Get Loopy! Act, React, Iterate Until We Love It

An agent is a week into rewriting my memory system's retrieval code. It built a deterministic scorer, ran dozens of experiments, kept the good ideas and ditched the failed ones, all from one prompt I wrote at the start. Loop engineering is the third act of agentic engineering: the agent acts, observes the result, feeds it back into its own context, and goes again until the goal is true. Here's two years of building these loops, with receipts.