---
title: "The Emotix.co evals stack, in detail"
description: "What we learned shipping an agentic product to real users."
author: "Aqshin Rajabov"
publisher: "Emotix Co."
published: "2025-11-03"
category: "product"
canonical: "https://emotix.az/journal/emotix-co-evals-stack"
language: "en-US"
read_minutes: 14
---
# The Emotix.co evals stack, in detail

*What we learned shipping an agentic product to real users.*

Emotix.co is an agentic platform for founders. It takes an idea and returns a validated product brief, market research, competitor analysis, personas, and a landing page, in under a week. The hardest engineering problem is not generating any of those artifacts. It is knowing when the generation is wrong.

## The stack

We run four eval layers: structural validators on every model output, golden-path regression tests on every deploy, model-graded rubric scores on every production run, and weekly human review of a random sample. Each catches a class of failures the others miss.

## What we learned

The rubric judges drift. The structural validators are load-bearing. The human sample is the most expensive layer and the least replaceable. We would not ship without any of them.

> The human sample is the most expensive layer and the least replaceable.