Notebook Entry 006
Stacked Deploys Make All Three Features Fail — Can't Isolate Cause
April 6, 2026
Why did three shipped features fail together, and which one caused it?
What happened
The app platform shipped UTM tracking, free trial implementation, landing page refresh, and recovery emails simultaneously. All three measurable features failed. Because they shipped together, there was no way to isolate which change broke what.
Root cause
No deployment discipline. When multiple changes ship at once, debugging becomes a combinatorial problem instead of a simple binary.
What changed
Deployment rule established — one ship → one verify → one confirm. No stacking. Saved in the platform tech notes.
The lesson
This is the same principle as scientific method: change one variable at a time. AI tools make it easy to ship fast, which makes it tempting to ship everything at once. The speed is an asset only if you can tell what worked.
One implementation insight every other Tuesday.
What actually works when you ship AI in real organizations. Nothing you could get from a press release.