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Foundational doctrine

The model is rented; the harness is owned.

The durable competitive asset in agentic delivery is the harness — tests, evals, review patterns and a versioned context layer — that lets generated change be judged correct fast. The model is a commodity input.

Conventional wisdom

Pick the best model and you win.

Our position

The model is rented. The harness is owned.

Why we believe it

The durable asset is not the model — it is the context, evaluation, review and governance system around it that closes the acceptance gap.

What we’ve observed

  1. 01Spec/eval-driven harnesses turn acceptance criteria into executable gates; the model alone rarely closes the acceptance gap.

Challenge the thinking

If you are choosing a model when the leverage is really in the harness around it — tests, evals, context, review — we would compare notes. Or tell us you think the model still matters more.

Model or harness — where’s the leverage? →