GitHub details Evergreen, an internal app for automating outside-collaborator reviews and stale repo archival

GitHub built Evergreen, a GitHub App, to automate repo hygiene in a shared organization where employees collaborate with customers and partners. It runs quarterly outside-collaborator access reviews and stale-repo checks using native GitHub features such as scheduled Actions, issues, webhooks, custom properties, and git-tracked JSON state. Its defaults are fail secure—unanswered reviews lead to revoked collaborator access—and archival is reversible rather than destructive.

For teams managing many shared repos, Evergreen’s use of issues plus git-tracked state offers an auditable workflow without a separate database. The trade-off is that fail-secure automation can disrupt collaborators if ownership signals or notifications are wrong, so dry runs, clear deadlines, and opt-out properties become operational requirements; the article does not report rollout results or error rates.