Reusable surfaces only: APIs, plugins, loaders, evaluation helpers, and implementation notes that could speed up future XR+AI builds.
Tools notes explain reusable implementation surfaces, not every helper script or demo shortcut.
APIs, loaders, interaction primitives, plugins, evaluation helpers, and deployment notes that reduce future build time.
Prototype-only glue code that has not survived more than one scenario.
The useful boundary is between stable primitives, experimental adapters, and one-off demo code.
Current notes compare what helps iteration speed: interaction affordances, scene loaders, spatial anchors, WebXR surfaces, and headset deployment friction.
Favor predictable scene loading and input diagnostics before adding another visual layer.
Track headset setup, build size, permissions, and network assumptions as architecture constraints.
If a tool only exists to support one demo, it belongs in the prototype notes, not here.