TL;DR of the paper, generated automatically.

MesoCraft is a browser-based tool for building mesoscale models of cells from user-defined procedural rules.

• Who it's for: structural biologists, according to the abstract.
• How it works: user-defined rules generate collections of molecular instances, while a geometry-node editor and visual feedback support authoring and revising their spatial relationships.
• Beyond modeling: researchers can inspect molecular organization and create guided animations that highlight key spatial relationships, linking modeling, exploration and explanation in one workflow.
• Availability: the abstract points to a demonstrative deployment of the tool. The paper is a v1 submitted to arXiv on 27 October 2026.