diff --git a/scripts/delete-pheaz-behind-branches.sh b/scripts/delete-pheaz-behind-branches.sh
new file mode 100755
index 0000000..c9f3b67
--- /dev/null
+++ b/scripts/delete-pheaz-behind-branches.sh
@@ -0,0 +1,269 @@
+#!/usr/bin/env bash
+# /scripts/delete-pheaz-behind-branches.sh
+
+ORG="pheaz"
+
+require_command() {
+  if ! command -v "$1" >/dev/null 2>&1; then
+    printf 'Missing required command: %s\n' "$1" >&2
+    return 2
+  fi
+}
+
+delete_branch() {
+  local repo="$1"
+  local default_branch="$2"
+  local expected_default_sha="$3"
+  local branch="$4"
+  local expected_branch_sha="$5"
+
+  local current_default_branch
+  local current_default_sha
+  local current_branch_sha
+  local delete_output
+
+  if ! current_default_branch="$(
+    gh api --method GET \
+      "repos/${repo}" \
+      --jq '.default_branch' 2>/dev/null
+  )"; then
+    printf '  [FAIL]   %-32s could not re-read repository settings\n' \
+      "$branch" >&2
+    return 1
+  fi
+
+  if [ "$current_default_branch" != "$default_branch" ]; then
+    printf '  [CHANGED] %-30s default branch changed; preserving\n' \
+      "$branch"
+    return 10
+  fi
+
+  if ! current_default_sha="$(
+    gh api --method GET \
+      "repos/${repo}/git/ref/heads/${default_branch}" \
+      --jq '.object.sha' 2>/dev/null
+  )"; then
+    printf '  [FAIL]   %-32s could not re-read default branch ref\n' \
+      "$branch" >&2
+    return 1
+  fi
+
+  if [ "$current_default_sha" != "$expected_default_sha" ]; then
+    printf '  [CHANGED] %-30s default branch moved; preserving\n' \
+      "$branch"
+    return 10
+  fi
+
+  if ! current_branch_sha="$(
+    gh api --method GET \
+      "repos/${repo}/git/ref/heads/${branch}" \
+      --jq '.object.sha' 2>/dev/null
+  )"; then
+    printf '  [CHANGED] %-30s branch no longer readable; preserving\n' \
+      "$branch"
+    return 10
+  fi
+
+  if [ "$current_branch_sha" != "$expected_branch_sha" ]; then
+    printf '  [CHANGED] %-30s branch moved during scan; preserving\n' \
+      "$branch"
+    return 10
+  fi
+
+  if delete_output="$(
+    gh api --method DELETE \
+      "repos/${repo}/git/refs/heads/${branch}" \
+      --silent 2>&1
+  )"; then
+    printf '  [DELETE] %-31s %s\n' "$branch" "$expected_branch_sha"
+    return 0
+  fi
+
+  printf '  [FAIL]   %-32s\n%s\n' "$branch" "$delete_output" >&2
+  return 1
+}
+
+scan_repository() {
+  local repo="$1"
+  local default_branch="$2"
+
+  local default_sha
+  local branches
+
+  if ! default_sha="$(
+    gh api --method GET \
+      "repos/${repo}/git/ref/heads/${default_branch}" \
+      --jq '.object.sha' 2>/dev/null
+  )"; then
+    printf '[FAIL] %-40s could not resolve default branch %s\n' \
+      "$repo" "$default_branch" >&2
+    return 1
+  fi
+
+  if ! branches="$(
+    gh api --paginate --method GET \
+      "repos/${repo}/branches" \
+      -f per_page=100 \
+      --jq '.[] | [.name, .commit.sha] | @tsv'
+  )"; then
+    printf '[FAIL] %-40s could not list branches\n' "$repo" >&2
+    return 1
+  fi
+
+  printf '\n[REPO] %s\n' "$repo"
+  printf '  Default: %s (%s)\n' "$default_branch" "$default_sha"
+
+  local branch
+  local branch_sha
+  local comparison
+  local ahead
+  local behind
+  local delete_status
+
+  local scanned=0
+  local preserved=0
+  local changed=0
+  local deleted=0
+  local failed=0
+
+  while IFS=$'\t' read -r branch branch_sha; do
+    [ -n "$branch" ] || continue
+
+    if [ "$branch" = "$default_branch" ]; then
+      continue
+    fi
+
+    scanned=$((scanned + 1))
+
+    if ! comparison="$(
+      gh api --method GET \
+        "repos/${repo}/compare/${default_sha}...${branch_sha}" \
+        --jq '[.ahead_by, .behind_by] | @tsv' 2>/dev/null
+    )"; then
+      failed=$((failed + 1))
+      printf '  [FAIL]   %-32s comparison failed\n' "$branch" >&2
+      continue
+    fi
+
+    IFS=$'\t' read -r ahead behind <<< "$comparison"
+
+    if [ "$ahead" -ne 0 ]; then
+      preserved=$((preserved + 1))
+      printf '  [KEEP]   %-32s ahead=%s behind=%s\n' \
+        "$branch" "$ahead" "$behind"
+      continue
+    fi
+
+    if [ "$behind" -eq 0 ]; then
+      preserved=$((preserved + 1))
+      printf '  [KEEP]   %-32s identical to default\n' "$branch"
+      continue
+    fi
+
+    delete_branch \
+      "$repo" \
+      "$default_branch" \
+      "$default_sha" \
+      "$branch" \
+      "$branch_sha"
+    delete_status=$?
+
+    if [ "$delete_status" -eq 0 ]; then
+      deleted=$((deleted + 1))
+    elif [ "$delete_status" -eq 10 ]; then
+      changed=$((changed + 1))
+    else
+      failed=$((failed + 1))
+    fi
+  done <<< "$branches"
+
+  printf '  Summary\n'
+  printf '    Branches scanned:  %d\n' "$scanned"
+  printf '    Preserved:         %d\n' "$preserved"
+  printf '    Changed mid-scan:  %d\n' "$changed"
+  printf '    Deleted:           %d\n' "$deleted"
+  printf '    Failed:            %d\n' "$failed"
+
+  if [ "$failed" -gt 0 ]; then
+    return 1
+  fi
+
+  return 0
+}
+
+main() {
+  require_command gh || return 2
+
+  if ! gh auth status >/dev/null 2>&1; then
+    printf 'GitHub CLI is not authenticated. Run: gh auth login\n' >&2
+    return 2
+  fi
+
+  local repositories
+
+  if ! repositories="$(
+    gh api --paginate --method GET \
+      "orgs/${ORG}/repos" \
+      -f per_page=100 \
+      -f type=all \
+      --jq '
+        .[]
+        | select(.fork == false)
+        | [.full_name, (.archived | tostring), .default_branch]
+        | @tsv
+      '
+  )"; then
+    printf 'Could not list repositories for organization: %s\n' \
+      "$ORG" >&2
+    return 2
+  fi
+
+  local scanned=0
+  local skipped=0
+  local completed=0
+  local failed=0
+
+  local repo
+  local archived
+  local default_branch
+
+  printf 'Organization: %s\n' "$ORG"
+  printf 'Policy: delete branches with ahead=0 and behind>0\n'
+
+  while IFS=$'\t' read -r repo archived default_branch; do
+    [ -n "$repo" ] || continue
+    scanned=$((scanned + 1))
+
+    if [ "$archived" = "true" ]; then
+      skipped=$((skipped + 1))
+      printf '\n[SKIP] %-40s archived repository\n' "$repo"
+      continue
+    fi
+
+    if [ -z "$default_branch" ] || [ "$default_branch" = "null" ]; then
+      skipped=$((skipped + 1))
+      printf '\n[SKIP] %-40s no default branch\n' "$repo"
+      continue
+    fi
+
+    if scan_repository "$repo" "$default_branch"; then
+      completed=$((completed + 1))
+    else
+      failed=$((failed + 1))
+    fi
+  done <<< "$repositories"
+
+  printf '\nOrganization summary\n'
+  printf '  Non-fork repos scanned: %d\n' "$scanned"
+  printf '  Repos skipped:          %d\n' "$skipped"
+  printf '  Repos completed:        %d\n' "$completed"
+  printf '  Repos with failures:    %d\n' "$failed"
+
+  if [ "$failed" -gt 0 ]; then
+    return 3
+  fi
+
+  return 0
+}
+
+main "$@"