I am seeing essentially deterministic results with Terra running a custom browser automation agent across >100 interaction events.

The harness is everything. If I just threw something like Codex at this and said "good luck" I wouldn't make it beyond 5-10 interactions. I tried that already. Carefully designing the views and tools over the environment is where you can go from 50% to 99.9999%.

Curious about what you found. I agree harness for browser automation is vital - I work on https://libretto.sh