Insights

Deep dives into automation, AI technology, and business strategy.

개발 운영2026-10-02

A Month of Rewriting a Zero-Traffic Blog for AI Readers

AI agents are starting to do our purposeful searching for us. What a solo blog with zero clicks in 16 months tried over one month — and what the numbers say afterward.

개발 운영2026-09-30

Wiring Up Sonnet 5.5 Computer Use — Five Toolset Walls, 540K Input Tokens per Run, and 'Two Eyes'

Five schema walls in the new computer-use toolset, 540K input vs 3K output tokens with screenshots, text vs screenshot 'eyes', and a 5-vs-5 Opus 5.5 / Sonnet 5.5 A/B — measured, not benchmarked.

개발 운영2026-09-14

Google's Ad Tech Wasn't Broken Up — What Actually Changes for a Solo Blog

On September 2, 2026, structural divestiture was rejected. For a solo blog nothing changes — for two reasons that lie outside the ruling itself.

개발 운영2026-09-14

AdSense Changes How It Counts Impressions — And This Time There's No 'Earnings Won't Be Affected'

From February 17, 2027, impressions are counted at begin-to-render instead of count-on-download. What Google's notice says, and what it pointedly does not.

개발 운영2026-07-24

My AI Assistant Started Losing Track of Time: The Session-Cache That Swallowed 'Now'

A resume optimization omitting the whole system prompt froze the current time that should refresh every turn - fixed by a dedicated channel for time-varying data

개발 운영2026-07-24

grep Lied to Me in Silence: How One Control-Byte Hid an Entire File

When grep returns nothing - how a replacement tool's binary auto-skip plus one control byte hid a file from search

개발 운영2026-07-24

Google's Review Bots Ate My Remote Commands: A Lesson in Device Scoping

Silent loss of remote commands in an internal-test app - review bots are users too, and broadcast defaults are dangerous

개발 운영2026-07-24

I Retired a Strategy That Passed Its Backtest: Multiple Comparisons and Fake Winners

2 of 12 grid cells passed in-sample, then collapsed out-of-sample - the multiple comparisons illusion and a retirement decision

개발 운영2026-07-24

My Expense Tracker Invented $4,000 of Phantom Spending: SMS Parser False Positives

Dissecting four false-positive species in an SMS expense tracker and fixing them with server-side rules

개발 운영2026-07-24

The Dead Service That Stayed "Online" for a Year: A DB-Driven App Launcher

Postmortem of replacing a hardcoded app dashboard with a DB-driven launcher — measured liveness, one-line registration

개발 운영2026-07-17

A Service That Restarted 480,000 Times While Dead: Reviving a Ghost systemd Unit

개발 운영2026-07-17