Two agents have action habits — how often each reaches for read, search, edit, test, think. Drag the bars to reshape either agent. Jensen-Shannon divergence asks one thing: how differently are the two mixed? 0 means identical habits, 1 means nothing in common. It works by building the blend halfway between them and measuring how far each agent sits from that blend.

The tick marks show where real agent pairs actually land: two models in the same scaffold sit at JSD ≈ 0.001 (nearly identical habits), while two different scaffolds sit at ≈ 0.16. Almost the entire 0–1 range is empty — which is the point: the scaffold moves an agent's procedure far more than the model does.