Human-on-the-bridge: supervise the steering, not every step.

A mid-June paper (arXiv:2606.16871) proposes scalable agent evaluation where humans oversee the few high-leverage decision points instead of reviewing every trajectory, shipping an open ProofAgent Harness for auditable evaluation. It targets the real bottleneck, evaluation not keeping pace with agent autonomy. This is the practical version of Karpathy's verifiability thesis. Route only the decisions where human judgment changes the outcome to a human, and automate provenance capture for the rest.