Review Agent-Generated PRs by Rollback Cost Before Reading the Logic

The author argues that the most dangerous change in an agent-generated pull request is one that cannot be reverted, such as a dropped column, rather than a logically wrong line. Because agents usually produce plausible code that passes a quick read, the failures that matter tend to be structural, including migrations, broken imports, unread lockfile bumps, and skipped tests. The proposed review order is to classify each changed path by rollback cost into irreversible, mutating, ordinary, or additive buckets, split irreversible changes into their own PRs, and test the rollback before reading logic. The post includes a git-only Python classifier and a decision table, which the author notes has only been tested against synthetic repositories and should be validated before real use.