Take signups with a seat limit and a waitlist that moves on its own
Published 2026-10-22
Plenty of small teams run something with limited room: a monthly workshop, a product demo, a training class, office hours with a few slots. Signups usually come in through a generic form tool or a reply thread, and someone counts by hand. When a person cancels, the open seat stays open unless you remember who asked to be next and write to them. ChatGPT or Claude can draft the confirmation and the waitlist note. It cannot host the form, hold the count, or notice a cancellation at midnight.
What a chat cannot do alone
A chat has no public page that takes submissions and no record that outlives the conversation. It cannot enforce a limit, because it never sees the signups as they arrive. It cannot send mail from your address on its own, and it does nothing between messages, so a cancellation on Sunday waits until you open a chat on Monday. The result is usually an overbooked session or an empty seat.
What your assistant builds with Sails
Sails is a coding agent you connect over MCP, with cloud deployment built in. Your assistant writes the code and Sails runs it in the cloud. For this job it builds a few connected pieces.
A table of sessions, each with a date, a title, and a seat limit. A second table of signups records the person, their email, the session, a status of confirmed, waitlisted, or cancelled, and when they joined.
A signup form on your own domain. When someone submits it, the handler counts confirmed seats for that session. If there is room, the person is confirmed. If not, they join the waitlist in order. Either way they get an email from your mailbox right away, with a private cancel link.
The cancel link marks the signup as cancelled and promotes the first person on the waitlist, who gets a confirmation email of their own. Nobody has to step in.
A scheduled job written as ordinary shell code with no model in the loop. The day before each session it emails every confirmed person a reminder, and it sends you the final list with the waitlist below it.
Why it works
The seat count lives in one table, so the form, the cancel link, and the reminder all read the same numbers. Promotion happens in the same step as the cancellation, so a seat is never empty while someone is waiting. Every change is a row with a timestamp, which means you can always see who joined, who left, and who moved up. Because the tables stay in Sails, your assistant can add a new session or raise a limit in any later chat.
Hand it off
Copy this into your assistant:
Add Sails from https://sails.app/start. Build signups with a seat limit and a waitlist on my domain. Keep a table of sessions with a date, a title, and a seat limit, and a table of signups with name, email, session, status, and time joined. Host a signup form that confirms people while seats remain and waitlists them in order after that, and emails each person from my mailbox with a private cancel link. When someone cancels, promote the first waitlisted person and email them. Write a daily scheduled job in plain shell code with no model involved that sends reminders the day before each session and emails me the final list and waitlist. Show me how to add a session and change a limit. Ask me anything you need before you start.