I made a Minecraft mod for Claude Code and it's free

You press K in game and tell it what you want like a medieval castle with a moat and Claude builds it in your world while you keep playing. Don't like it and one click undoes everything

I built it myself and used Claude Code a lot along the way for the code the tests and the debugging. I decided what to build and tested it in the game

Under the hood the mod launches your own Claude Code on your PC and it builds by calling 20 tools that run inside Minecraft. Nothing goes through a server of mine

To try it you need a Claude Pro or Max sub with Claude Code installed plus Minecraft Java 26.3 and Java 25. The mod itself is free with no account. Grab the jar at https://www.craftai.world/ and drop it in your mods folder (works with Fabric or Forge or NeoForge) and the guide there has the steps

It's a beta. Biggest build I timed was a 34k block castle in around 15 minutes

Would love to know what you'd ask it to build !

My wife and I share the same Claude account. Lately, I noticed she’d been asking Claude a LOT of questions about our relationship issues.

So, I set up custom instructions for our account, and now things are more than sorted. 😂

Thanks, Claude, for this feature!

"We'll upgrade them as the rollout expands to Chat and Cowork"

DON'T!!!!! I use project folders all the time, this will literally ruin my entire experience, make it opt in, do ANYTHING besides making projects "one conversation"

I don't want the conversations inside a project to communicate, that defeats literally the entire purpose of how I use projects, oh my God Anthropic please do NOT bring this to chat, or make it a separate feature. I use project folders for hours a day

I'll genuinely cancel, I am a Max user, project FOLDERS are integral to my process. MAKE IT OPT IN!!!! Or again make it a separate feature you can choose! I literally do not want this

It’s called spelunkr.

24 channels (so far) of forgotten videos organized into themed "cable tv channels" that play on a synced schedule 'round the clock.

The entire collection so far is about 2,700 hours of video, running around the clock. You tune in and land in the middle of whatever is on, at the same moment as everyone else watching, the way TV used to work.

Codebase is about 87,000 lines, made up of 24,000 of app code, 13,000 of CSS, 28,000 of tooling scripts, 16,000 of tests and 5,000 of SQL. 670 commits over 8 months, and we run over 850 unit tests and 160 browser tests. It's been a real passion project for me, really my first idea of what to build with Claude and has just been growing slowly as I've had time to work on it.

I've been plugging away at this off and on for the past 8 months, about 30 days of "total" work across that time, nearly all of it done with Claude Code. Here's how it works under the hood:

All videos on the website are streamed directly from the Internet Archive. The player is a plain HTML <video> element pointed at the Archive’s own file. No iframe, no proxy, no re-encoding, no copy. Spelunkr itself serves the page (about 110 KB of JavaScript, gzipped), small JSON schedules, and about 200 public domain or CC BY or BY-SA music tracks for the breaks. Every title links to the tape’s own page at the Archive.

There are station "bump" breaks between videos as an homage to the classic Adult Swim bumps.

Channels are built from Archive search audits to see if the IA has enough content to support a full length channel. Some channels are classed as "REWIND" and usually are 2 to 6 hour long VHS rips of actual live cable TV from someone's VCR in 1993. There's also classic movie channels dedicated to horror, monster flicks, detective noir capers, and western flicks. I even found every episode of The Joy of Painting and gave it CH 12: HAPPY TREES.

Claude checks all the tapes to make sure they're legit, then formulates the descriptions, facts, and schedule for me to approve. Each channel has its own branding, a 32×32 pixel logo drawn from eight color tokens, its own station-break voice and its own music pool.

A channel orders its tapes one of three ways: by year (8 channels), shuffled (12), or block rotation (4). Block rotation is a few episodes of one show, then the next show, round and round.

A channel is a published list of tapes with a start time.

“What is on now” is arithmetic: walk the schedule from its start to the present. The same code runs in the browser, the publishing tool and the tests, in whole milliseconds, so every machine gets the identical spot on every channel's schedule across the globe.

The math also accounts for the bump breaks, which get re-picked on every pass through the lineup. The browser measures its clock against the server’s once (the HTTP Date header) and corrects it only when it is more than 2 seconds off. A new lineup is published at least two minutes ahead and takes over at the end of a break. Open tabs hear of it over a websocket and switch without a reload.

Some key features built in:

• Limited DVR: Pause, skip back 15 seconds, or scrub within the tape that is on. The player shows how far behind live you are, and LIVE snaps back. (While paused you fall further behind each second)
• In-line timestamped comments and reactions: A comment is stored against the tape (its Archive identifier) and a second within it, not against a channel or an air date. It comes back at that second every time the tape airs, on any channel that carries it. I've linked up a discord to help moderate potential comments (there are none yet lol). Signing in to comment also joins you to the Discord. Reactions work the same way and require no account or Discord. Its a free for all. A reaction from someone within 10 seconds of your playhead floats up over your picture as it happens.
• Comments are permanent pins on the timeline and pop up over the picture as the playhead crosses them. I like to think of it as pop-up video cable graffiti.

Future plans:

• Marathon blocks
• GeoCities-accurate homepages for every channel with guest books and webrings.
• 90's chatroom skinned live chats from the discord server for every station.
• Machine-generated live synced English subtitles for foreign stations (big interest in vintage Japanese Game Show channels)
• Clipping for users and a leaderboard to browse and share clipped moments from live TV.
• More channels: I'm currently building a "horror hosts" B-movie channel for Halloween. Think Elvira and many other public access hosts from bygone eras showing terrible creature features.
  • I've also got infomercials, game shows, paranormal TV, and probably another 50 channels worth of stockpiled ideas ready to build!

Most of this was built from an initial prompt: "create a 3D pixel-art game using Three.js ... here are some results other have achieved: [screenshot] ... orchestrate sub agents using appropriate models and effort. Take as long as needed."

I use a 20x plan for work and had tokens to spare last weekend. The "take as long as needed" turned out to be about 12 hours, with my first prompt at 11:26 AM on Oct 4, with no messages from me until it finished around 11:25 PM.

I expected a short tech demo. Claude Code split the work across sub-agents, ran on its own for about 12 hours, and came back with a playable RPG: a village, a forest and a dungeon to explore, a party of four, and turn-based battles with weaknesses, shield breaks and boosts.

Since that initial prompt, I've played it through a few times, cleaned up rough edges through follow up prompts, added anonymous logging (which enabled finding and resolving shader issues on machines I don't have) and various small fixes.

The game has no image, model or audio files. Every texture, sprite, song and sound effect is generated in code when the page loads, and the whole first chapter is about a 4 MB download, free to play in your browser and takes about an hour:

https://rivetmothgames.itch.io/lanterns-of-aldermere

Many people have vibe-coded an application or a software product, some have even vibe-coded entire companies. Of course I’ve played around with a few fun vibe-coding projects, but for the first time I’ve actually “vibe-coded” a real physical product!

This all started when my wife and I wanted to get our son a live-updating MLB scoreboard for his birthday. We found one that looked good, but it was a little expensive for what it did, and I immediately thought to myself, "Hey, I wonder if I could build this?"

Turns out the answer is a big yes! I’ve always played around with computers and Raspberry Pis, but until now I hadn’t really built much more than blinking lights or a dog bark detector to tell me when my dog wanted to come inside. But over the past few months, I worked with ChatGPT/codex and Claude Code during nights and weekends to build the concept, make a web preview, come up with the parts needed for this scoreboard, including 3d-printing a case that screwed into the back!

Once I realized how easy it was to add new things, I kept adding more features like arcade games, NFL scores, live updates for his baseball games and practice schedule from GameChanger, and quiet mode so it can’t be used after a certain time at night.

Take a look at the GitHub repository for more details, and I’d love to hear from you if you try to make one of these scoreboards yourself!

I took a Java course in college, so I understand the basics of coding and can generally follow how it works. I also have some experience with Python. For example, on my YouTube channel, I transcribe videos and feed the transcripts into AI to generate descriptions for videos in a playlist. I used to run faster-whisper through the terminal, but that became annoying. So now, I created my own whisper transcription app using Claude Code.

Claude Code is surprisingly impressive because it can test things in the background and analyze how they actually work. It can even say, almost like a human, "I didn’t like the way that worked; let me try something different." The ability to manipulate the environment and build sandboxes before deployment is incredibly useful. If you have a working system and an idea for improvement, Claude Code recreates it in a sandbox, applies the update, and tests it before deploying to production. That way, if something breaks, it doesn’t affect the real system.

This is pure magic. Truly amazing.

PG&E came by and confirmed it was a minor gas leak in our heater. They’re fixing it up right now.

Disclaimer that I don't know how to code, and this is my first project of this sort. But it seems that the barrier to entry is so low now that even I can make something functional.

I now use a system with Claude and Muse to handle my meal planning, grocery orders, tracking recipes, pantry inventory, meal feedback, and interface in the kitchen. The way it works is Claude comes up with a two week meal plan based on my households preferences, and feedback provided from last cycles meals, and submits it for review. After approval, Claude then creates a Walmart grocery list for the next two weeks, orders any pantry staples that I am low on + other items I add to the list, and creates a google doc of the shopping list in a dedicated folder. Muse then accesses the google doc to get the grocery order, and uses its dedicated browser to place the order (with my supervision from my phone to hit final pay confirmation).

I also had it create an interface that shows the meal plan, recipe for the night, when to thaw out proteins, shopping list, and feedback. I have this interface on a cheap tablet in the kitchen locked in kiosk mode.

Any improvements to suggest?

EDIT to include github: https://github.com/weezerhunter/Supper-Board

Lots of changes over the last few months. Hard to keep track of. Here are all 21 Anthropic help articles, doc pages and release notes on the migration combined in one visualization.

Next milestone is October 6th. If you haven't seen it already, all new sessions in the Claude app on Pro/Max will be cloud only. No more local option. Tasks you already started locally stay local. Claude Code is still the local option.

Team/Enterprise admins still decide location ATM, no specific date yet.

All references in full article.