GitHub CODEOWNERS and review ownership

What you will learn

• Understand the core purpose of GitHub CODEOWNERS and review ownership
• Master the basic usage and common options of GitHub CODEOWNERS and review ownership
• Use CODEOWNERS to route pull-request review to responsible maintainers and reduce ownership gaps on critical code paths.
• Understand key concepts: Design guidelines
• Know when to use this feature and when to avoid it

CODEOWNERS is an ownership-routing mechanism, not just an extra review formality.

Start with a problem

You're already using GitHub or GitLab to host code, but beyond push and pull, you're not fully familiar with the collaboration features these platforms offer — PR workflows, code review, and permission management.

Design guidelines

1. map owners to module boundaries, not temporary assignments
2. avoid single-owner critical paths
3. maintain ownership map as team topology changes

File Paths

src/docs/config/

CODEOWNERS

@team-backend@team-docs@team-devops

Review Requirements

Mandatory approvalAuto assignmentClear ownership

With branch protection

When “require review from code owners” is enabled, PRs touching owned paths cannot merge without owner review.

!Overly granular rules can create review bottlenecks

Too many narrow ownership patterns can request unnecessary reviewers and slow throughput.

Good follow-up reads

1. code review handoff quality
2. small batch review
3. github pull requests and reviews

Try it yourself

1. Practice the github-codeowners-and-review-ownership command in a test repository and observe state changes before and after
2. Experiment with different options and compare the output differences
3. Simulate a real scenario where you would need to use this, and walk through the full process