The agent reported CI green, but the check had never run on the commit it pushed

An agent amends or force-pushes a fix, then polls the CI check it already knows about, sees a green conclusion from the previous commit, and reports the PR ready. That verdict belongs to the older SHA; the new commit has not run a check yet. This article covers why polling the named check rather than the pushed commit returns a stale green, the telltale signs, and the gate of requiring the check run's SHA to match HEAD before calling the PR clear.