# Small Limits Enjoyers - **Event:** [Meta Global AI Developer Hackathon](https://cerebralvalley.ai/e/meta-ai-developer-hackathon) - **When:** Oct 26, 12:00 PM – Nov 4, 9:00 PM (EST) - **Where:** Online - **Team:** [Igor Subbotin](https://cerebralvalley.ai/u/kashtan), [Vladislav Kim](https://cerebralvalley.ai/u/vladeke), [Sergey Malakhov](https://cerebralvalley.ai/u/steppetech), [Amirlan Abdrakhmanov](https://cerebralvalley.ai/u/Amrskk) - **GitHub:** https://github.com/steppetech1/Quack - **Demo video:** https://www.youtube.com/watch?v=Yn9dSDGKcak - **Gallery:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery - **Page:** https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4563 Quack is an effective learning tool: it maps a student’s knowledge boundary for every skill—what is proven, failed, or still unknown—and maximizes real understanding per hour spent rather than following a fixed course syllabus. Studying is usually poorly organized: materials and walkthroughs vanish across hundreds of AI chats, mistakes go untracked, review is random or absent, and practice waits until the last minute. Standard AI chat only makes this worse: it explains smoothly and solves problems for you—feeling like "I get it" while reading, until the exam proves otherwise; meanwhile, it forgets what you confused last week and never revisits errors. Organizing this yourself takes discipline almost no one has. Quack does it for you—without extra discipline or time, just more real understanding in the same hour. The user journey is simple: open it, attach a lecture, and learn in your professor’s notation with slide links. The system guides you across 6 mastery levels, tracks misconceptions with exact quotes, and transfers skills across subjects. Built into the chat are trap questions from your errors, "why this choice?" prompts, an "unclear" highlight button, and interactive slider demos. Inside is a two-layer canvas: solve by stylus, keyboard, or on paper via a QR-paired phone that turns photos into live lines and clean diagrams. It tracks step order, voice, and crossed-out attempts, pauses for self-correction, and drops a quiet mark or hint right where you stall. Everything auto-organizes into a subject graph: topics hold living notes with a "your traps" block, "cue → method" cards, and session links; canvases are searchable by formula meaning; and deadline hubs bundle mock exams with a cheat sheet. Debt-free FSRS review weaves into lessons, verdicts are disputable via "disagree," with custom `/skills` and Obsidian/Anki export. Behind this stands strong engineering: a false diagnosis is worse than a missed mistake. Models (Muse Wonder and Spark on Meta Responses API) only propose observations, while deterministic code computes mastery and guardrails ("honest verdict," no skipping prerequisites, "ask when uncertain"): formulas are verified via SymPy and pint, and model verdicts require a pair of distinct tasks. The source of truth is an immutable Postgres event log: a projector builds the Neo4j graph from it, reducing any dispute, rule change, or deletion to one replay without LLM calls. The LangGraph teacher turn in the API never waits for background work: it overlays the session onto an in-memory graph slice and streams the reply (`head → body → markup`), checking prerequisites before the first word and holding a spoiler buffer. In parallel, a custom Postgres queue with job coalescing and Redis rate limits drives background agents: SAM 3.1 and OpenCV parse paper photos, the analyst updates the boundary, second opinion audits uncertain marks, and the viz agent renders and self-checks demos in headless Chromium. ## More from Meta Global AI Developer Hackathon - [Sh4cry](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4560) - [Team Cosmas](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4561) - [Chiifa](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4562) - [Ampersand Prep](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4564) - [Onco-Muse](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4565) - [Ghost Hands](https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4566) --- Markdown version of https://cerebralvalley.ai/e/meta-ai-developer-hackathon/hackathon/gallery/4563. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt