https://khoa.work/writing Notes on design, code, and life, from Khoa in Hội An. Full content, latest 30. en https://khoa.work/writing/agent-write-to-production https://khoa.work/writing/agent-write-to-production Thu, 02 Jul 2026 00:00:00 GMT The moment an agent writes to production instead of just reading it is where things break. Six rules that make it safe — and why default-deny is the whole game. https://khoa.work/writing/agent-on-a-live-store https://khoa.work/writing/agent-on-a-live-store Thu, 02 Jul 2026 00:00:00 GMT Setting up custom-made products by hand took me six months for one line. A guard-railed AI agent did a collection in a week — how, and why to start now. https://khoa.work/writing/measuring-ai-citations https://khoa.work/writing/measuring-ai-citations Fri, 26 Jun 2026 00:00:00 GMT There's no Search Console for ChatGPT. Here's how I track whether AI is citing a brand — the proxies, the manual checks, and what's actually worth watching. https://khoa.work/writing/llms-txt https://khoa.work/writing/llms-txt Fri, 26 Jun 2026 00:00:00 GMT A tiny markdown file that hands AI a clean map of your site. What it does, how to write a good one, and an honest take on whether it's working yet. https://khoa.work/writing/legible-to-ai https://khoa.work/writing/legible-to-ai Fri, 26 Jun 2026 00:00:00 GMT Before an AI can cite you, it has to read you. Server rendering, clean structure, and schema are the line between being quoted and being skipped. https://khoa.work/writing/generative-engine-optimization https://khoa.work/writing/generative-engine-optimization Fri, 26 Jun 2026 00:00:00 GMT GEO isn't a new dark art — it's SEO pointed at machines that answer instead of rank. The whole playbook: who's reading, what gets cited, and how to measure it. https://khoa.work/writing/two-different-animals https://khoa.work/writing/two-different-animals Thu, 25 Jun 2026 00:00:00 GMT Half of SoiTarot is built for machines to crawl. The other half is built for a person to play with. They share a brand and almost nothing else. https://khoa.work/writing/the-fence-around-the-machine https://khoa.work/writing/the-fence-around-the-machine Thu, 25 Jun 2026 00:00:00 GMT When generating a page costs nothing, the page isn't the product. The gate that decides whether it ships is. Here's how I built that gate for SoiTarot. https://khoa.work/writing/the-bottleneck-moved https://khoa.work/writing/the-bottleneck-moved Thu, 25 Jun 2026 00:00:00 GMT I built a thousand-page site in about a week with a room of AI agents. The interesting part wasn't the speed — it was where the bottleneck moved to. https://khoa.work/writing/ship-evidence-not-features https://khoa.work/writing/ship-evidence-not-features Thu, 25 Jun 2026 00:00:00 GMT How I'm building a marketing tool by proving it works — one side-by-side demo at a time — instead of stacking features nobody trusts yet. https://khoa.work/writing/one-house-style https://khoa.work/writing/one-house-style Thu, 25 Jun 2026 00:00:00 GMT The thing that keeps a thousand AI-generated images from reading as slop isn't a better model. It's one art direction, held without mercy. https://khoa.work/writing/motion-under-a-cwv-budget https://khoa.work/writing/motion-under-a-cwv-budget Thu, 25 Jun 2026 00:00:00 GMT How SoiTarot got animation that feels alive on the interactive pages without wrecking performance across fifteen thousand SEO ones. https://khoa.work/writing/mcp-first-marketing-ops https://khoa.work/writing/mcp-first-marketing-ops Thu, 25 Jun 2026 00:00:00 GMT Why I wrapped every data source — Shopify, Meta Ads, Search Console — as its own MCP server instead of one big script. The boring decision that makes it composable. https://khoa.work/writing/marketing-engineering https://khoa.work/writing/marketing-engineering Thu, 25 Jun 2026 00:00:00 GMT I named it Jarvis. It pulls every scattered marketing number — Meta, Google, TikTok, Search Console — into one place a business owner can actually read. https://khoa.work/writing/inbox-that-drafts-itself https://khoa.work/writing/inbox-that-drafts-itself Thu, 25 Jun 2026 00:00:00 GMT The newest slice of Jarvis: a support inbox that reads the thread, checks the order, and writes the reply — as a draft, never sent. https://khoa.work/writing/designing-a-brand-before-code https://khoa.work/writing/designing-a-brand-before-code Thu, 25 Jun 2026 00:00:00 GMT How SoiTarot got a look before it got a build — three directions, one locked art direction, and a design system a machine could hold the line on. https://khoa.work/writing/combinatorial-seo https://khoa.work/writing/combinatorial-seo Thu, 25 Jun 2026 00:00:00 GMT Why one person can win a content-hungry niche: a lot of search demand is just combinations, and combinations are exactly what a system is good at. https://khoa.work/writing/answer-engines https://khoa.work/writing/answer-engines Thu, 25 Jun 2026 00:00:00 GMT I did the AEO work — llms.txt, structured data, doors open to every AI crawler. ChatGPT still hasn't cited SoiTarot once. Here's why that's exactly what I'd expect. https://khoa.work/writing/a-room-of-agents https://khoa.work/writing/a-room-of-agents Thu, 25 Jun 2026 00:00:00 GMT One agent doing everything is a mess. The trick to building SoiTarot solo was a small team of them that could hand work off without me in the middle. https://khoa.work/writing/cost-of-a-default https://khoa.work/writing/cost-of-a-default Mon, 02 Feb 2026 00:00:00 GMT Every default is a decision someone made for a thousand people. Most of them are wrong. Here's what I changed, and what it cost me to find out. https://khoa.work/writing/shipping-slowly https://khoa.work/writing/shipping-slowly Wed, 12 Nov 2025 00:00:00 GMT A defense of the unhurried build, written for an audience of one — me. Why shipping slowly is a feature, not a bug, when the work is the point.