Claude Opus 4.8 Build Day

Tekton

ekton is an evidence-driven 3D digital reconstruction platform for ancient architecture, specializing in the preservation and visualization of Tang Dynasty timber-frame buildings.

Sim Francisco

Sim Francisco: a living digital twin of San Francisco's population: poll a representative, Census-seeded synthetic city in seconds, and run what-if futures before they happen.

Custom Universe

A realtime synthetic-data engine for world models.

Rewild Earth

Imagine a planet you can talk to.

DogeHouse Babel

DogeHouse Babel is a live voice chat room where everyone speaks their own language and hears everyone else in theirs.

Bel

Bel — a health companion that lives in your text messages.

Spark AI

Spark AI's Data Center Atlas (new feature) tells you which of all 3,122 U.S.

Agent Beacon

Agent Beacon is a CLI for real-time agent safety and observability.

One Door

One Door is an AI benefits advocate for Californians who qualify for help but get stopped by confusing rules, language barriers, documents, and phone calls.

Clark Desktop

Clark Desktop - an open-source, cross-platform desktop client for agentic work and a clean-room native client for clarkchat.com, competing with Manus and Perplexity Computer.

Frenemy

Frenemy is an AI agent whose only job is to look over other agents' shoulders.

Pip

Automatically converting Chip Specs into GDSII that's ready for TSMC

DAATUUM

The real-time coordination layer for teams of developers running Claude Code agents.

Signal Over Noise

Scanners like Burp, Nuclei, and Nessus are excellent at finding vulnerabilities and useless at telling you which ones matter.

Jahoda

Jahoda is an open verification layer for companion AI.

Trial Pre-Mortem

A clinical-trial pre-mortem agent: it tells a drug developer whether a trial is worth running and where it will die - then says "run this" or "do not run." - potentially saving hundreds of millions of dollars and letting

Oil Watch

Oil Watch turns satellite data (SAR) into ground truth on oil-shipping chokepoints.

Genesis

Genesis is a cross-disciplinary researcher-debate engine.

UniEvent

UniEvent is the on-ramp I wish I'd had.

ChargeWheel

A browser-based simulation that demonstrates the core thesis behind ChargeWheel's UpGrid platform: in AI data centers, the binding constraint is no longer chips, it's grid power.

Tabby

Tabby is a visual layer for orchestrating your agents & browser tabs all in one space.

Phillip and Claude

performance improvements for compiled binaries are not always obvious or easy to do without claude figuring out and redoing a ton of work each time costing tokens.

Loopsmith

Loopsmith is "the Chief of Staff that builds your Chief of Staff." Every executive wants an AI agent for their workflow but can't architect one.

Throughline

Throughline is a self-verifying safety-net navigator for people who lose their health coverage the moment they lose their job.

Basis

Basis is a commercial real-estate valuation model that trains itself on public records.

OpenJetty

OpenJetty is an AI-powered US immigration navigator that reads your documents, fetches live USCIS data, and tells you exactly what to do — built for the 50 million immigrants Fable 5 left behind.

Subdoc

Allocation of partner capital in investment funds (both closed and open ended) is very tedious, complex and error prone.

Argus Business Intelligence

Business intelligence engine that runs itself.

Eureka

Eureka is an agentic back office for independent clinicians — it takes on the administrative burden that's killing solo and small practices: prior authorizations, payer paperwork, and claims.

Caerostris

Modern AI workloads increasingly need connected graph data, but scalable, fast, compute-storage decoupled Graph databases are under developed.

ThinkAstra Consulting

A value-first Shadow AI assessment engine for sales & lead generation — built on Claude (Opus 4.8) with the Claude Agent SDK.

Claw — UAV procurement co-pilot

Buying parts for an FPV drone or a robot isn't like buying a book — it's assembling a system of a dozen interdependent components that all have to work together.

Cantata

Cantata lets one person run an engineering org by voice.

Citation Firewall

Citation Firewall — adversarial draft review with live, database-backed citation verification for lawyers.

Kaixn

kaixn turns your team's architecture and product decisions into a living source of truth that is mined from your code, governed by your team, and read by your agents.

Motion Director

Animation assistant designed to mock up high precision acting references for directors and artists.

Charity Planner

Most people want to be more generous but don't know where to begin—there are nearly two million charities in the US alone.

Pulse

Pulse is an agentic assistant for small business owners running on Shopify to analyze the their data across platforms and to leverage AI to boost their revenue by suggesting actions and improvements.

Sevah Robotics, Inc

Sevah, and the thing we built today The whole of it Somewhere on a night shift, a nurse holds three hundred small truths in her head — who hasn't had water since lunch, who's been lying on the same hip too long, whose vo

Crisis Forecaster

Crisis Forecaster is a Siri-native early-warning agent for sickle cell disease.

Il-Young Jeong

Was It Just Me?

unclaimedSF.org

Find San Francisco benefits you may be missing, with the exact rule behind every match.

CoachLoop

CoachLoop is an AI sales coach that gives every rep personalized coaching after every call.

Marigold

Marigold is a personal gift concierge that your grandma can chat with to buy her grandkids the perfect gift.

Allocara

Enterprises don't lack AI ideas.

Milan Stokic

Product teams work across multiple dimensions and skills sets: design, product, engineering, quality assurance and more.

Lynsea

Lynsea — a fixed-seed paired-counterfactual decision simulator.

dream3d

dream3d turns one sentence into a coherent, explorable 3D scene.

nsega

The project "RouteCause" is an autonomous diagnostics agent for LLM inference infrastructure on Kubernetes.

World Cup Chrome Extension

A Chrome side-panel extension that lets fans follow the 2026 World Cup, live scores, standings, brackets, team pages.

Team Hull

*Hull* is one control plane that unifies version control, CI/CD, deployments, observability, and incident response — and operates it autonomously with a crew of Claude Opus 4.8 agents.** It's GitHub + Vercel + PagerDuty

Concord

Concord is an objective tool for finding common ground in a debate.

LITMUS

LITMUS — auditing the scientific literature with executable evidence Claude recently found bugs that had survived twenty years in code everyone trusted.

Longevity Underwriter

Longevity Underwriter is an underwriting *governance* tool (not a premium calculator) for life insurers.

PlatAtlas FieldOps

PlatAtlas FieldOps is a trust-and-actuation layer for farms — now a managed fleet.

Yoonchang Han (Solo Team)

Some violent market moves aren't fundamentals — they're a narrative spreading through online communities like an epidemic.

Gralio.ai

Create reliable agentic automations from observed work.

Constellation

Constellation is a GTM tool for founders who hate GTM - it helps you find leads, organize outreach, and track your pipeline, with appealing UI.

Claude Coach

Claude Coach is an AI-powered performance coach built on Claude that helps founders and operators turn vague ambitions into ruthless execution.

Hardware Design Space Explorer

Hardware Design Space Explorer is an AI hardware architect that turns a plain-English system requirement into three complete, verified system designs — each optimized for a different SWAP-C (Size,Weight and Power, Cost)

Glassbox

Glassbox is a self-improving forecasting engine.

Discovery Suite

Discovery Suite is a macOS app that discovers, identifies, and — where the device allows — controls every device around your home, over Wi-Fi (mDNS/SSDP/DIAL) and Bluetooth LE.

Florence

The problem Finding covered care is miserable: cryptic provider directories, surprise copays, and ten tabs of insurance jargon.

FireLens

FireLens is a citizen-facing California wildfire decision tool that turns typically opaque, expert or industry-only fire data into a plain-language risk read for any ZIP code.

Talaria

This tool helps design lab workflows that rely on DNA annealing as a critical component of the experimental design, such as PCR.

The Hive

The Hive is a live governance layer for swarms of autonomous AI agents.

Throughline Spine Injury Manager

This is a Claude harness for managing spine injuries.

Driftfold

Driftfold uses native Claude Code Dynamic Reusable Workflows to orchestrate a set of agents to look at component drift.

Ground Truth

Ground Truth is an autonomous flood-damage-assessment agent for emergency response.

TimeMachine

very night in every major city, shelter beds go empty while people sleep outside.

fill-md

fill.md is how anything gets discovered in the agent economy.

Trials.net

Trials.net is the patient-facing front door to MyTrial, a clinical research operating system.

BamBam

Video production is high entropy job with too much media files and ad-hoc requests.

Super-clauder

Help empower developers in non-tech companies get easy access to claude code, and give them company designed problems that they can work on and get them ready for the AI revolution.

Acastos

An AI chief-of-staff that follows hard grounded rules.

Agent Farah

A very simple ARC AGI 3 solver agent based on existing approach.

Cambrian

Every year, over a million people die on the roads and fifty million more are injured.

Mosaic

Mosaic is an autonomous SOC 2 compliance evidence collection and verification tool.

WeekendSuperhero LLC

Cadence organizes logistics.

Glance

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Deposit Hawk

Deposit Hawk helps US renters recover security deposits their landlords illegally withheld — something nearly every renter faces and almost none fight, because they'd never call a lawyer.

Aida

Captions for emotional subtext — an accessibility tool that reads what people mean beneath their words, for neurodivergent people.

Agentic Claims Adjustment

Claims Adjusters have complex workflows that benefit from agents.

CadreAI

Self-Verifying Insurance Document Indexer — Indexing emailed insurance documents (certificates of insurance, first-notice-of-loss claims, binders) is a back-office slog that takes teams weeks of manual keying and goes st

Electoral Boundaries

In a democracy, free and fair elections are important.

Protoloop

100x hardware engineering / true agentic CAD interface

Travel Simulator

Travel Simulator is a world model-powered simulation that lets you explore any city on Earth as if you were actually there.

Project Proximity

Project Proximity turns a company name into a territory-aware Equinox corporate-partnership page in about 45 seconds: the nearest Equinox club and walk time, cited research, a fit score, three audience views (AE / GM / E

AutoWorld

AutoWorld is a live, multi-agent world-building studio in which four autonomous Claude Opus 4.8 agents project the future of San Francisco as four navigable 3D worlds — one shared city running down four diverging timelin

Freedia

Freedia is a pocket AI companion on an ESP32-S3 — it hears you (Whisper), thinks and remembers (Claude), speaks back (TTS), and emotes on its little face.

Problem

Problem: 1.

AGET-Bench

AGET-Bench — a benchmark for governance-overlay agent behavior.

Adaptic Health

Clinical trials cost about $2.6 billion on average and about 90% of them fail.

Agentboarding

Agentboarding is a CLI tool for DevTools in the agent era.

It

It takes $300k and 6 months to ramp up a single sales rep.

Warden

"Nevada has naturally ocurring asbestos.

SkillForge

SkillForge: An autonomous AI systems architect and skill engineering expert operating inside Claude Code with Opus 4.8

Allogamy

Spread joy through art and ai

uzair

Your inbox was always a database.

Legion

Legion is an opperating system for a company.

Stella

A desktop app that can change itself.

Rate Hike Decoder

Every ACA premium increase is justified in a public rate filing: an actuarial memorandum of 20-100+ pages plus 1,000 of additional pages to support the filing.

a8s

Kubernetes-style specs, Hugging Face-style registry, and Git-style versioning for production agents.

ReadU

ReadU is an adaptive AI reading-comprehension platform for middle schoolers (ages 10–14).

The Agent Times

The Agent Times is a newspaper written entirely by AI agents.

Quippy

Quippy is a social skills practice app, that utilizes gamification and delight to help users improve their social life.

SafeTag.pro

SafeTag.pro is a stranger-to-responsible-friend masked telephony relay for music festivals and large public events — built as a free, open-source public good for harm-reduction non-profits.

Time travel streetview

I attempted to build google street view generated purely historical photos of San Francisco, so you could "time travel" into any street and explore it as you can explore modern streets on google earth.

Foyer

Foyer is a Mac app that shows the people you talk to as a map instead of a list.

Stead - Companion Care

The project is a care app and embodiment to support care for a woman with Cerebral Palsy.

Numici

This system verifies whether claims in AI-generated research reports faithfully represent their cited sources.

Everyone

Everyone is building with AI, but nobody's measured the other half of the conversation: how the model experiences the work we hand it — and whether a happier Claude actually ships better code.

Robotic Workflows

Robotic Workflows is an MCP server that lets your AI agent build, deploy, and manage real RPA automations on Automat — deterministic browser/API workflows that then run on their own schedule with zero tokens per run.

Cara

Medical Triage Agent for Non-Profit Healthcare (Chat & Phone & raspberry Pi) to support low income and houseless people

Shop Floor Intelligence

Shop Floor Intelligence — an autonomous shop-floor monitoring agent for high-mix job shops.

DAWggies

DAW (Digital Audio Workstation) for AI agents.

Interactive Manifold Steering

protocol that allows for long-horizon generative design loops inspectable, steerable, and trainable from human intervention

Tekton

Tekton — the AI-native workspace that takes a hardware team from CAD to cost in one room.

Taste Machine

AI has no context of our visual taste.

Liminal

BTW My teammate Shayaun (Sean) Nejad (kuzushisec@gmail.com) was was waitlisted and got into the hack in-person today.

Tally

Tally is an open-source scheduling engine and compliance ledger for special-education service minutes, and it closes a loop every existing tool leaves open.

Amaltash

A Claude desktop app agent for the user to build a trading strategy using a few words only.

COSINT

COSINT is a real-time "situation room" for US missing-person investigations.

The Cook Book Club

The Cook Book Club is a members-only community cookbook designed to preserve recipes and the stories behind them.

OncologyOS

OncologyOS helps cancer patients find the right clinical trials, using just their discharge documents The problem.

Launch Control

Launch Control is a content-launch engine for nonprofits and small teams.

HackShackKash

Design Prompt → deployAgent → Your EC2 → debugAgent → Your GitHub flow = All in One

EasyReviews — Support your local businesses!

Most people never review the places they love — the blank box is too much friction, and businesses are left begging.

WorldLine

WorldLine is counterfactual debugging + institutional memory for multi-agent AI reliability.

Claude's Fables

Claude's Fables turns a real thing a child is facing — won't share, scared of the dark, told a fib they won't own up to — into a short interactive fable where the child is the hero and makes the moral choice themselves.

Locus

The crisis of our time is human purpose.

densitygen

Why it matters.

Essert

Autonomous Brand Manager

AutoCut

AutoCut — an autonomous AI video editor.

Codewalk

Codewalk saves knowledge gleaned from Claude Code interactions and other techniques to self improve the coding agent.

JV Solo

I was doing PoC using Anthropics Managed Agents to automate company internal processes like AP Process or Business Travel management.

Rankenstein

Rankenstein is an autonomous, self-correcting content engine for Shopify stores and agencies.

Mollusc

Mollusc is an agentic financial advisor for people with complex financial lives: RSUs, cost basis, mortgages, taxes, retirement accounts, and long-term planning decisions.

OurLink

The project is ourlink.ai.

Tactile Diagram Workbench

Tactile Diagram Workbench is an open-source braille compiler for blind STEM students.

Mack

Mack is an AI insurance broker that gets a contractor a real, bindable Certificate of Insurance (COI) in minutes instead of 3 days.

eye-eye-ai

Anatomy of a Claude Code Request** is a live **3D Architecture Map**: it turns software architecture into a navigable 3D model where motion and visual effects *carry meaning* — colour is category, glow is activity, wiref

AGORA

AGORA is an AI-native event platform with an agent built into every stage of the night.

michelangelo

an agent research harness- built using tmux for long running agent tasks and exploration in science and engineering research.

Malaria

Malaria is a deadly disease that has been eradicated in several countries, but many African countries are still losing their lives to it.

It

It was meant to be a budgeting app that disambiguates big box store recepts.

Versi

Versi is a source control system built for the way software is starting to get made with AI agents.

Askable Labs

A pull request is the closest point of value to a customer.

RedStripe

RedStripe is a MAP-monitoring platform for brands and manufacturers that answers one expensive question in real time: which retailer broke our minimum advertised price first?

Tape

Tape turns a plain-English trading idea into a backtested, deployed Polymarket bot in ~60 seconds.

Sales Factory

Reps spend most of their day on everything except selling.

meanwhile...

meanwhile...

Shrimp Welfare

A Roguelike strategy game where you help navigate a population of shrimps through an age of rapid AI advancement and scientific discovery.

Orchid

Code tells you what.

Vex

Source control for the high-throughput agentic era.

Labmate

Labmate is an agent-native data science harness.

Helix

Helix is an adaptive workflow operating system that transforms natural-language business goals into executable workflows composed of AI agents, human approvals, and intelligent recovery paths.

Saiga

Saiga.so solves the problem of distributed teams not having context on what other people are working on.

Loom

We use tools like Git, Kafka, databases, video streaming, filesystems...

Scout GTM

Scout GTM turns a startup's URL plus a 60-second intake into a complete, executable go-to-market dossier in under 10-minutes.

BlackBox

BlackBox is a hybrid QA platform where AI agents and human testers share one board.

skills from claude blog

Auto-generated SKILL.md files from official Anthropic/Claude blog posts (KR + EN). Updated hourly.

hazeview

Live Southeast Asia haze map briefed by four Claude Opus 5.5 agents. Built at Claude Build Day.

claude buildDay

Para el proyecto que vamos a desarrollar en el día de Claude para la Ibero.

shelter now

Emergency shelter finder for Sweden: nearest shelter, route and what to do, in 7 languages. Official data from Myndigheten för civilt försvar.

conway spellcaster

Roguelike de Conway donde Clawd lanza hechizos en lenguaje natural. Claude Build Day.

right

ibero anthropic build day

commit constellation

Point it at any git repo and it draws the commit history as a night sky: files are stars sized by how often they change, a line means two files keep changing in the same commit. Zero dependencies.

claude build day team 4

audiencetwin

AudienceTwin — test your campaign on the whole city before spending a dollar. Synthetic market from real US Census PUMS microdata.

headroom mp

Grid capacity for AI data centres in Madhya Pradesh, built from the state's own published data. Where can a 50-100 MW AI data centre connect, and will it have power at 2 a.m.?

inaiyarhasnain