Every day, a new case from the kingdom of Larkspire: forty sealed documents and five suspects. Ask a question and the archivist pulls the three documents that answer it best. Read, pin your proof, and name the culprit before your questions run out.
Coming soon · for puzzle players, and developers curious how an agent picks its context
One email when it launches. Nothing else, and never shared.
It’s Contextrie, an open-source library for choosing an agent’s context. When the case was made, it read every document and wrote a title, a summary and key points. When you ask, it scores all forty against your question and pulls the top three. Each pulled document shows its score and the reason it was picked.
You can. The archivist only pulls documents; nothing writes you an answer, so nobody can tell you who did it. Whether the three it pulls help is up to how you ask.
Yes. The first time anyone asks a question, its pull is saved, and everyone asking the same thing gets the same three documents.
Each case is played once by Contextrie with the same eight plain questions. You see how many it needed at the end. Try to beat it.
Today’s case, every day. A one-time $0.99 opens the archive of every past case, forever. No subscription.
Your questions are saved against your case so you can come back to it, and their pulls are shared with other players. We record anonymous counts only.
Yes. It runs on Contextrie (open-source context and state) and Bref UI (open-source interface). Both are on GitHub.
Open source underneath
CaseFile is a thin layer on open-source packages. Star them, fork them, build your own micro.
Open-source context and state for AI: it keeps only what matters for the question.
In CaseFile: The archivist. It indexed every document once, and for each question it judges all forty and pulls the three that matter, with a score and a reason.
Open-source Svelte components for clean, accessible interfaces.
In CaseFile: Every window, button, choice and dialog, in a skin of their own.
Also built with SvelteKit · Vercel AI SDK · Zod