Mars will not be settled by intelligence alone. It will be settled by teams that convert intelligence into reliable, verifiable, and accountable physical action - and the bottleneck is not compute. It is the path from uncertain evidence to an approved engineering result. In this grounded, evidence-driven book, engineer and harness-builder Bob J Mills presents the architecture behind that conversion: the Mars Harness. Not a chatbot, not a single agent - a staged intelligence layer (Discover → Engineer → Verify → Deliver → Evolve) in which specialized AI harnesses for science, engineering, and program execution work through explicit work-product contracts, ground-truth gates, and human approval. Inside, you will learn: - Why the seven functions of a harness - orchestration, instructions, tools, context, memory, subagents, and guardrails - matter more than which model runs underneath- Why skills outlast agents, and how the durable capability catalog turns people, models, solvers, and robots into interchangeable executors- How every claim carries an epistemic status - Observed, Derived, Assumed, or Unknown - with provenance recorded separately, so a plausible sentence can never silently become a physical fact- How the structured handoff (the Engineering Evidence Package) and the return path (the Research Request Package) close the loop between science and engineering- How mission memory compounds: preserving evidence, decisions, dissent, and lessons across people, tools, and model generations>=98% - to a modeled settlement-scale scenario of 592 tonnes over 730 days, with every modeled number labeled as modeled>Grounded in the author's Mars Society 2026 presentation and his real open-source harness projects (Hypatia Pro, Intelligent Engineer Pro), this is a practical architecture for making AI into structured engineering capacity - on Mars, and on Earth. Model = intelligence. Harness = mission capability. Fans of rigorous, systems-level thinking on AI and aerospace - readers of engineering-driven nonfiction on space settlement - will find here a book that respects the evidence as much as the ambition.
