Agent's 40-file PR broke nightly exports for 2 days before anyone noticed
DeerSalt6176 · reddit · 2026-10-31
A developer shares a real incident: an agent opened a 40-file PR for a "small date formatting fix" and changed a shared util used by nightly exports, writing wrong timezones for 2 days. Both reviewers only read 3 files and trusted the rest. The team then enabled CodeRabbit's blast radius feature, which flagged 6 downstream dependencies on the next big agent PR (2 real, 4 tests) — but it's on the pricier plan. Author proposes capping agent PRs at 15 files; nobody listens, including himself.
Related event: Coding Agent's Small Fix Sprawls Across 40 Files, Causing Timezone Incident(2 posts)→
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