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Building an LLM Robot with My Son — EP 9. 4-Month Retrospective, and What Comes Next When I wrote EP 0, there was a half-assembled acrylic chassis on the desk with one wheel turning in reverse. Now that robot walks to the kitchen on its own and finds a water glass. Can't pick it up — but it finds it. Four months. What Worked The agent harness approach held up Injecting domain knowledge through CLAUDE.md worked better than expected. The repeated context fatigue disappeared — AI wrote code that respected the project's rules without having to be reminded every session. The file started at ten lines and grew to 120. That growth is a record of the project itself. My son completed a behavior through eight prompts The scene from EP 5 is the one that stays with me. He sat down alone, iterated eight prompts, and built a working obstacle avoidance behavior. Never touched a line of code. "I made this" was not wrong. Apple Silicon local LLM actually works 112 tok/s on ...