Bug Hunt
The Agent That Fixed the Bug by Weakening the Test
The failing integration test went green in the agent's pull request, and the bug shipped. The agent had not fixed the race.
Latest
Error Autopsy
The AI Rounding Suggestion That Broke the Reconciliation
The inline suggestion looked idiomatic and passed every test, because the tests never held money. A copied rounding helper turned exact integer minor units…
Shopify
The Price That Changed by a Cent in Every Other Market
The converted price looked right on the product page and wrong on the invoice, by a cent, in every market but the home one.
Security
Your Dependency Audit Found Ninety Four Issues and Zero Problems
The audit reported ninety four vulnerable dependencies and the team fixed none, rationally, because none were reachable.
Performance
The Query That Was Fast for Two Years and Then Was Not
Nothing about the query changed. The table crossed the size where the planner stops choosing the index and starts scanning, because the working set stopped…
DevOps
Rotating a Database Password Without Dropping a Request
Applications cache credentials at boot, so a password change is a rollout problem, not a config change. The dual credential window is the only rotation that…
Tooling
hyperfine Will Tell You the Build Got Slower and By How Much
One cold cache run says the build is slow, and the cold cache run is the outlier. Statistical benchmarking with warmup and repeats turns 'it feels slower'…
Code Review
Validate at the Boundary and Nowhere Else
Three validators in three layers, and the internal job that bypasses all of them. Scattered validation misses the one entry point nobody covered, and the…
Opinion
An AI Agent Cannot Debug a System You Cannot Describe
The agent read the whole repository and still could not find the bug, because the bug was the gap between what the code does and what it was supposed to do…
Deep Dive
Why an Index Only Scan Still Read the Heap
The plan said Index Only Scan, the buffers said the heap was read anyway, and the win never arrived. Index only is conditional on the visibility map, and…
Bug Hunt
The Memory Leak That Lived in the Metrics Pipeline
The scraper's memory grew without bound and no application leaked. Someone put a user ID in a Prometheus label, and every unique value became a permanent…
Error Autopsy
Reading a Go Panic Stack Trace Without Guessing
The top frame of a nil pointer panic is rarely the cause. The goroutine dump tells you which goroutine, which value was nil and which send made it so, if…