Vizuara AI Labs
Vizuara Harness Engineering
Build the layer that turns a model into an agent. A pi-style coding harness, from scratch. A worklog that builds a real coding agent from an empty file — the loop, the tools, the context engine, the recovery, the orchestration — every layer built and explained by hand.
01
The Book
The full knowledge base — an illustrated worklog that builds a coding-agent harness from scratch, in the spirit of pi: the loop, tools, context engine, durability and orchestration.
02
Pi from Scratch
How the real pi coding agent (earendil-works/pi) actually works, built up one layer at a time from its own source — the loop, toolbox, safety, system prompt, execution env, context, cache, subagents, surfaces and extensions.
03
The Workshop
Vizuara's five-day live Harness Engineering cohort. Each day builds one layer of your own pi-style harness, with the full book included.
04
Projects
Build it with your hands — the bare loop, real file & shell tools, a context engine that compacts and remembers, checkpointed recovery, and your own harness capstone.
05
Interactive
Practice, not just read: per-section quizzes on the loop, tools, context, durability and orchestration.
Models are commodities. The harness is the product.
Everyone calls the same APIs. What separates Claude Code, pi and Hermes from a thousand dead demos is everything wrapped around the model: the loop that keeps it working, the tools that let it act, the context machinery that keeps it sane, and the recovery systems that keep it alive. This book builds all five layers from scratch.