Architect

Describe a building, or mark a plot on the ground. Claude designs it as parametric code, checks it against the rules for its building type, and renders previews. You review it as a translucent ghost on the real terrain, place it, and keep it in a library where new variants cost nothing.

• Designs as code. Each design is a small JavaScript program with a few parameters of its own (width, floors, a porch) and every material read from a palette.
• Checked before you see it. Each building type has a checker. The hard rules are vanilla blocks only, a working door and a lit interior.
• Exact Remove. Everything a building covers is saved first, so Remove restores the land block for block.
• Survival mode. Place puts down a construction site, and the building goes up as you feed it materials.

It's a Fabric mod for singleplayer that starts its own small Node helper to run the Claude design agent, so there's nothing to set up.