You finished the feature, tests passed, PR's up. There is one function that is doing too much. That conditional could be tighter and there's a duplicate block that's begging to be a helper.
The thing is, it's 5pm. You've got standup notes to write and two PRs to review. The cleanup gets a TODO and a quiet promise to come back to it.
You know how that ends. Always.
Meet Simplify Code
Simplify Code reviews the files you changed in a PR and applies targeted improvements - extracting reusable functions, simplifying conditionals, removing redundant code and so on, without changing behavior. One comment and the cleanup pass actually happens.
How it works
You can either comment @coderabbitai simplify in the pull request thread or check the Simplify code box in the CodeRabbit walkthrough comment.
What happens when you trigger it
Here's what that looks like:
- Sandbox clone: CodeRabbit clones your repo into a sandbox and diffs the PR branch against the base to identify every changed file.
- Targeted edits: an AI agent reads each changed file and applies focused improvements: extracting helpers, collapsing redundant logic, tightening conditionals (behavior stays the same)
- Verification: the agent runs your existing test suite to confirm nothing broke.
- Delivery: open a new PR with the simplified code or commit it directly to your existing branch.
The whole process can take up to 20 minutes depending on PR size.
What Simplify Code won't touch
While it stays in the cleanup lane, it won't:
- Change public APIs or rename exported symbols
- Alter test assertions
- Refactor code outside the files changed in your PR
If your test suite fails after the changes, it still delivers them so you can inspect, fix or discard.
Try it out
CodeRabbit’s Simplify Code feature is available on the Pro+ plan, on GitHub.
Next time you ship a PR and feel the itch to come back and clean it up, don't bookmark it. Drop a comment.
