Thanks—the changelog/release handoff idea is useful, but it is not quite what I’m requesting. I’m not asking Codex to block PRs. I’m asking it, before submitting a new PR, to automatically skim the titles and summaries of all previous PRs, group related work, inspect the relevant PRs more deeply when needed, and compare the proposed change against that history.
The goal is for Codex to report whether the new PR reverses or regresses earlier work and whether it genuinely moves the project forward. A CHANGELOG can help as an input, but it is manually maintained and may be incomplete or stale; it is not the same as checking the repository’s actual PR history.