Geometry Nodes in Python

Trigger

Use this skill when the user:

• Wants to build a Geometry Nodes tree from a script rather than the editor
• Mentions GeometryNodeTree, node_groups.new, tree.interface, tree.links.new
• Needs to apply a generated GN tree as a modifier on an object
• Asks about Bundles, Repeat Zones, or for-each Element zones from Python

High-level shape

The Python pattern for building a Geometry Nodes tree has four phases:

1. Create the node group and its interface (input and output sockets).
2. Instantiate nodes by their exact RNA bl_idname.
3. Wire nodes with tree.links.new.
4. Add a NODES modifier on the target object that points at the group.