What is a pull request preview?
A pull request preview is a live, temporary URL where a proposed change runs before it is merged. Instead of reading a diff or trusting a screenshot, a reviewer opens the link and uses the changed app directly.
Why it matters for AI-built apps
When an AI assistant writes the change, the person steering often does not read the code. A preview shifts the review to the only place they can actually judge: the running app. On White Ghost every open pull request gets its preview URL automatically, updated on each push, and the URL expires when the pull request closes.
What a preview is not
A preview is not a second production environment. On White Ghost it runs against the app’s development database rather than production data, and the URL is public: anyone with the link can open it, so it is shared deliberately. Production only changes when the merge lands and the normal build ships it.