NOTES

What we built,
and what we learned building it.

The product pages describe what Selvage does. The proof pages report controlled measurements. These are the dated notes in between — why a thing was built, what surprised us, and where we were wrong. They are written to be read once and to age honestly.

Note · Sep 2026

Agents write the code.
Approving it is the hard part.

Why a small team carrying its own product and two client platforms built an engineering harness instead of waiting for better models — and what happened when we did the same task twice, once by hand and once from one command, against an evaluator frozen before either run.

Read the note →

Looking for the numbers instead? The proof pages carry the controlled measurements, their methodology, and their limits.

What we built,and what we learned building it.

Agents write the code.Approving it is the hard part.

What we built,
and what we learned building it.

Agents write the code.
Approving it is the hard part.