make before the first tool exists:
- Fresh reads. Availability changes by the minute, so the availability tool always calls your API and never answers from a cache.
- Double booking. Every write re-checks the slot at confirm time, not just at draft time, because a real customer can book it in between.
- Time zones, stated. Every time the connector shows or writes is labeled with the business’s zone, since owners, staff and clients often sit in different ones.
- Notifications are writes. Telling a client their slot moved sends a message, so it sits behind the same approval step as the move itself.
Marketplaces and resellers
If you run a marketplace too.
Some booking platforms serve two audiences: the businesses that run the calendar and the resellers or guests who book into it. Those are two different connectors with two different sign-ins. If that is you, I scope it as a Connector Suite so both share one approval pattern and one security review, instead of two separate builds.
The category is moving
Already in the assistants in your category.
These companies publish official MCP servers today. Each line is read from the company’s own page, linked.
Xola
Runs an official MCP server for tour and activity booking, with 28 tools, connectable from Claude.
SimplyBook.me
Offers its own MCP connector for Claude.
Calendly
Announced an official hosted MCP server.
- Listed in Anthropic’s Claude directory
- 9
- In review with Anthropic
- 4
- In the official MCP Registry
- 15
- Tools Claude can call
- 69
What we have shipped
Built and running, not a deck.
Owner’s Desk
Our own OAuth 2.1 connector. It reaches the owner’s Stripe and Google accounts, every write waits for a confirm token, and every action lands in an audit log.
AI Front Door
One multi-tenant deploy that gives every business its own connector, white label, under an agency’s brand.
Small Business Agent Bench
Our open benchmark of how well AI agents handle real small-business work: 200 tasks, sandboxed tools, deterministic grading.
The package that fits
Connector Build
One scheduling product is a Connector Build. A business side and a reseller or guest side is Connector Suite.
Your customers do their real work in your product from inside the assistant they already use. Set scope, set price, quoted in the conversation, and changes to what we built are included.
Straight answers
What teams ask next.
Can a client book through the connector, or only staff?
Either, depending on who signs in. A staff connector reads and changes the business calendar; a client-facing one books into open slots for the signed-in client. Most companies start with the staff side.
How do you stop the assistant from double booking?
The write re-checks availability at the moment of confirmation, and refuses with a clear message if the slot was taken in the meantime.
Can it take deposits?
Not as a charge. Anthropic does not accept connectors that transfer money, so deposits stay in your product’s own checkout and the connector can share the link.
Sources
I wrote this page for Modern Mustard Seed, and we sell the service it describes. Every fact about Anthropic, OpenAI or another company was read from the page linked here on October 12, 2026.
One next step
Send me your API docs.
Tell me your product and where your API reference lives. I will come back with the jobs your customers would do in Claude and ChatGPT, the tools I would build, and the package that fits. Managed for you, end to end, and the code is yours.
Claude is a product of Anthropic, and ChatGPT is a product of OpenAI. Modern Mustard Seed is an independent studio and is not affiliated with or endorsed by either.