https://www.parkjunwoo.com/tech/Recent content in Tech on Architect PARK JUN WOOHugoenFri, 10 Jul 2026 20:00:00 +0900https://www.parkjunwoo.com/tech/markitdown-install-and-ocr-setup/Fri, 10 Jul 2026 15:00:00 +0900https://www.parkjunwoo.com/tech/markitdown-install-and-ocr-setup/The reason to use MarkItDown comes down to the agent-operable condition — Microsoft’s own conversion of its own formats is structurally trustworthy. Installation, usage, and how to bolt on OCR at the exact point that trust breaks: image-only PDFs.https://www.parkjunwoo.com/tech/what-is-turn-of-reins/Tue, 07 Jul 2026 09:00:00 +0900https://www.parkjunwoo.com/tech/what-is-turn-of-reins/An anatomy of the turn, the smallest unit of execution in reins. What is not recorded is not a turn — from this one definition, driver independence, restart resilience, and auditability all follow. Compared against the June 2026 Loop Engineering discourse, we see how the turn converts those recommendations into structure.https://www.parkjunwoo.com/tech/tangeul/Fri, 03 Jul 2026 10:00:00 +0900https://www.parkjunwoo.com/tech/tangeul/TANGL lets you write toulmin rule graphs as markdown sentences instead of Go code, so a non-programmer can audit them. TANGEUL is the binary source of truth those markdown surfaces now encode into.https://www.parkjunwoo.com/tech/why-smart-models-cant-explain/Thu, 25 Jun 2026 00:00:00 +0900https://www.parkjunwoo.com/tech/why-smart-models-cant-explain/Smart models speak in hard-to-follow language; models that explain clearly are weak at reasoning. Use both. A concrete method for splitting a communication model (main) and a reasoning model (subagent) in Claude Code, and why this structure works.https://www.parkjunwoo.com/tech/abloq/Thu, 11 Jun 2026 20:00:00 +0900https://www.parkjunwoo.com/tech/abloq/Hand a blog to an agent and the articles come out. The problem is you can’t trust them — it fabricates sources, bumps the lastmod of an article it never touched, and edits files no one asked it to. If a human has to inspect every line, there was no point delegating. abloq’s answer is a division of labor: generation is probabilistic, verification is deterministic. The only thing a human writes is a single insight specification (insight.yaml); authoring, translation, refresh, and evidence work are carried out by agents as quests; and quality is guaranteed by a deterministic gate derived from a single blog.yaml. A locked PASS is irreversible — the agent may be disposable, but progress accumulates.https://www.parkjunwoo.com/tech/reins/Fri, 05 Jun 2026 20:00:00 +0900https://www.parkjunwoo.com/tech/reins/how-make-quest taught you to build a quest CLI with your bare hands. But build a second CLI and you write the same ratchet, the same scan/next/submit, the same tallying all over again. reins pulls that invariant out into a framework — reins supplies the ratchet, the command skeleton, the tallying, and export; you implement only your domain’s gate (the four methods of gate.Definition). The gate is a catalog of cheese-defense rules, and the toulmin defeat graph hands the agent a strategy guide for ‘why you lost and what to change to win.’https://www.parkjunwoo.com/tech/how-make-quest/Wed, 03 Jun 2026 10:00:00 +0900https://www.parkjunwoo.com/tech/how-make-quest/AI says “Done.” In reality, it isn’t finished. This article is about building the tool that solves that problem — a quest CLI — with your own hands. From the principle (why) to the cobra command skeleton (how), this single article is enough for an agent to build a Go quest CLI. huma is the worked example.https://www.parkjunwoo.com/tech/filefunc-hono/Sat, 30 May 2026 11:00:00 +0900https://www.parkjunwoo.com/tech/filefunc-hono/I refactored Hono — a production framework with 23k stars — using filefunc. All 4,419 tests passed. Then I measured: the median lines an agent reads to grasp one concept dropped 71%, from 60 to 18. File count isn’t the point — read length is.https://www.parkjunwoo.com/tech/geo-for-ai-visibility/Wed, 27 May 2026 21:00:00 +0900https://www.parkjunwoo.com/tech/geo-for-ai-visibility/If your content isn’t cited in AI-generated answers, you might as well not exist. According to the GEO paper, cite sources +30%, add statistics +32%, add quotations +41% visibility improvement. Infrastructure, sitemaps, Wayback Machine, paper citations, social activity — five axes to secure AI visibility.https://www.parkjunwoo.com/tech/huma/Tue, 26 May 2026 23:00:00 +0900https://www.parkjunwoo.com/tech/huma/When you ask an AI agent to test 42 endpoints, it declares ‘done’ around the 15th. huma turns the endpoint list into a ratchet session so the agent cannot skip a single one. scan, next, write, verify. Four commands, zero config.https://www.parkjunwoo.com/tech/codistill/Tue, 26 May 2026 18:00:00 +0900https://www.parkjunwoo.com/tech/codistill/Do you have to start from SSOT to use yongol? No. codistill auto-extracts OpenAPI, DDL, and sqlc queries from existing code across 16 web frameworks in 8 languages. Not foundation work – seismic retrofitting.https://www.parkjunwoo.com/tech/hurl-vibe-coding-drift/Fri, 22 May 2026 16:00:00 +0900https://www.parkjunwoo.com/tech/hurl-vibe-coding-drift/Vibe coding collapses under logic drift within 3 months. CMU, METR, DORA, and Amazon cases prove it. Declare API contracts in plain text with Hurl and lock them with a ratchet – you suppress drift structurally without limiting AI’s freedom.https://www.parkjunwoo.com/tech/ifeval-ratchet/Wed, 20 May 2026 14:00:00 +0900https://www.parkjunwoo.com/tech/ifeval-ratchet/LLM sycophancy bias is not a bug but an asset. Combine the instruction-following ability that IFEval measures with deterministic feedback, and even a 4.5B local model produces a convergence loop that generates correct code.https://www.parkjunwoo.com/tech/yongol/Mon, 18 May 2026 16:00:00 +0900https://www.parkjunwoo.com/tech/yongol/Vibe coding collapses at 200 endpoints because AI cannot distinguish decisions from implementation details. yongol shifts the AI workload from code to 10 declarative specs and enforces cross-layer consistency before compilation. Harness with reins.https://www.parkjunwoo.com/tech/ratchet-pattern/Fri, 15 May 2026 14:00:00 +0900https://www.parkjunwoo.com/tech/ratchet-pattern/I asked an AI agent to write tests for 527 functions. It stopped at 40 and declared ‘done.’ The Ratchet Pattern forces completion by delegating the done/not-done decision to a mechanical verifier — so the agent keeps going until the machine says stop.https://www.parkjunwoo.com/tech/tsma/Thu, 14 May 2026 09:00:00 +0900https://www.parkjunwoo.com/tech/tsma/A CLI tool that indexes every function, detects test presence, measures coverage, and gives precise feedback to LLM agents. One command builds a regression defense line around legacy code.https://www.parkjunwoo.com/tech/toulmin/Sun, 22 Mar 2026 10:00:00 +0900https://www.parkjunwoo.com/tech/toulmin/Rule engines have treated their validation targets as facts for 60 years. toulmin treats them as claims. An implementation of Toulmin’s argumentation model as a Go rule engine.https://www.parkjunwoo.com/tech/filefunc/Mon, 16 Mar 2026 13:50:00 +0900https://www.parkjunwoo.com/tech/filefunc/The navigation unit for an AI code agent is the file. filefunc is a Go code structure convention and CLI tool that enforces one concept per file.https://www.parkjunwoo.com/tech/feature-chain/Fri, 13 Mar 2026 10:00:00 +0900https://www.parkjunwoo.com/tech/feature-chain/Which files do you need to touch to modify a single feature? Feature Chain takes one operationId and automatically extracts the entire scope — API spec, DB schema, authorization policy, state diagram, function implementations, test scenarios, and frontend.https://www.parkjunwoo.com/tech/whyso/Thu, 12 Mar 2026 10:00:00 +0900https://www.parkjunwoo.com/tech/whyso/git blame tells you who changed what and when. whyso tells you why. A tool that automatically extracts per-file change history from Claude Code session data.https://www.parkjunwoo.com/tech/space-sunshade-climate-control/Sun, 08 Mar 2026 09:00:00 +0900https://www.parkjunwoo.com/tech/space-sunshade-climate-control/Install a sunshade between the Sun and Earth to reverse the climate. Skip the coating on a Dyson mirror factory line and out comes a shade. No propellant needed — it flies itself. Remove it and everything goes back to normal. The math checks out.https://www.parkjunwoo.com/tech/ssac/Sat, 07 Mar 2026 09:00:00 +0900https://www.parkjunwoo.com/tech/ssac/A language-independent concept that decomposes business flows inside service functions into declarative blocks (sequences). Declare only what with 10 fixed types, and the codegen fills in how.https://www.parkjunwoo.com/tech/first-principles-ai-thinking/Thu, 26 Feb 2026 02:00:00 +0900https://www.parkjunwoo.com/tech/first-principles-ai-thinking/Don’t ask AI for answers. Use it as a sounding board to validate, dismantle, and rebuild your assumptions. A 5-step method with two real-world case studies.https://www.parkjunwoo.com/tech/waste-heat-recovery-heat-pump-cooker/Sun, 15 Feb 2026 00:30:00 +0900https://www.parkjunwoo.com/tech/waste-heat-recovery-heat-pump-cooker/High-temperature heat pump technology that dramatically reduces energy waste in conventional cooking appliances — how far has it come, and how can we make it better?https://www.parkjunwoo.com/tech/oasis-pellet-sand-dam/Sat, 14 Feb 2026 16:40:41 +0900https://www.parkjunwoo.com/tech/oasis-pellet-sand-dam/A proposal for Oasis Pellet technology: binding worthless desert sand with bio-adhesive to create water tanks that, at end of life, decompose into fertile soil.https://www.parkjunwoo.com/tech/iron-nickel-ess-rural-energy/Sat, 14 Feb 2026 15:39:09 +0900https://www.parkjunwoo.com/tech/iron-nickel-ess-rural-energy/Storing electricity wasted by solar curtailment in fire-free Edison batteries, then producing fertilizer and urea solution (DEF) from hydrogen — an energy-agriculture convergence model for self-sufficiency.