a builder's codex
codex · patterns · Substrate runs the loop; humans run alignment and taste

Substrate runs the loop; humans run alignment and taste

Convergence

Across PMM, growth, evals, and product, operators converge on the same shape: agents/automation own the inner loop (execution, retrieval, draft generation, experiment plumbing), and humans own the outer loop (alignment, taste, kill decisions, mission framing). The boundary is not "human-in-the-loop review" — it is a clean role split where humans never compete with the substrate on volume.

Operators

Variation

Implication

For any AI-native function, name the inner loop (what the substrate runs) and the outer loop (what only humans decide). Resist the urge to put a human reviewer in every step — that re-introduces the queue. The PMM/PM/leader's job becomes alignment design (kill criteria, named taste calls, eval structure), not approval throughput.

Sources

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