Review Rationale

What Review Rationale Is

Review rationale is the explanation behind a code review decision, such as approval, rejection, or a requested change. It captures the reasoning that helps future reviewers, authors, and automated systems interpret the same code consistently.

Why Review Rationale Matters

Good rationale turns a review comment from a one-off opinion into durable engineering context. It helps explain whether the issue is about correctness, security, maintainability, performance, or architecture, and it reduces ambiguity when a similar change appears later.

That matters because review history often becomes part of the decision record for a repository. If the rationale is too vague, teams may repeat the same debate, miss a latent risk, or accept a workaround without understanding the trade-off that justified it.

What Makes Strong Review Rationale

Strong rationale is specific enough to be useful later, but not so verbose that it becomes a second design document. It usually names the condition that triggered the decision, the impact of keeping or changing the code, and the standard or expectation the reviewer applied.

• State the reason, not just the verdict.
• Connect the comment to the affected behavior, dependency, or control.
• Distinguish required changes from preference-driven suggestions.
• Keep the explanation readable for both humans and agentic workflows that may summarize or reopen the review later.

How Review Rationale Supports Future Change

Review rationale creates continuity across commits, pull requests, and handoffs. When later changes touch the same area, the earlier rationale helps explain why a pattern was accepted, why a safeguard was added, or why an implementation was rejected for now.

It is especially valuable when the codebase includes recurring exceptions, compensating controls, or temporary trade-offs. In those cases, the rationale is often the only place where the engineering judgment is preserved in a form that survives beyond the original conversation.

Related resources from NHI Mgmt Group

• Review cadence rationale gap
• Machine-Readable Review Rationale
• When should organizations review their NHI policies?
• When should organizations review access controls?