CUL — Computer Use Laboratory

Synthetic computer-use scenarios in one controlled browser environment. The loop is observe, act, verify: targeting, approval and result checking stay inside the same bounded run. There is no live model and no access to a real desktop.

Six scenarios: stable interface, shifting layout, ambiguous target, blocked interaction, uncertain outcome and an approval boundary.
Coordinate targeting and semantic targeting, compared side by side.
Single-use approval bound to the exact target and content.
Separate observed evidence and internal verifier state.
A read-only run trace and a Methods page with sources.

This interactive laboratory needs JavaScript. Its environments and records are synthetic teaching fixtures, not observed computer use.