Multi-file AI edits, in 30 seconds: agents will happily change twelve files on one prompt, so the rule is simple, the wider the edit, the narrower the task.
Why this matters
A vague prompt plus a capable agent equals a confident change that quietly rewires behavior across the codebase, and the wider the blast radius, the harder the review, which is exactly when teams start skimming PR summaries instead of reading diffs.
The common mistake
The PR summary is the agent grading its own homework. The diff is the homework, and only one of them belongs in a review.
How we approach it
The 30-second discipline: tests exist before the agent runs, they're the guardrail, not the afterthought. Tasks stay small and scoped, 'add pagination to the orders endpoint,' never 'clean up the backend.' Diffs get reviewed file by file, because the summary is the agent's opinion of its own work. And a human signs every merge, no exceptions for green checks.
A checklist you can use
Agents change twelve files per prompt — so narrow the task
Vague prompt + capable agent = confident rewiring
Tests before the run; they're the guardrail
Review the diff file by file, never the summary
A human signs every merge
When to bring in help
Rewrite your next agent prompt until it names one outcome in one place. If the prompt needs the word 'everything,' it isn't ready to run. If the honest answer is that nobody on the team owns this end to end, that's the moment to borrow the depth rather than improvise it.
Takeaway
Blast radius scales with ambition; safety scales with scope discipline. Keep the tasks narrow and multi-file edits become your fastest safe lane.
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