A demo app built with Elements.
Rooms joined by link with a name, face-down votes, a reveal with the average and spread, and a CSV of estimated stories.
Demo: Sizingdeck
- Agent: Claude Code, Opus 5.5 Medium
- Time: 18 min
- Cost: $5.08 at API rates, September 2026
elements create sizingdeck -scaffold=elementscode/demo-sizingdeckSizingdeck needed rooms anyone can join from a link, cards that stay face down until the reveal, a table everyone sees change as people vote and a CSV of the results. Each of those is a part of Elements, so the agent spent its 18 minutes on the game itself.
-
A live table. Rooms, participants, stories and votes are LiveTables, one view per room. When someone joins, votes or the facilitator moves to the next story, every open copy of the room updates.
-
Face-down cards. A card reaches the browser only after the reveal, so everyone sees who has voted while the cards stay face down. The reveal shows the average and the spread.
-
Join with a name. A teammate opens the link, types a name and is signed in with a session, in the room a moment later.
-
Facilitator controls as function calls. Adding stories, voting, revoting and saving an estimate call server functions straight from the page with
@rpc. Each call checks the caller's seat, and another participant can take over as facilitator. -
Estimates as a download. The room exports each estimated story with its estimate, average and vote count as a CSV that opens cleanly in a spreadsheet.
-
Data from SQL files. Migrations define the rooms and seed a demo room with five people and seven stories, four already estimated.
The project server runs alongside the agent and answers as soon as a file is saved: it type-checks the templates, TypeScript and SQL, applies migrations and reruns the tests, so every question came back right away and the agent kept building.
The app type-checks with zero errors and all 19 tests pass. Every page works on desktop and phone.
There are no accounts: you join a room by typing a name. The development seed
creates one room, Checkout Squad · Sprint 42 at /r/sprint42, linked from
the home page. It has five people at the table (Priya Raman, Marcus Chen,
Sofia Alvarez, Dev Okafor and Hana Kim), four stories already estimated, one
story mid-vote with all five cards face down, and two stories queued.
Join with any name and your seat is the one still to vote. Click Take over to become the facilitator, then reveal the cards, settle the estimate and export the estimated stories as CSV.
Demo: Sizingdeck
MIT. See LICENSE.