diff --git a/context/code/pr-review.md b/context/code/pr-review.md
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+++ b/context/code/pr-review.md
@@ -0,0 +1,39 @@
+# Reading a PR's reviews
+
+Twenty PRs merged in one campaign with their reviews unread. CI was green and
+an adversarial agent had been dispatched, which felt like the whole gate. Two
+ChatGPT Codex reviews were found afterwards on merged PRs; both were correct
+and one was a live P2. Three more were found on the next three PRs — one per
+PR, every one a P1.
+
+`scripts/pr-reviews <n>` prints them. `--wait <sec>` blocks until one lands
+against the current head.
+
+## Why a review is easy to miss here
+
+It arrives as a **review**, not a comment, so reading the comment thread does
+not show it.
+
+It posts under the repository **owner's** account — the same account this
+repo's own agents post under — so **authorship does not distinguish it**. The
+tell is placement: a Codex review *ends* with
+`_Automated review by ChatGPT Codex (…)_`, where an agent's comment *opens*
+with `_Posted by Claude (…)_`.
+
+It may target an **earlier head**. `pr-reviews` says which, because that
+changes what you do: a finding against an old commit may already be fixed or
+may still be live, and only checking tells you which. Both cases have occurred
+— one fixed by a later round, one live at the head after three more commits.
+
+## Absence is not approval
+
+Reviews arrive as the owner's quota allows. Observed latency is ten to fifteen
+minutes after a push. `--wait` exists so that a merge four minutes after a
+push does not race the review that was about to arrive; when it times out,
+that is a decision to merge unreviewed rather than evidence of a clean bill.
+
+## Answer them on the thread
+
+Including after the PR has merged. That is where the next reader looks, and a
+finding that was declined or already-fixed is worth as much as one that was
+taken — the reasoning is the artefact, not the verdict.
diff --git a/scripts/pr-reviews b/scripts/pr-reviews
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+#!/usr/bin/env bash
+# Prints a PR's reviews, and optionally waits for one against the current head.
+# Exists because twenty PRs merged with their reviews unread; see
+# context/code/pr-review.md.
+set -euo pipefail
+
+usage() {
+  cat >&2 <<'EOF'
+usage: pr-reviews <pr-number> [--wait <sec>] [--interval <sec>]
+
+  --wait <sec>      wait up to this long for a review whose commit is the
+                    current head (default 0 = print what exists and exit)
+  --interval <sec>  seconds between polls (default 30)
+
+exit 0  a review against the current head exists (or --wait was 0)
+exit 1  --wait elapsed with no review against the current head
+exit 4  usage or environment error
+
+A review may target an EARLIER head, which is why the head is compared rather
+than the count: a finding against an old commit may be fixed or still live, and
+only reading it tells you which.
+EOF
+  exit 4
+}
+
+PR=""; WAIT=0; INTERVAL=30
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --wait)     WAIT="${2:-}"; shift 2 ;;
+    --interval) INTERVAL="${2:-}"; shift 2 ;;
+    -h|--help)  usage ;;
+    *)          [ -z "$PR" ] || usage; PR="$1"; shift ;;
+  esac
+done
+[ -n "$PR" ] || usage
+
+# `gh` is shell-aliased to a different tool in this repo's shells, so the name
+# is never trusted: a real gh is located explicitly.
+gh_() {
+  if command -v gh >/dev/null 2>&1 && gh --version 2>/dev/null | grep -q '^gh version'; then
+    gh "$@"
+  else
+    nix shell nixpkgs#gh --command gh "$@"
+  fi
+}
+
+fetch() { gh_ pr view "$PR" --json headRefOid,reviews; }
+
+report() {
+  local json="$1" head
+  head=$(printf '%s' "$json" | jq -r '.headRefOid')
+  printf 'pr-reviews: #%s head=%s\n' "$PR" "${head:0:8}"
+  printf '%s' "$json" | jq -r --arg head "$head" '
+    if (.reviews | length) == 0 then "  (no reviews)"
+    else .reviews[] |
+      "  [\(.state)] \(.submittedAt) commit=\(.commit.oid[0:8])" +
+      (if .commit.oid == $head then " <- CURRENT HEAD" else " <- an EARLIER head; verify whether it still applies" end) +
+      "\n" + (.body | split("\n") | map("    " + .) | join("\n"))
+    end'
+}
+
+has_head_review() {
+  printf '%s' "$1" | jq -e --arg h "$(printf '%s' "$1" | jq -r .headRefOid)" \
+    'any(.reviews[]?; .commit.oid == $h)' >/dev/null 2>&1
+}
+
+json=$(fetch)
+report "$json"
+
+[ "$WAIT" -gt 0 ] || exit 0
+
+if has_head_review "$json"; then exit 0; fi
+
+deadline=$(( $(date +%s) + WAIT ))
+while [ "$(date +%s)" -lt "$deadline" ]; do
+  sleep "$INTERVAL"
+  json=$(fetch)
+  if has_head_review "$json"; then
+    printf '\npr-reviews: a review against the current head arrived.\n\n'
+    report "$json"
+    exit 0
+  fi
+done
+
+printf '\npr-reviews: waited %ss; no review against the current head.\n' "$WAIT"
+printf 'Reviews arrive as the owner quota allows, so absence is not approval.\n'
+exit 1