How I find out whether a filter is filtering: ask it two questions that cannot share an answer
A tool that filters can fail in a way that is almost impossible to notice: it returns a plausible number of plausible results, and none of them were…
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The value of know-how in the age of AI
Recently, I struggled with a bug in one of my programs that did not work as expected. The issue made me feel frustrated because I had done everythin…
52 Days of Silent Zeros: The Stop Hook Payload Has No usage Field
I used to be a college student scraping by on ¥100k a month. Then I was laid off. Six months later, after building an autonomous Claude Code environ…
The 3% Drop That Only Showed Up on a Clean Server: A Debugging Retrospective
My forwarder lost 3% of its messages. My laptop reported zero. CI reported zero. Staging lost thousands every hour. I blamed the network. I blamed t…
My AI Refactor Was Slow. The Model Wasn't Guilty.
Everyone talks about what developers do while AI codes. Mostly, we wait. So I measured the waiting. The model was not guilty. For two weeks my workf…
Third-party APIs don't fail loudly — they return less
For several days, my service was quietly broken and every health check said it was fine. No exceptions. No 5xx. No alerts. The upstream API returned…
Four Java Bugs That Bad Indentation Hides in Plain Sight
javac does not care what your code looks like. Whitespace carries zero meaning in the Java Language Specification, so the compiler reads your file a…
The trailing newline that broke every webhook signature.
I spent an evening convinced GitHub was sending broken webhook signatures. It wasn't. echo was. The setup Chngd's GitHub Marketplace webhook verifie…
WordPress 7.1 deleted the check that kept classic editors un-iframed. Run this grep.
WordPress 7.1 took down a client's editor last week. Every custom ACF block moved its fields to the sidebar, and on one site they stopped saving wit…
How I Triaged 8,400 Production Errors Into 11 Real Bugs With Claude Code
TL;DR My error tracker had 8,400 events a week across ~340 distinct issues, and nobody on the team actually triaged them. I built a small pipeline t…
Docker Swarm Said “Insufficient Resources.” The Running Service Was Using 480 KiB
I expected this task to schedule. The running service was barely doing anything: MemoryUsage=480KiB / 5.772GiB MemoryPercent=0.01% CPU=0.00% Then I…
The CSP that killed our own form (a production-only Next.js bug)
A user wrote to us with the kind of bug report that makes your stomach drop: "The forgot-password form is not working at all." Not "it's slow." Not…
I spent two weeks building a content pipeline and then found I had no way to tell if it worked
Over two weeks I got a system doing all of this: writing articles, generating social cards, deploying to a CDN, verifying 41 redirects row by row, c…
cached_tokens is 0 because your system prompt isn't stable
I added a [cache] log line next to our usage tracker and read usage.prompt_tokens_details.cached_tokens off a warm conversation. It said 0 . Then 1…
My Car Had a Check Engine Light. My Code Has console.log().
Sometimes the Best Way to Find a Bug Is to Move It A few weeks ago, the check engine light came on in my 2007 SUV. I plugged in an OBD scanner and g…
The Fix That Passed Review and Crashed in Release
The fix passed review. It still crashed in release. The reviewer was never tested. The reviewer was me. And an AI model. We both approved the same w…
SSE Fragmented My JSON Into 30 Pieces. Here's the Parser That Put It Back Together.
I was building a streaming chat interface against MonkeyCode's free model access and its free server option, and the first few test runs went so smo…
.NET 10 BufferedStream WriteByte: Flush Full Buffers Explicitly
BufferedStream.WriteByte had a surprising side effect through .NET 9: the call at its internal capacity boundary also called Flush() on the wrapped…
Optimizing Keyboard Navigation in Complex Web Apps: Techniques and Debugging Tools
Ever found yourself tabbing through a complex web app only to get trapped inside a modal, or worse, see the focus jump erratically like it’s playing…
The Agent Crash-Looped on a Truncated Line: A Ledger Debugging Retrospective
The workflow had been running for six hours when the first alert fired. The apply stage was exiting with a JSONDecodeError, the supervisor was resta…
Unread badges that would not clear: 59 of my 64 messages were junk
I am building a small chat feature for an HR system. Shared hosting, PHP, no WebSocket, polling every few seconds. Nothing exotic. Then a bug report…
Debugging a Flaky LLM Pipeline: Timeouts, Truncation, and a 40-Line Probe
The failure had nothing to do with the free server, and everything to do with two assumptions I had baked into my harness. I moved a small LLM batch…
44 Thumbnails With the Wrong Hair Color: A One-Line Bug and the 300 Lines It Took to Pay It Back
Going from 100,000 yen a month as a college student to 1.2 million yen in monthly revenue didn't happen because the automation stack worked. It happ…
My tests could fail. They still could not tell me I was wrong.
A test proves your code does what you meant. It cannot prove that what you meant was correct. I could have written that sentence a year ago. I still…
My agent inflated its own state file to 49MB. Every check passed for three days.
I run an agent that wakes every four hours, does one thing, and writes its state back to STATUS.md . That file is its entire memory across sessions…
The Upload Succeeded, the Record Did Not
Originally published on hexisteme notes . I built a YouTube upload stage for a video pipeline, and the flow looked clean enough on paper: start a re…
52 Days, 2,340 Rows, Every Cost Logged as Zero: The Stop Hook Trap
Going from a $700/month student side hustle to a real business in six months came down to one thing: I stopped instructing Claude and started lettin…
.NET 10 NU1510 Package Pruning: Fix CI Without Breaking Legacy Targets
.NET 10 NU1510 package pruning can turn an SDK upgrade into a failed restore when a repository promotes warnings to errors. The tempting fix is to d…
You Found the ERROR. The Cause Is in the Lines Before It
A real incident investigation starts the moment you find the ERROR line. The ERROR is the result — the cause is usually upstream. The WARN just abov…
Your PrestaShop hook renders nothing, and nothing is logged
A module hook that returns an empty string looks exactly like a module hook that was never called. PrestaShop gives you nothing to tell them apart:…