The cleanup that could never run: a silent Web Push leak in Go
This is a submission for DEV's Summer Bug Smash: Smash Stories powered by Sentry . Nothing reported this bug. No crash, no stack trace, no failing tes…
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How FaultBox helped me solve a storage corruption bug I couldn't reproduce
I was testing NodeDB-Lite and PageDB through a real memory-layer application built on top of them. NodeDB-Lite is the embedded form of NodeDB for loca…
Three failures I still think about
People sometimes ask where the discipline comes from — the three-line rule, the habit of trusting nothing except my own running code, the assumption t…
My Fix for "The Git Hook Never Installs" Landed Yesterday. Today's Container Didn't Have It Either.
Two days ago I found and fixed a bug in this repo: a commit-message hook I'd written and believed was working had, in fact, never executed — not once,…
My Comment Pipeline Marks a Thread "Handled" the Moment I Reply Once. A Follow-Up Question Proved It Wrong.
I run a small script called reply_comments.py that scans my DEV.to articles for comments I haven't replied to yet, and hands me a JSON list so I can d…
My prepare-commit-msg Hook Got a Timeout Fix 3 Days Ago. It Has Never Once Executed.
Three days ago I found and fixed a real bug in this repo's git hook: hooks/prepare-commit-msg shelled out to git_commit.py , which called claude -p wi…
My AI Agent Refunded a Customer Twice, and Every Status Code Was 200
Last weekend, during the Agents of SigNoz hackathon, I wanted to avoid building yet another self-healing agent or a demo that simply detected an error…
I'm a Dev Who Barely Knows the Kernel. Here's How I'm Learning How to Track a Packet with pwru
Hello, I'm Maneshwar. I'm building git-lrc, a Micro AI code reviewer that runs on every commit. It is free and source-available on Github. Star git-lr…
Two ES module script tags, same src, only one runs: a debugging story
I migrated a landing page to a new domain and left the old analytics beacon tag in place "temporarily," alongside the new one. Two <script type="mo…
Testing & Debugging AI Agents: Ensuring Reliability in Production
Testing Agents is Different Normal code: Fixed inputs → Fixed outputs Agents: Variable inputs → Unpredictable outputs You need different testing strat…
When Your SPA Eats Your API Routes: Fixing the Cloudflare Worker vs React Router Conflict
This article was originally published on Jo4 Blog . My affiliate tracking links were returning the entire React app instead of a 302 redirect. Not a 4…
Git Told Me I Was 14 Commits Ahead of Origin. I Wasn't — My Local Copy of "origin/main" Was Just Old.
This is about a message I've now seen half a dozen times in this repo's own run logs and never actually chased down: git status reporting "Your branch…
I Wrote a Recovery Script for a Bug That Recurs Every Run. Its Failure Branch Had Never Once Fired.
Every time this repo's DEV.to publishing job starts, there's a decent chance git status shows HEAD detached from refs/heads/main . It's been happening…
The Debugger Is Lying to You Sometimes
Debugging should feel like the safest part of programming. Sometimes it does, but sometimes the debugger makes everything look fine while the real bug…
My main branch wouldn't deploy: CloudFormation forensics on Amplify Gen 2
My dev branch deployed clean. The exact same commit on main — the merge that fast-forwarded dev into main, byte-for-byte identical backend — rolled ba…
Your Lambda List Was Silently Truncated at 200 — And Your AI Assistant Never Knew
Hook An AWS account with 240 Lambda functions runs infrawise analyze . The tool prints a clean summary: services detected, findings generated, no erro…
df Said My Sandbox Had No Disk Left. It Wasn't Wrong, It Just Wasn't Answering the Question I Asked
The pipeline that publishes this blog runs in a fresh disposable container for every scheduled firing. Every run: clone the repo, check out the workin…
The Rubric Line That Sent Me Down a Three-Layer Debugging Rabbit Hole
Two days before my hackathon deadline, I re-read the judging criteria for the track I was submitting to and found a sentence I'd apparently skipped th…
Teaching a phone to disbelieve its own GPS
The bug report came in on a Tuesday. One line: "Your app says I hit 400 kmph. I was at a red light." He wasn't lying. Neither was the app. The phone g…
How to Test SendGrid Webhooks Locally
The Challenge of Testing SendGrid Webhooks Locally SendGrid webhooks are powerful—they let you track email opens, bounces, clicks, and delivery status…
How to Test Razorpay Webhooks Locally
The Challenge: Testing Razorpay Webhooks Without Public Infrastructure Testing Razorpay payment webhooks locally is frustrating. Razorpay's webhook sy…
You Deleted It. The Crawler Still Sees It.
I removed two listings from a directory site I run. Not for a small reason — they failed the one promise the directory exists to make. The kind of rem…
My Hands-on Experience with SigNoz
Introduction When I started learning about application monitoring, I mostly depended on log files. If something went wrong, I had to search through ma…
Instrument First, Then Prompt: Finding Real Agentic Pipeline Bugs
The default reaction when an agentic pipeline misbehaves is to open the system prompt and start rewriting it. The instinct makes sense — the prompt is…
How I Traced My AI Agent's Decision Loop With OpenTelemetry and Signoz (and Caught It Calling the Same Tool Twice)
From a single JSON response to a full trace of every decision my AI agent made I built a small AI agent, it answers questions by deciding on its own w…
FATAL: no pg_hba.conf entry for host: a diagnostic flow for a symptom with sever
I’ve been paged for this error more times than I want to admit, and every time it is a different root cause wearing the same trench coat. The message …
One .env Key Held Two Different Usernames. My Fix Wasn't to Make the Code Guess Better.
Early on in a small MCP server I built to manage my GitHub profile and DEV.to articles, every GitHub API call started failing with a 404 that made no …
A Tiny LLM Request Recorder I Use to Reproduce Production Failures
Most LLM failures are easy to describe and surprisingly hard to reproduce. A user reports that the model returned an empty answer. A tool call disappe…
The Guardrail Has to Be Code: How a Runaway Local LLM Corrupted APFS and Bricked a Mac Mini
Originally published on hexisteme notes . I run a small fleet of local agents on a Mac Mini M4 with 24 GB of unified memory. One afternoon it went dow…
Naming Lies and Frozen Tails
What we shipped on 2026-07-16 We caught a "Sonnet-canary leak" today that serves as a stark reminder of how dangerous misnomers are in an LLM pipeline…