How we went from observability to evaluation: Golden datasets, RAGAS metrics, and LangFuse feedback loops that made agent quality a measurable number.
Agentic RAGLangFuseRAGASGolden Datasets
The Problem
After we shipped our Ecosystem Agent, the agentic RAG system that unified Docs, Academy, Storybook, and Marketplace behind a single Ask-AI, the roadmap did what roadmaps do. Better re-ranking. New indexing strategies. Model upgrades. Prompt refinements.
Every enhancement raised the same question: did this change make the system better, or did it quietly break something?
For a while, we answered it manually, running a fixed set of real developer questions against the system and reviewing every answer before release. It worked, barely. And it made one thing obvious: manual verification of intelligence does not scale. It was becoming the bottleneck on our own velocity.
Shipping an agentic system without evals is a blind game.
The team's response was the same as last time. Don't add more process. Build the missing layer.