Stage – AI Code Review That Organizes PRs Like Chapters
Stage uses AI to break pull requests into logical chapters, so reviewers understand changes faster instead of staring at a giant unorganized diff.
TL;DR
TL;DR: Stage is a code review tool that uses AI to organize pull request changes into logical chapters, guiding reviewers step-by-step through a PR instead of throwing a massive diff at them all at once.
Source and Accuracy Notes
- Product: https://stagereview.app
- HN Discussion: Show HN: Stage – Putting humans back in control of code review (130 points)
- Demo: https://stagereview.app/explore (example PRs you can try without installing)
What Is Stage?
As AI coding assistants became mainstream, something unexpected happened to engineering teams: PR backlogs exploded. AI writes code fast, but that means more changes land in each pull request, and those PRs are harder to review because the changes touch more files across more layers of the stack simultaneously.
Stage was built to solve this specific problem. Instead of presenting a pull request as one big chronological diff, Stage analyzes the changes and groups them into logical chapters — small, self-contained sections that each cover one aspect of the change. A reviewer can read through the chapters in order and build a mental model of what the PR does before diving into individual line comments.
The pitch is straightforward: code review should feel like reading a well-organized book, not scanning a pile of shuffled pages.
Setup Workflow
Step 1: Install the GitHub App
Stage operates as a GitHub App. To get started:
- Go to https://stagereview.app and click Install GitHub App
- Authorize the app on your GitHub account or organization
- Select which repositories Stage should have access to — you can restrict it to specific repos or grant access org-wide
- Once installed, Stage automatically appears on pull requests for those repositories
The GitHub App needs read access to your code and PR metadata. It does not need write access to your code.
Step 2: Open a Pull Request
When you open a PR in a connected repository, Stage automatically processes it in the background. Within a few seconds, the PR gets a Stage thread that shows the chapters it has identified. You do not need to trigger Stage manually — it reacts to PR events via GitHub webhooks.
Step 3: Review by Chapter
In the Stage interface, each chapter shows:
- A descriptive title (e.g., “Update user authentication middleware”, “Add error handling for API fallback”)
- The list of files and changes that belong to that chapter
- A summary of what that section of the PR does
You can read chapters sequentially to understand the PR’s intent before looking at individual lines of code. You can also collapse chapters that are not relevant to your review focus.
Step 4: Comment and Approve
Stage is a review overlay on top of GitHub. You still use GitHub’s native UI to leave comments, request changes, or approve — Stage does not replace GitHub’s review workflow, it reorganizes it.
Slack notifications can be configured so your team gets alerted when a PR is ready for review and when chapters are ready to read.
Deeper Analysis
Why Chapters Beat Chronological Diffs
Traditional PR diffs show changes in the order files were modified — which is an artifact of how a developer worked, not how the change should be understood. A PR that touches the API layer, the database schema, the frontend component, and the test files all at once will show all four groups of changes jumbled together.
Stage uses AI to group changes by their logical purpose. A refactor that touches twelve files might be organized into three chapters: “Extract payment processing logic,” “Update database migrations,” and “Update unit tests for payment module.” Each chapter is self-contained and understandable on its own.
This matters especially for:
- Large refactors that touch many files at once
- AI-generated PRs which tend to be broad and touch unexpected parts of the codebase
- Security-sensitive changes where reviewers need to understand the full scope before approving
Explore Section Without Installing
If you want to feel the product before committing to an install, Stage hosts an explore section at https://stagereview.app/explore. You can browse real (anonymized or example) PRs that have already been processed through Stage and see how chapters are structured. This is a useful way to validate whether the chapter organization actually helps before connecting your own repositories.
What Stage Does Not Do
Stage is not a linter, a CI gate, or an automated code quality checker. It does not run tests, flag style violations, or enforce merge rules. It organizes information for human reviewers. The actual approval and merging still happens in GitHub’s standard review flow.
Stage also does not currently support GitLab or Bitbucket — it is GitHub-only.
Practical Evaluation Checklist
- Is your team spending more time than expected reviewing large AI-generated PRs?
- Do reviewers frequently miss related changes because they are spread across unrelated files?
- Is your team comfortable with a GitHub App having read access to your code?
- Do you want reviewers to understand the intent of a change before reading the implementation?
- Does your team use GitHub for code hosting (Stage does not support GitLab or Bitbucket)?
If you answered yes to most of these, Stage is worth trying. The GitHub App install takes under five minutes and works on public and private repositories.
Security Notes
Stage operates as a GitHub App with read access to repository contents and pull request metadata. The company behind Stage is transparent that it processes PR data on its own servers to generate chapter organization. As with any GitHub App, review the permissions before installing on organization repositories, especially for private or security-sensitive codebases.
FAQ
Q: Does Stage work with private repositories? A: Yes. Stage can be installed on private repositories and organization accounts, not just public repos.
Q: Does Stage replace GitHub’s review workflow? A: No. Stage is a review organization layer that sits on top of GitHub. You still approve, request changes, and merge through GitHub’s native interface.
Q: Does Stage support GitLab or Bitbucket? A: Currently Stage only supports GitHub. GitLab and Bitbucket integrations are not available yet.
Q: How does Stage determine chapter groupings? A: Stage uses AI to analyze the changes in a PR and identify logical groupings based on what the changes actually do — grouping by feature, refactor type, or concern area rather than by file modification order.
Q: Can I preview Stage before installing it? A: Yes. The explore section at stagereview.app/explore contains sample PRs that have been processed through Stage. You can see the chapter structure without connecting any repositories.
Conclusion
Stage tackles a specific, concrete problem that has gotten worse as AI coding tools have gotten better: review backlogs, larger PRs, and reviewers who do not have time to build a full mental model before approving. The chapter-based approach is a simple idea that makes a real difference in how quickly a reviewer can understand a complex change.
The install is frictionless, the explore section lets you try before you buy, and because it is a GitHub App rather than a proxy or fork, it does not change how your team merges code. If your team regularly deals with large or AI-assisted pull requests, Stage is a tool worth having in the review workflow.