You “Otter” Do AI Evals—Here’s What They Are, How to Get Started, and How Not to Fail

Source: Nate’s Newsletter Date: 2025-04-29 URL: https://natesnewsletter.substack.com/p/you-otter-do-ai-evalsheres-what-they

Summary

AI evaluations are risk-management infrastructure, not an engineering nicety — billions have been evaporated by companies shipping AI without systematic testing. Nate’s case for evals is framed as standard business practice: “Would you let your software team yeet stuff into production at 4:30 PM on a Friday with zero testing?”

Implications

AI economics thread. The table of large companies with public eval-related failures is the most concrete cost-accounting argument for eval investment — not benchmarks, not theoretical risk, but documented capital destruction. The business case for evals is a cost-avoidance argument, not a quality-of-life argument.

Agent product strategy thread. Evals as non-developer practice is the structural implication — if agents are deployed by product and ops teams who lack engineering eval frameworks, every organization without eval culture is shipping untested AI into production. The gap between who can build agents and who knows how to test them is the risk surface.

Watch: Whether eval tooling matures into a productized layer (not just engineering practice) that non-technical teams can operate, and whether eval-related failures continue at high rates despite widespread coverage of the problem.