What it does
A JEV_MOCK flag swaps the API for a random picker so the interface can be styled without spending tokens — the mock returns confidence 1, which the UI politely displays like any other verdict.
Playable demos & bots
Chess Jev Web
A Next.js chess app whose API route forwards each position to the System One endpoint as one typed choice question per move.
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How you can use it
Sketch your chess board design first. Next, ask a programmer to connect the game to the helper service. On each turn, your program sends the current board layout as one question with choices for the next move.
While designing how the pieces look, your programmer can switch on a practice mode. This mode picks random chess moves automatically. That lets you adjust the visual style without paying for online queries.