91% pass rate. Gate green. Shipped. Worst regression we had all quarter.

<h1> My Exit Rule Said '2 Periods' — My Code Was Counting Something Else Entirely </h1> <p>My funding-rate bot has an exit rule that reads like plain English:<br /> </p> <div

<p><em>What running a fleet of autonomous trading bots taught me about picking the right metric.</em></p> <p>I run a small fleet of automated trading bots in paper mode. One of

<p>Our eval dashboard said 94%. Green checkmark, merge button unlocked, everyone moved on. Three days later a customer forwarded us a transcript where our support agent had pasted

<p>A code deploy either works or throws. A model deploy usually does neither: the new version returns 200s at the same latency and is slightly worse at the thing you care about.

<p>A patch touches zero test files. No assertion changes, no new skips, no fixture edits. The suite goes green on the first run.</p> <p>Then someone opens the job duration graph

<p>A teammate deleted a test file on a Friday. Not on purpose. The suite still passed. The pipeline still went green. Nobody noticed for three weeks.</p> <p>Here's the part that

<p>The <a href="https://dev.to/smukker/lesson-4-validation-a-must-have-cornerstone-3bd2">last lesson</a> was about validating what a model hands you. The story behind it: a set of

<p>I ran ten reweightings of a quality gate on my own scoring pipeline this week, and the output pool never moved. Same 208 posts out of 399 survived hard excludes, every single