40-file agent PR broke nightly exports for 2 days; team adds blast-radius checks
Fickle_Excitement729 · reddit · 2026-10-31
A Reddit user recounts how a coding agent turned a 'small date formatting fix' into a 40-file PR that changed a shared util and corrupted timezone handling in nightly exports for two days before anyone noticed. Both reviewers had only inspected 3 key files. The team now uses CodeRabbit's blast-radius feature, which flagged 6 downstream dependencies (2 real) on the next big agent PR, though it's locked behind the higher pricing tier. Still no enforced rule on agent PR size; the author suggests a 15-file cap nobody follows.
Related event: Coding Agent's Small Fix Sprawls Across 40 Files, Causing Timezone Incident(2 posts)→
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