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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsFinePrint is a web agent that takes an eligibility question about a hackathon entry, pulls the matching rule text from structured event records, and checks the facts you give it against those rules with a typed checker rather than leaving the verdict to a language model. The Sanity Challenge entry period closed on October 4, 2026 at 11:59 PM PDT, so the project is now most useful as a worked example of how to test an entry against rules that can change, and as a reference for what a tool like this can and cannot tell you.
What FinePrint does
You ask a question in plain language, such as whether your app can enter a particular path or how many entries you may submit. FinePrint answers it in terms of the specific conditions that apply, and it shows the rule text, the accepted facts, and the condition behind each result. The project is described in a first-person DEV Community submission by Himanshu Kumar, published September 24, 2026 and edited September 29, 2026. The details below are the author’s account of the system; they have not been independently reproduced.
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Every answer resolves to one of five states:
| Result state | What it means for you |
|---|---|
| Supported | The facts you supplied meet a retrieved, dated requirement. |
| Blocked | A retrieved requirement is not met by the facts supplied, and the quoted source is shown. |
| Missing fact | The check needs a fact you have not yet given, so no verdict is reached. |
| Rules unclear | The source text does not settle the question, or two sources disagree. |
| Not applicable | The requirement does not apply to the facts in the question. |
The central design choice is the separation between interpretation and evaluation. The model proposes facts from your wording and explains the source material. Typed conditions then evaluate those facts against structured requirements. Where the two disagree or the evidence is thin, the interface is meant to surface that disagreement instead of smoothing it into a single confident answer.
How a question moves through the system
According to the author, a single question passes through these stages:
- The agent retrieves an outline of the Knowledge Base for the event.
- It selects the relevant paths and reads them in full.
- It submits your facts, each with the quoted words from your wording that support it, together with its own interpretation of the rules, to a typed requirement check.
- It validates those proposals. Citation paths that were never actually read are removed, and the removal is disclosed in the answer.
- It runs the typed conditions against the validated facts.
- It writes the answer, citing only the retrieved entries. If no valid citations remain, the answer is rejected rather than shown.
The rejection step matters for anyone deciding whether to trust an output. A response that cannot point to retrieved text does not reach you.
How the rules are stored and read
The curated rules live in Sanity as three kinds of record: events, requirements, and source versions. Each requirement belongs to an event and to a dated source version, so every result can be traced back to a specific snapshot of the rule text. FinePrint reads the current curated records through a Sanity Context MCP endpoint backed by a Knowledge Base. The author names Next.js, TypeScript, Zod, Sanity Content Lake, and Context MCP as the stack, and says a server-side Context Viewer token keeps the credential away from the browser. Personal reviews are stored in the browser, with autosave, export, and a facts-only backup option. These security and storage claims come from the author and have not been audited.
Curated packs and imported rules
Curated event packs
Two curated packs are described: Sanity Challenge, with 19 requirements, and GIBC V2 Open Invention, with 18 requirements. These counts are the author’s figures for the packs as published.
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Importing a public rules page
FinePrint can also import any public rules page. The model proposes requirements from the page, but a requirement is kept only if it quotes the page word for word. Requirements that do not map safely onto the fixed fact vocabulary, or that lack a supportable numeric bound or a timezone-aware date, are not allowed to produce a Supported result. They appear as “Check yourself” instead. Imported events remain in your browser and are labeled unreviewed, which means no one has checked the extracted requirements against the organizer’s text beyond the automated quoting rule.
In practice, this makes imports cautious by design. A vague deadline phrased as “end of the week” is a poor candidate for a Supported result, and the tool is built to say so.
When the rules change during a contest
The clearest example in the project concerns a submission limit in the Sanity Challenge. The sequence below follows the author’s account and the official contest text.
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| Date (2026) | What the source said | What FinePrint returned, per the author |
|---|---|---|
| September 20 | An FAQ said one submission per path, while the contest-rules text reportedly allowed unlimited entries. | A two-entry question was marked Rules unclear, and the user was asked to seek organizer clarification. |
| September 24 | The official contest text said: “Only one submission per path is allowed.” | Rule pack 2026-09-24.1 was published. The saved two-entry review then showed Blocked, with dated quotes retained. |
Two mechanics make this useful for entrants. First, saved reports keep the requirements and sources used at the time of the check, so an old answer can be reconstructed. Second, when a curated pack changes, FinePrint compares added, removed, or changed requirements and follows source references to findings that may be affected. The project checks curated Sanity records only. It does not monitor organizer websites, so a change posted on an organizer page reaches the tool only when someone updates the curated record.
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DEV’s official Sanity Challenge page describes Path One as “Ship an Agent That Queries Real Content,” requiring an agent pointed at a Sanity Context MCP endpoint backed by a Knowledge Base. The listed Path One judging criteria are:
- Meaningful use of Sanity Context and structured content
- Technical implementation and code quality
- Knowledge Base use
- Usability
The official contest rules, published on DEV’s contest-rules page, set the entry period as September 18, 2026 at 9:00 AM PDT through October 4, 2026 at 11:59 PM PDT. They require a DEV submission post and either a Sanity project ID or a public dataset URL, and they state: “Only one submission per path is allowed. This is to encourage quality over quantity.” The challenge page lists winners to be announced October 22, 2026. The rules list three Path One winners, each receiving $500 USD, DEV++ membership, and an exclusive DEV badge. These are contest terms, not revenue from FinePrint.
What the reported testing shows
The author reports several checks. Each should be read with its limits attached:
- An automated engine matched 42 authored regression scenarios. These are scenarios the author wrote, not an independent test set.
- An earlier model baseline agreed with 39 of those 42 labels. The comparison is against the author’s own labels, so it measures agreement with the author, not general accuracy or retrieval quality.
- A September 29, 2026 release passed 345 automated tests and production-build checks. A later snapshot reports 152 tests. The two counts are separate snapshots and should not be added together or treated as independent validation.
- Several live agent runs were recorded with response times. The author does not present these as a benchmark.
The author states that the tests cover specific boundaries and questions and “do not establish general eligibility accuracy.” That is the right reading. The evidence shows the checker behaves as designed on the cases the author chose. It does not show that FinePrint will correctly decide eligibility for an arbitrary competition.
How to use this approach on your own entry
The project’s own examples show the questions a careful entrant should be asking. One reads: “I started my app in August. I added Sanity this week. Can I enter Path One?” Another reads: “I am planning two entries in Path One.” A third, future-facing example asks whether an existing app can be extended for a competition and which tracks it could qualify for. Each of these depends on dates, reuse rules, and entry counts, which is exactly where the wording of a rule matters most.
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Whatever tool you use, the following habits follow from how FinePrint is built:
- Record each fact with the date you established it, such as when the app was started, when Sanity was added, and how many entries you have made.
- Keep the exact rule sentence that governs the question, and note its date and whether it comes from an FAQ or a formal rules text.
- Treat a conflict between an FAQ and the rules as unresolved until the organizer confirms it in writing.
- Re-check your answer after any rule update, because an earlier verdict may no longer hold.
Limits to check before relying on it
- The project is an author-described submission. It has not been independently audited, and its source repository, Sanity dataset, and security posture have not been reviewed by a third party.
- The author reports a limit of five live answers per ten minutes. This is an implementation detail that may change, so confirm it in the live app.
- Only curated Sanity records are monitored. Organizer changes reach the tool only after the curated record is updated.
- Imported rules are labeled unreviewed and may produce “Check yourself” rather than a verdict.
- App availability and curated rule content can change after this article was written. Verify both before making any current claim.
For the Sanity Challenge specifically, the question is now historical: entries closed October 4, 2026, and winners are due October 22, 2026.
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