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Human in the Loop with Contracts

· 14 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO
About this post

This is a technical implementation note about the AI assistant architecture in Curling IO v3. It is written for software engineers and others designing agent systems, and goes deeper into Rust, persistence, authorization, and failure handling than our usual product posts.

The usual human-in-the-loop AI agent pattern goes something like this: the model requests a tool call, the agent runtime pauses, a human approves the call, and the runtime resumes so the tool can execute.

That is a reasonable general-purpose design. It is also stricter than simply letting an agent call every tool it can see. For Curling IO, we wanted to expose the smallest possible surface to the model and put an application-owned guardrail around every path to a write. That led us to a stricter question:

If the application already has the exact call details, why hand control back to the agent at all?

By the time we ask a club manager to approve an operation, Curling IO has parsed the model's request, resolved every default, checked the current application state, produced a fixed preview, and stored the exact arguments. The model has nothing useful left to contribute to execution, so we do not let it execute the operation or resume it merely to carry out the approval.

The agent proposes. The application turns that proposal into a contract. The human approves the contract. Rust executes it.

In-app Assistance in Curling IO

· 8 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

This post is part of our Curling IO v3 sneak peek series, where we explore some of the new features available in the upcoming version.

Curling IO v3 includes optional in-app assistance for most tasks a club manager does. It appears within the section where the work is happening and uses the context needed for that work.

An assistant can investigate a problem, explain what it finds, and prepare an operation for review. It performs that operation only after an administrator explicitly approves it.

Send Curling IO Purchases to Zapier or n8n

· 5 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

This post is part of our Curling IO v3 sneak peek series, where we explore some of the new features available in the upcoming version.

Clubs often need to send purchase information to systems outside Curling IO. That might mean updating a spreadsheet, notifying staff, or starting a workflow in another service.

Rentals are one example. Someone may need to prepare the lounge, reserve tables, arrange catering, or add the booking to a staff spreadsheet.

Curling IO v3 webhooks can send that product purchase to Zapier, n8n, or another HTTPS endpoint when it is submitted, paid, cancelled, or rescheduled.

Optimizing Curling Draw Schedules

· 26 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

This post is part of our Curling IO v3 sneak peek series, where we explore some of the new features available in the upcoming version.

Curling IO v3 includes a new draw scheduling screen for event games. The schedule is a grid of draws and club resources, with unassigned games kept in a queue beside it. You can drag and drop games, lock specific placements, and use Allocate and Optimize around those locks.

Unlike a separate schedule template generator, this editor works with the event's actual teams, stages, games, resources, and draw times. Saving the schedule updates the event directly.

You can try most of the scheduling interface now at CurlingSchedules.com. It uses generic teams and browser-local saves instead of an event's actual games, but the grid, drag-and-drop editing, locks, catalog schedules, fairness inspection, and optimization are available today.

Renting Your Ice with Curling IO

· 8 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

This post is part of our Curling IO v3 sneak peek series, where we explore some of the new features available in the upcoming version.

Curling clubs use rentals for practice ice, lounges, meeting rooms, and other bookable resources they define. A rental needs a product and price, but it also needs a schedule, one or more resources, public availability, and a booking record after checkout.

In Curling IO v3, an administrator defines the rental schedule and resources in the admin area. Available time slots appear on the public calendar, where curlers can add one to the cart and complete checkout. This post explains the rental options being added and how they fit into the calendar.

Managed Waiver Templates for Membership Associations

· 6 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

This post is part of our Curling IO v3 sneak peek series, where we explore some of the new features available in the upcoming version.

Membership associations sometimes need more than a recommended waiver. A group insurance policy may require every member club to present the same approved language to its Participants.

Emailing a Word document to each club distributes the wording, but it does not keep that wording under control. A club can edit its copy, miss the next update, or keep collecting responses against an old version. Later, the association may have no reliable way to tell which document a Participant actually saw.

Curling IO v3 will connect those pieces. A membership association can publish one locked waiver, make it available to its member clubs, update it in one place, and report on which clubs have Participants responding to it.

Your Club, Your Product Types

· 4 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

This post is part of our Curling IO v3 sneak peek series, where we explore some of the new features available in the upcoming version.

Curling clubs sell much more than leagues and bonspiels. They run clinics, rent ice, assign lockers, host junior camps, sell banquet tables, and collect donations.

Today, each of those offerings has to fit one of Curling IO's predefined types. That works, but sometimes only because a club picks the closest available bucket. One active junior summer camp is stored as a Product, with its August dates written into the name. A full-sheet ice rental is stored as a Program because it needs a date, capacity, and a waitlist. A donation is stored as a Fee.

In Curling IO v3, the organization decides which product types it needs. A club can create Camps, Clinics, Ice Rentals, Locker Rentals, Fundraising, or any other category that fits its operation, then choose what each type can do.

Automate Club Management With AI

· 5 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

Imagine you're a club manager setting up next season. You open your AI agent and type (or just say):

Set up early bird pricing for the Tuesday Night League. 15% off if they register before September 1st.

Five seconds later, it's done. No browser tabs, no forms, no clicking through menus. With Curling IO v3, this is something you'll be able to do.

Custom Registration Forms Are Coming to Curling IO

· 3 min read
Dave Rapin
Dave Rapin
Founder @ Curling IO

This post is part of our Curling IO v3 sneak peek series, where we explore some of the new features available in the upcoming version.

Registration forms in Curling IO have always collected the basics: team name, lineup, skill level, contact info. But every club runs things a little differently. Some need emergency contacts. Others want dietary restrictions for banquet planning. A bonspiel might ask for team contact information while a league doesn't.

In v2, admins can already choose which questions appear and create custom ones. What's new in v3 is control over the layout: where each question sits, how wide it is, and how the form is organized into sections.