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Hands-On iii

Hands-On iii
This book is 40% completeLast updated on 2026-10-12

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About

About

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Author

About the Author

Ian Johnson

Ian Johnson is a staff engineer at Parento, where he runs the engineering team's adoption of AI coding agents and the harness work that keeps that adoption from breaking in production. He owns and operates Fulcorum, a video learning platform that teaches agentic engineering. He wrote five open-source projects that support reliable AI output: Keystone, Open Refinery, Sigma, Ghola, and Gauge. He has been writing about this work at blog.tacoda.dev since 2024 via Medium and the DEV Community. He lives outside Austin with his family.

Contents

Table of Contents

How to use this book

  1. What you need
  2. The repo, one tag per chapter
  3. What it costs
  4. Pins, and the text that will change

Chapter 1: The same problem with a different name

  1. The question every team answers by hand
  2. Agents are different, and that changes which answers fit
  3. iii in ten minutes
  4. When to use something else
  5. The reach order
  6. Where the build ends: lights-on

Chapter 2: An engine, the harness worker, and a console

  1. Two kinds of worker
  2. The key the router reads
  3. Up, status, down, and one raw turn
  4. Reading the trace

Chapter 3: Configuration, settings, and scripts

  1. Three places a value can live
  2. The directory you do not own
  3. Compose keys, scripts, and start order
  4. Settings with provenance
  5. A turn from a script

Chapter 4: Phases and grants

  1. A phase is a named kind of turn
  2. The tools come from a stock worker
  3. A phase picks its provider
  4. Rung 1 gates discovery too
  5. Replaced, never merged
  6. Every send carries its root

Chapter 5: The charter at rung 0

  1. What the script reads
  2. Into the send
  3. A budget for the charter
  4. What a script cannot do
  5. Proving it with two tokens

Chapter 6: Oversight, holds, and the person in the loop

  1. The default that deadlocks
  2. Four levels on one dial
  3. A held call, and the answer
  4. ask never becomes allow

Chapter 7: The ladder, your first worker

  1. A worker is a process that registers functions
  2. A rule has a rung, a layer, and a policy
  3. Refusing at pre-trigger
  4. The repository’s permissions, and ask
  5. One function in TypeScript

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