Describe it.
Watch it rise.
An AI building companion for Minecraft. Type a request in chat and it designs, self-reviews, and places an original build — houses, whole scenes, even sculpts like a fountain shaped like a banana.
Free to try — 15 builds a day, no account.
> /bm a cosy japanese cottage with a koi pond
✦ Conjuring your build… ⏳
I improvised a japanese-style cottage — 1,204 blocks. Hip roof, paper windows, a koi pond off the south path. Self-review: good.
✦ Placing 1,204 blocks… (326/tick)
Three words to a finished build
Type what you want
In-game chat: /bm a cosy japanese cottage with a koi pond. Plain English — no coordinates, no build tools.
It designs & self-reviews
Buildmancer improvises an original design in a learned style, renders it, critiques its own work, and fixes mistakes before you ever see them.
It builds in your world
The plan is placed block-by-block on the server thread, batched per tick — singleplayer or on a Fabric server.
Real commands, real builds
Every card is an actual /bm build, rendered by Buildmancer's own isometric engine — the same view it self-reviews with.
house/bm a cosy japanese cottage
Learned style + palette, self-reviewed.
sculpt/bm a fountain in the shape of a banana
A banana silhouette, welling water in a stone basin.
sculpt/bm a lantern in the shape of a star
Glows — it picked sea-lanterns on its own.
house/bm a cute house that looks like a bird
Shape request routed to the sculptor, then made liveable.
sculpt/bm a house in the shape of a pyramid
Hollowed, floored, and a door cut in.
sculpt/bm a golden throne shaped like a dragon
Function + material straight from the words.
Not a schematic dump — an AI that thinks about the build
It designs, then judges itself
A build is rasterised, rendered, and critiqued by the AI before it's returned. Bad ideas get fixed automatically — you get the good version.
Sculpt mode
Shapes the box engine can't say. Ask for a cat, a dragon, a banana — it describes the subject as solids, looks at the result, and refines the silhouette.
Function & material from words
“a lantern shaped like a star” glows. “a golden throne shaped like a dragon” is gold. It reads your intent, not just the shape.
Whole scenes
“a cottage with a fountain, two oak trees and a cat statue” lays out a garden — paths, plinths, symmetry — not just one building.
Learns your styles
/bm learn a schematic and it improvises brand-new builds in that spirit — palette, proportions, roof grammar — never a copy-paste.
Refine in place
/bm edit “taller”, “add a tower”, “in stone” — it reworks your last build without you starting over.
Free to play. Buy credits when you want more.
1 credit = a house or scene · a sculpt = 5 credits
- ✓ Refills every day
- ✓ Every command unlocked
- ✓ Great for trying it out
- ✓ Best value per credit
- ✓ Never expires
- ✓ Delivered as a code to redeem in-game
- ✓ Auto-refills monthly
- ✓ Cancel anytime
- ✓ Best rate for regulars
One-time packs also available: $5 → 150 credits · $15 → 500 credits · $40 → 1500 credits. Codes delivered by email, redeemed in-game with /bm token.
Download & drop it in
- 1Install a Fabric profile for Minecraft 1.21.11.
- 2Put buildmancer-0.1.3.jar and Fabric API into your mods/ folder.
- 3Launch, enable cheats, and type /bm a cosy cottage.
- Minecraft Java 1.21.11
- Fabric Loader + Fabric API
- ~2 GB RAM · no GPU
- Singleplayer or a Fabric server
No config needed — it connects to the build service out of the box.
Good questions
Does this work on any Minecraft version?+
Right now the mod targets Java Edition 1.21.11 with Fabric. Bedrock isn't supported. Newer versions arrive as mappings are published.
Do players on my server each need to install it?+
No. On a Fabric server you install the mod once (server-side). Players just run /bm — they need nothing installed. It won't load on Paper/Spigot/Bukkit, though.
What's a “credit”?+
One build. Houses and scenes cost 1 credit; a detailed AI sculpt costs 5 (it does several vision-guided refinement passes). You get a free daily allowance, and can buy more.
How do I pay and redeem?+
You'll buy a credit pack on this site, get a code by email, and redeem it in-game with /bm token. (Payments are being finished — the mod itself is free to download and play now.)
Is my world data sent anywhere?+
Only your text request plus a small patch of ground heights around the build site go to the build service, so it can sit the build on your terrain. No inventory, chat history, or account data.
Your next build is one sentence away.
Download the mod, type what you're imagining, and watch it go up block by block.