The Harness Is the App

The thing users touch isn’t the model; it’s the harness around it: a loop, a filesystem, tools, memory. Coding agents proved how good that harness can be, and nothing about it is specific to code. Point it at any domain and the app falls out; plain files you own, compute sitting on top of your data, an AI that edits alongside you instead of holding it hostage.

It’s a local-first story in disguise: own the substrate, own the loop, and let the software reshape itself to the moment. The harness is the app.