diff --git a/scripts/pr b/scripts/pr
index d9725af11b7..77a0b8fcd93 100755
--- a/scripts/pr
+++ b/scripts/pr
@@ -505,6 +505,13 @@ EOF_MD
     "status": "none",
     "summary": "No optional nits identified."
   },
+  "behavioralSweep": {
+    "performed": true,
+    "status": "not_applicable",
+    "summary": "No runtime branch-level behavior changes require sweep evidence.",
+    "silentDropRisk": "none",
+    "branches": []
+  },
   "issueValidation": {
     "performed": true,
     "source": "pr_body",
@@ -532,6 +539,7 @@ review_validate_artifacts() {
   require_artifact .local/review.md
   require_artifact .local/review.json
   require_artifact .local/pr-meta.env
+  require_artifact .local/pr-meta.json
 
   review_guard "$pr"
 
@@ -644,11 +652,107 @@ review_validate_artifacts() {
     exit 1
   fi
 
+  local runtime_file_count
+  runtime_file_count=$(jq '[.files[]? | (.path // "") | select(test("^(src|extensions|apps)/")) | select(test("(^|/)__tests__/|\\.test\\.|\\.spec\\.") | not) | select(test("\\.(md|mdx)$") | not)] | length' .local/pr-meta.json)
+
+  local runtime_review_required="false"
+  if [ "$runtime_file_count" -gt 0 ]; then
+    runtime_review_required="true"
+  fi
+
+  local behavioral_sweep_performed
+  behavioral_sweep_performed=$(jq -r '.behavioralSweep.performed // empty' .local/review.json)
+  if [ "$behavioral_sweep_performed" != "true" ]; then
+    echo "Invalid behavioral sweep in .local/review.json: behavioralSweep.performed must be true"
+    exit 1
+  fi
+
+  local behavioral_sweep_status
+  behavioral_sweep_status=$(jq -r '.behavioralSweep.status // ""' .local/review.json)
+  case "$behavioral_sweep_status" in
+    "pass"|"needs_work"|"not_applicable")
+      ;;
+    *)
+      echo "Invalid behavioral sweep status in .local/review.json: $behavioral_sweep_status"
+      exit 1
+      ;;
+  esac
+
+  local behavioral_sweep_risk
+  behavioral_sweep_risk=$(jq -r '.behavioralSweep.silentDropRisk // ""' .local/review.json)
+  case "$behavioral_sweep_risk" in
+    "none"|"present"|"unknown")
+      ;;
+    *)
+      echo "Invalid behavioral sweep risk in .local/review.json: $behavioral_sweep_risk"
+      exit 1
+      ;;
+  esac
+
+  local invalid_behavioral_summary_count
+  invalid_behavioral_summary_count=$(jq '[.behavioralSweep.summary | select((type != "string") or (gsub("^\\s+|\\s+$";"") | length == 0))] | length' .local/review.json)
+  if [ "$invalid_behavioral_summary_count" -gt 0 ]; then
+    echo "Invalid behavioral sweep summary in .local/review.json: behavioralSweep.summary must be a non-empty string"
+    exit 1
+  fi
+
+  local behavioral_branches_is_array
+  behavioral_branches_is_array=$(jq -r 'if (.behavioralSweep.branches | type) == "array" then "true" else "false" end' .local/review.json)
+  if [ "$behavioral_branches_is_array" != "true" ]; then
+    echo "Invalid behavioral sweep in .local/review.json: behavioralSweep.branches must be an array"
+    exit 1
+  fi
+
+  local invalid_behavioral_branch_count
+  invalid_behavioral_branch_count=$(jq '[.behavioralSweep.branches[]? | select((.path|type)!="string" or (.decision|type)!="string" or (.outcome|type)!="string")] | length' .local/review.json)
+  if [ "$invalid_behavioral_branch_count" -gt 0 ]; then
+    echo "Invalid behavioral sweep branch entry in .local/review.json: each branch needs string path/decision/outcome"
+    exit 1
+  fi
+
+  local behavioral_branch_count
+  behavioral_branch_count=$(jq '[.behavioralSweep.branches[]?] | length' .local/review.json)
+
+  if [ "$runtime_review_required" = "true" ] && [ "$behavioral_sweep_status" = "not_applicable" ]; then
+    echo "Invalid behavioral sweep in .local/review.json: runtime file changes require behavioralSweep.status=pass|needs_work"
+    exit 1
+  fi
+
+  if [ "$runtime_review_required" = "true" ] && [ "$behavioral_branch_count" -lt 1 ]; then
+    echo "Invalid behavioral sweep in .local/review.json: runtime file changes require at least one branch entry"
+    exit 1
+  fi
+
+  if [ "$behavioral_sweep_status" = "not_applicable" ] && [ "$behavioral_branch_count" -gt 0 ]; then
+    echo "Invalid behavioral sweep in .local/review.json: not_applicable cannot include branch entries"
+    exit 1
+  fi
+
+  if [ "$behavioral_sweep_status" = "pass" ] && [ "$behavioral_sweep_risk" != "none" ]; then
+    echo "Invalid behavioral sweep in .local/review.json: status=pass requires silentDropRisk=none"
+    exit 1
+  fi
+
   if [ "$recommendation" = "READY FOR /prepare-pr" ] && [ "$issue_validation_status" != "valid" ]; then
     echo "Invalid recommendation in .local/review.json: READY FOR /prepare-pr requires issueValidation.status=valid"
     exit 1
   fi
 
+  if [ "$recommendation" = "READY FOR /prepare-pr" ] && [ "$behavioral_sweep_status" = "needs_work" ]; then
+    echo "Invalid recommendation in .local/review.json: READY FOR /prepare-pr requires behavioralSweep.status!=needs_work"
+    exit 1
+  fi
+
+  if [ "$recommendation" = "READY FOR /prepare-pr" ] && [ "$runtime_review_required" = "true" ] && [ "$behavioral_sweep_status" != "pass" ]; then
+    echo "Invalid recommendation in .local/review.json: READY FOR /prepare-pr on runtime changes requires behavioralSweep.status=pass"
+    exit 1
+  fi
+
+  if [ "$recommendation" = "READY FOR /prepare-pr" ] && [ "$behavioral_sweep_risk" = "present" ]; then
+    echo "Invalid recommendation in .local/review.json: READY FOR /prepare-pr is not allowed when behavioralSweep.silentDropRisk=present"
+    exit 1
+  fi
+
   local docs_status
   docs_status=$(jq -r '.docs // ""' .local/review.json)
   case "$docs_status" in