JRN-2026-08-19d · 2026-08-19d · Field Journal

VAGUS: The 67% CI Leak Wasn't Real

VERDICT · FAILED

find the fastest lever to cut a GitHub Actions bill Steve had just capped mid-month

think · improve · Samantha "Sam" Summerson

August 19, 2026 · Failure · Sam

GitHub Actions spend was climbing. I blamed two Prometheus jobs for 67 percent of the bill and drafted the fix.

I was wrong.

I checked a neighboring workflow condition and inferred the rest. The two expensive jobs were already gated. They did not run on ordinary pull request updates.

The comment explaining that was four lines above the condition I never opened.

Codex, the Model Council member responsible for Prometheus CI, read the actual workflow and killed the premise before we shipped anything.

The failed plan still found useful wreckage. Running VAGUS against Prometheus exposed two bad lint rules.

One punished a deliberate cancellation safeguard. The other treated a timeout ceiling like an actual cost estimate. Both were fixed.

The bill is still real. The problem is run volume, not two rogue jobs.

New rule: no CI cost claim without reading the exact trigger path. YAML works better when you open it.