CODEOWNERS

CODEOWNERS is a plain-text file, usually kept at .github/CODEOWNERS, that maps file paths and glob patterns in a repository to the individuals or teams responsible for them. When a pull request changes matching files, GitHub and GitLab automatically request review from the listed owners, turning a governance intention into an enforced step in the workflow. It is the smallest, most direct way to encode “who must sign off on changes here” into the repository itself.

• Path-to-owner mapping - Glob patterns bind directories, file types, or specific files to named users or teams.
• Automatic review requests - Matching pull requests pull in the right reviewers without anyone having to remember to add them.
• Branch protection integration - Combined with required-review rules, ownership can be made a hard merge gate rather than a suggestion.
• Last-match-wins precedence - Ordering matters, so more specific rules placed later override broader ones above them.

In real operations, CODEOWNERS is where API governance stops being a document and becomes a control — the OpenAPI specs, schemas, and policy files in a repository can be assigned to an API platform or governance team so no change to a contract merges without their eyes on it. I treat it as a companion to the other repository health files like the license and CODE_OF_CONDUCT.md, and it maps cleanly onto the APIs.json-powered operational governance I keep exploring, where GitHub repository properties, rules, and ownership together enforce how APIs are produced. For any team governing APIs at scale, a well-maintained CODEOWNERS file is one of the most reliable, machine-checkable signals that accountability for the contract is actually assigned.