Mario’s Newsletter

The Factory Must Grow (Part VI): Can I Leave It Alone Yet?

tl;dr: I started building an orchestrator because I wanted to walk away from the keyboard and trust AI's outputs. I'm still working on it.

Sep 14 • Mario Hayashi

July 2026

The Factory Must Grow (Part V): Avoid Letting AI Mark Its Own Homework

tl;dr: Same model writing code and reviewing the PR is “marking its own homework”. AI agent orchestrator hands code review to a different vendor's…

Jul 1 • Mario Hayashi

May 2026

The Factory Must Grow (Part IV): Testing AI To Walk Away From the Keyboard

tl;dr: I'm building an AI orchestrator that ships code without me. The only way to know if it works is an end-to-end test harness that verifies happy…

May 15 • Mario Hayashi

The Factory Must Grow (Part III): Stopping the AI Agent Production Line Toyota-style

tl;dr: My AI orchestration system silently dropped a dozen PRD issues and auto-closed them. 😱 To fix it, I had to stop the line and root cause every…

May 4 • Mario Hayashi

April 2026

The Factory Must Grow (Part II): From Spaghetti AI Agent Orchestrator to a Main Bus

tl;dr: In Part I, I built the factory: an orchestration system that runs AI agents like workers on a production line. Part II tears the original system…

Apr 28 • Mario Hayashi

The Factory Must Grow: I Replaced Myself With AI. Now What?

tl;dr: I made an AI orchestration system that creates PRDs, writes code, opens PRs and handles review feedback. And then I realised I’d automated myself…

Apr 15 • Mario Hayashi

An autonomous dev pipeline for one

tl;dr — How I use bash, cron, tmux and Claude in a loop that picks up tasks, writes code, opens PRs and handles review feedback while I focus on the…

Apr 6 • Mario Hayashi

Google Merchant Center Suspension for Misrepresentation? Where to Start Looking

tl;dr: Google says your store info doesn’t match. Fix price, schema, policies, and business details, then appeal with “I disagree” if it’s still wrong.

Apr 6 • Mario Hayashi

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March 2026

Using AI to make Xero expense auditing fast, cheap, and (almost) fun

Deterministic code first, AI second: how I automated Xero expense audting with Claude Haiku.

Mar 23 • Mario Hayashi

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AIパーソナルアシスタントをOpenClawで構築してみた

メール要約からPineconeで動くセカンドブレインまで、可能性は思った以上に広かった。

Mar 13 • Mario Hayashi

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I Set Up an AI Personal Assistant with OpenClaw

How I set up OpenClaw as a personal AI assistant: email summaries, calendar events, and a Pinecone-powered second brain.

Mar 12 • Mario Hayashi

October 2025

Better AI code with strong constraints: Ban it() for it.each()

tl;dr: Set hard constraints on AI-generated code — like banning it() in favor of it.each() — to make it more scannable and reviewable

Oct 17, 2025 • Mario Hayashi