AI Can Speed Up Code Review — but Merge Decisions Still Need Deterministic Guardrails

AI Can Speed Up Code Review — but Merge Decisions Still Need Deterministic Guardrails AI is already useful in pull request workflows. It can: summarize diffs explain code changes suggest fixes identify risky files draft reviewer context reduce reviewer fatigue That is real value. But there is a line teams should be careful not to cross: AI can accelerate review. It should not be the final authority on merge. TL;DR Use AI to help people review code faster. Do not let a probabilistic system be the thing that ultimately decides whether a pull request is allowed to merge. That final decision should come from deterministic policy. Why this matters Code review and merge governance are related, but they are not the same problem. Review is exploratory. Merge is enforcement. At merge time, the system is no longer asking, “What might be risky here?” It is asking: Did the right people approve? Did the required checks pass? Does this change affect sensitive paths? Does it meet branch-specific rule