diff --git a/.github/workflows/release-pr.yml b/.github/workflows/release-pr.yml
index 9887966..42ba0dc 100644
--- a/.github/workflows/release-pr.yml
+++ b/.github/workflows/release-pr.yml
@@ -71,8 +71,18 @@ jobs:
             exit 0
           fi
 
-          pr_number="$(jq -er '.number' <<<"${RELEASE_PR}")"
-          branch="$(jq -er '.head_branch' <<<"${RELEASE_PR}")"
+          pr_count="$(jq -er '.prs | length' <<<"${RELEASE_PR}")"
+          if [ "${pr_count}" -eq 0 ]; then
+            echo "No Rust release changes to prepare"
+            exit 0
+          fi
+          if [ "${pr_count}" -ne 1 ]; then
+            echo "::error::Expected one version-grouped Release PR, got ${pr_count}"
+            exit 2
+          fi
+
+          pr_number="$(jq -er '.prs[0].number' <<<"${RELEASE_PR}")"
+          branch="$(jq -er '.prs[0].head_branch' <<<"${RELEASE_PR}")"
           gh pr checkout "${pr_number}" --force
 
           python3 tools/sync_release_docs.py
diff --git a/tools/check_ci_contracts.py b/tools/check_ci_contracts.py
index 1b8057f..ab894cf 100644
--- a/tools/check_ci_contracts.py
+++ b/tools/check_ci_contracts.py
@@ -215,6 +215,10 @@ def main() -> int:
         "--manifest-path rust/Cargo.toml",
         "release-plz-v0.3.160",
         "2263c4f95eac1513da96a114a77fde20ea038742a8c8050f7514b8f93b828646",
+        "pr_count=\"$(jq -er '.prs | length'",
+        "pr_number=\"$(jq -er '.prs[0].number'",
+        "branch=\"$(jq -er '.prs[0].head_branch'",
+        "Expected one version-grouped Release PR",
         "python3 tools/sync_release_docs.py",
         "gh workflow run ci.yml",
         "gh workflow run docs.yml",