diff --git a/.gitignore b/.gitignore
index 71fbbb008..24598ac37 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,8 @@
 .vscode
 .cursor
 .direnv/
+.claude/
+.tmp/
 /test
 /logs
 /data
diff --git a/docker-compose.decommission.yml b/docker-compose.decommission.yml
index d8fc2b281..8c3f1233c 100644
--- a/docker-compose.decommission.yml
+++ b/docker-compose.decommission.yml
@@ -58,5 +58,24 @@ services:
     networks:
       - rustfs-decommission-network
 
+  rustfs-decommission-tier:
+    image: ${RUSTFS_TIER_DOCKER_IMAGE:-minio/minio:latest}
+    command:
+      - server
+      - /data
+      - --console-address
+      - ":9001"
+    ports:
+      - "9200:9000"
+      - "9201:9001"
+    environment:
+      MINIO_ROOT_USER: "minioadmin"
+      MINIO_ROOT_PASSWORD: "minioadmin"
+    volumes:
+      - ./deploy/data/decommission-tier:/data
+    restart: unless-stopped
+    networks:
+      - rustfs-decommission-network
+
 networks:
   rustfs-decommission-network:
diff --git a/scripts/test/decommission_docker.md b/scripts/test/decommission_docker.md
index 6e7f2d972..de895dc76 100644
--- a/scripts/test/decommission_docker.md
+++ b/scripts/test/decommission_docker.md
@@ -5,10 +5,12 @@ This setup simulates a two-pool RustFS cluster locally with Docker so decommissi
 ## Topology
 
 - One RustFS container
+- One disposable MinIO container for tier/lifecycle validation
 - Two pools
 - Four disks per pool
 - S3 API on `http://127.0.0.1:9100`
 - Console on `http://127.0.0.1:9101`
+- Tier backend S3 API on `http://127.0.0.1:9200`
 
 Pool cmdlines used by admin decommission:
 
diff --git a/scripts/test/decommission_docker.sh b/scripts/test/decommission_docker.sh
index b8b205421..2486b584e 100755
--- a/scripts/test/decommission_docker.sh
+++ b/scripts/test/decommission_docker.sh
@@ -87,7 +87,7 @@ configure_alias() {
 up() {
     require_bin docker
     require_bin mc
-    mkdir -p deploy/data/decommission deploy/logs/decommission
+    mkdir -p deploy/data/decommission deploy/data/decommission-tier deploy/logs/decommission
     compose up -d
     wait_healthy
     configure_alias
@@ -107,7 +107,7 @@ down() {
 reset() {
     require_bin docker
     compose down -v --remove-orphans || true
-    rm -rf deploy/data/decommission deploy/logs/decommission .tmp/decommission-validation
+    rm -rf deploy/data/decommission deploy/data/decommission-tier deploy/logs/decommission .tmp/decommission-validation
     echo "local decommission docker environment reset"
 }
 
diff --git a/scripts/test/decommission_tier_lifecycle_recovery.md b/scripts/test/decommission_tier_lifecycle_recovery.md
new file mode 100644
index 000000000..0a9176c62
--- /dev/null
+++ b/scripts/test/decommission_tier_lifecycle_recovery.md
@@ -0,0 +1,112 @@
+# Decommission Tier Lifecycle Recovery
+
+This manual E2E flow covers the Tier + ILM + Decommission interaction path
+against a disposable local deployment.
+
+## Goal
+
+Validate that transitioned objects can be expired and recovered safely while
+decommission also handles tiered objects without removing remote tier data
+incorrectly.
+
+## What It Covers
+
+- RustFS tier configuration backed by a disposable MinIO service.
+- Immediate transition of two object prefixes to the configured tier.
+- Lifecycle expiry of transitioned objects with RustFS restart recovery.
+- Concurrent GET traffic while expiry and cleanup are running.
+- Decommission of a pool containing transitioned objects.
+- Remote tier count checks before and after decommission.
+
+## What It Does Not Cover Automatically
+
+- True distributed node failure injection.
+- Long-running high-cardinality stress with 10,000+ objects.
+- Replication target side-effects.
+- All lifecycle worker pause/failure modes.
+
+Those scenarios should be added as nightly or cluster-specific E2E coverage
+after this manual flow is stable.
+
+## Prerequisites
+
+- Docker with Compose support.
+- `mc` configured or available on `PATH`.
+- `awscurl` available on `PATH`.
+- The local RustFS image used by `docker-compose.decommission.yml`.
+
+If the RustFS image is not present, build it first:
+
+```bash
+./scripts/test/decommission_docker.sh build
+```
+
+## Quick Start
+
+Run the full flow:
+
+```bash
+./scripts/test/decommission_tier_lifecycle_recovery.sh run
+```
+
+Clean up all generated containers, data, logs, and state:
+
+```bash
+./scripts/test/decommission_tier_lifecycle_recovery.sh reset
+```
+
+## Manual Flow
+
+```bash
+./scripts/test/decommission_tier_lifecycle_recovery.sh up
+./scripts/test/decommission_tier_lifecycle_recovery.sh prepare
+./scripts/test/decommission_tier_lifecycle_recovery.sh wait-transition
+./scripts/test/decommission_tier_lifecycle_recovery.sh expire-recovery
+./scripts/test/decommission_tier_lifecycle_recovery.sh decommission
+./scripts/test/decommission_tier_lifecycle_recovery.sh verify
+```
+
+## Useful Overrides
+
+- `OBJECT_COUNT=100` increases objects per prefix.
+- `TRANSITION_DAYS=0` keeps transition immediate.
+- `EXPIRY_DAYS=0` keeps expiry immediate for local validation.
+- `WAIT_TIMEOUT_SECONDS=1800` gives slow machines more time.
+- `GET_WORKERS=32` increases concurrent GET pressure.
+- `GET_LOAD_SECONDS=300` keeps GET traffic running longer.
+
+Example:
+
+```bash
+OBJECT_COUNT=100 GET_WORKERS=32 WAIT_TIMEOUT_SECONDS=1800 \
+  ./scripts/test/decommission_tier_lifecycle_recovery.sh run
+```
+
+## Expected Output
+
+The flow should end with:
+
+- transitioned `expire/` objects no longer readable as current objects
+- remote tier object count drained by at least the number of expired objects
+- concurrent GET log without `NoSuchVersion` or invalid version-state errors
+- transitioned `decom/` objects still readable after decommission
+- remote tier object count not lower after decommission
+
+The script stores evidence under `.tmp/decommission-tier-lifecycle/work`,
+including scanner status samples, decommission status output, and concurrent
+GET stderr.
+
+Missed lifecycle or journal-style counters may increase during restart or queue
+pressure, but recovery should leave no residual cleanup work for the expired
+objects.
+
+## Nightly Follow-Up
+
+Before wiring this into nightly CI, run it repeatedly with larger `OBJECT_COUNT`
+values and collect:
+
+- scanner status samples
+- tier backend object counts before and after expiry
+- GET error logs
+- decommission status JSON
+- total runtime and flake rate
diff --git a/scripts/test/decommission_tier_lifecycle_recovery.sh b/scripts/test/decommission_tier_lifecycle_recovery.sh
new file mode 100755
index 000000000..77bb12920
--- /dev/null
+++ b/scripts/test/decommission_tier_lifecycle_recovery.sh
@@ -0,0 +1,604 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.decommission.yml}"
+RUSTFS_SERVICE_NAME="${RUSTFS_SERVICE_NAME:-rustfs-decommission-latest}"
+TIER_SERVICE_NAME="${TIER_SERVICE_NAME:-rustfs-decommission-tier}"
+MC_ALIAS_NAME="${MC_ALIAS_NAME:-rustfs-decom}"
+TIER_ALIAS_NAME="${TIER_ALIAS_NAME:-rustfs-decom-tier}"
+S3_ENDPOINT="${S3_ENDPOINT:-http://127.0.0.1:9100}"
+TIER_ENDPOINT="${TIER_ENDPOINT:-http://127.0.0.1:9200}"
+TIER_ENDPOINT_FROM_RUSTFS="${TIER_ENDPOINT_FROM_RUSTFS:-http://rustfs-decommission-tier:9000}"
+ACCESS_KEY="${ACCESS_KEY:-rustfsadmin}"
+SECRET_KEY="${SECRET_KEY:-rustfsadmin}"
+TIER_ACCESS_KEY="${TIER_ACCESS_KEY:-minioadmin}"
+TIER_SECRET_KEY="${TIER_SECRET_KEY:-minioadmin}"
+TIER_NAME="${TIER_NAME:-COLDTIER}"
+TIER_BUCKET="${TIER_BUCKET:-rustfs-tier}"
+TIER_PREFIX="${TIER_PREFIX:-decommission-tier}"
+POOL_CMDLINE="${POOL_CMDLINE:-/data/pool1/disk{1...4}}"
+STATE_DIR="${DECOM_TIER_STATE_DIR:-.tmp/decommission-tier-lifecycle}"
+OBJECT_COUNT="${OBJECT_COUNT:-12}"
+TRANSITION_DAYS="${TRANSITION_DAYS:-0}"
+EXPIRY_DAYS="${EXPIRY_DAYS:-0}"
+WAIT_TIMEOUT_SECONDS="${WAIT_TIMEOUT_SECONDS:-900}"
+POLL_INTERVAL_SECONDS="${POLL_INTERVAL_SECONDS:-5}"
+GET_WORKERS="${GET_WORKERS:-8}"
+GET_LOAD_SECONDS="${GET_LOAD_SECONDS:-60}"
+SCANNER_SAMPLES="${SCANNER_SAMPLES:-3}"
+SCANNER_INTERVAL_SECONDS="${SCANNER_INTERVAL_SECONDS:-10}"
+
+usage() {
+    cat <<'EOF'
+Usage:
+  decommission_tier_lifecycle_recovery.sh up
+  decommission_tier_lifecycle_recovery.sh prepare
+  decommission_tier_lifecycle_recovery.sh wait-transition
+  decommission_tier_lifecycle_recovery.sh expire-recovery
+  decommission_tier_lifecycle_recovery.sh decommission
+  decommission_tier_lifecycle_recovery.sh verify
+  decommission_tier_lifecycle_recovery.sh run
+  decommission_tier_lifecycle_recovery.sh status
+  decommission_tier_lifecycle_recovery.sh down
+  decommission_tier_lifecycle_recovery.sh reset
+
+Environment:
+  COMPOSE_FILE              Compose file. Default: docker-compose.decommission.yml
+  MC_ALIAS_NAME             RustFS mc alias. Default: rustfs-decom
+  TIER_ALIAS_NAME           tier backend mc alias. Default: rustfs-decom-tier
+  S3_ENDPOINT               RustFS endpoint from host. Default: http://127.0.0.1:9100
+  TIER_ENDPOINT             MinIO tier endpoint from host. Default: http://127.0.0.1:9200
+  TIER_ENDPOINT_FROM_RUSTFS MinIO endpoint reachable by RustFS container.
+  TIER_NAME                 RustFS tier name. Must be uppercase. Default: COLDTIER
+  OBJECT_COUNT              Objects per lifecycle/decommission prefix. Default: 12
+  TRANSITION_DAYS           Lifecycle transition days. Default: 0
+  EXPIRY_DAYS               Lifecycle expiry days for expire/ objects. Default: 0
+  WAIT_TIMEOUT_SECONDS      Poll timeout for transition/expiry/decommission. Default: 900
+
+The run target starts a local RustFS two-pool deployment plus a disposable
+MinIO tier backend, transitions two object prefixes, restarts RustFS to exercise
+recovery, expires one prefix while concurrent GET runs, then decommissions the
+second prefix's pool and verifies remote tier data was not removed.
+EOF
+}
+
+require_bin() {
+    if ! command -v "$1" >/dev/null 2>&1; then
+        echo "missing required binary: $1" >&2
+        exit 1
+    fi
+}
+
+is_positive_integer() {
+    [[ "$1" =~ ^[1-9][0-9]*$ ]]
+}
+
+is_nonnegative_integer() {
+    [[ "$1" =~ ^[0-9]+$ ]]
+}
+
+validate_numeric_env() {
+    if ! is_positive_integer "$OBJECT_COUNT"; then
+        echo "OBJECT_COUNT must be a positive integer" >&2
+        exit 1
+    fi
+    if ! is_nonnegative_integer "$TRANSITION_DAYS" || ! is_nonnegative_integer "$EXPIRY_DAYS"; then
+        echo "TRANSITION_DAYS and EXPIRY_DAYS must be nonnegative integers" >&2
+        exit 1
+    fi
+    if ! is_positive_integer "$WAIT_TIMEOUT_SECONDS" || ! is_positive_integer "$POLL_INTERVAL_SECONDS"; then
+        echo "WAIT_TIMEOUT_SECONDS and POLL_INTERVAL_SECONDS must be positive integers" >&2
+        exit 1
+    fi
+}
+
+compose() {
+    docker compose -f "$COMPOSE_FILE" "$@"
+}
+
+state_file() {
+    printf '%s/state.env\n' "$STATE_DIR"
+}
+
+work_dir() {
+    printf '%s/work\n' "$STATE_DIR"
+}
+
+load_state() {
+    local file
+    file="$(state_file)"
+    if [[ ! -f "$file" ]]; then
+        echo "state file not found: $file; run prepare first" >&2
+        exit 1
+    fi
+    # shellcheck disable=SC1090
+    source "$file"
+}
+
+write_state() {
+    mkdir -p "$STATE_DIR"
+    cat >"$(state_file)" <<EOF
+RUN_ID='$RUN_ID'
+TEST_BUCKET='$TEST_BUCKET'
+EXPIRY_PREFIX='$EXPIRY_PREFIX'
+DECOM_PREFIX='$DECOM_PREFIX'
+TIER_NAME='$TIER_NAME'
+TIER_BUCKET='$TIER_BUCKET'
+TIER_PREFIX='$TIER_PREFIX'
+REMOTE_AFTER_TRANSITION='${REMOTE_AFTER_TRANSITION:-0}'
+REMOTE_BEFORE_DECOMMISSION='${REMOTE_BEFORE_DECOMMISSION:-0}'
+EOF
+}
+
+update_state_value() {
+    local key="$1"
+    local value="$2"
+    load_state
+    case "$key" in
+        REMOTE_AFTER_TRANSITION) REMOTE_AFTER_TRANSITION="$value" ;;
+        REMOTE_BEFORE_DECOMMISSION) REMOTE_BEFORE_DECOMMISSION="$value" ;;
+        *)
+            echo "unsupported state key: $key" >&2
+            exit 1
+            ;;
+    esac
+    write_state
+}
+
+urlencode() {
+    local raw="$1"
+    if command -v jq >/dev/null 2>&1; then
+        jq -rn --arg v "$raw" '$v|@uri'
+        return
+    fi
+    python3 -c 'import sys, urllib.parse; print(urllib.parse.quote(sys.argv[1], safe=""))' "$raw"
+}
+
+admin_request() {
+    local method="$1"
+    local path="$2"
+    local body_file="${3:-}"
+    local url="${S3_ENDPOINT%/}/rustfs/admin/v3${path}"
+
+    if [[ -n "$body_file" ]]; then
+        local body
+        body="$(<"$body_file")"
+        awscurl \
+            --fail-with-body \
+            --service s3 \
+            --region us-east-1 \
+            --access_key "$ACCESS_KEY" \
+            --secret_key "$SECRET_KEY" \
+            -H "Content-Type: application/json" \
+            -X "$method" \
+            -d "$body" \
+            "$url"
+    else
+        awscurl \
+            --fail-with-body \
+            --service s3 \
+            --region us-east-1 \
+            --access_key "$ACCESS_KEY" \
+            --secret_key "$SECRET_KEY" \
+            -X "$method" \
+            "$url"
+    fi
+}
+
+wait_container_ready() {
+    local service="$1"
+    local elapsed=0
+    local container_id
+    container_id="$(compose ps -q "$service")"
+    if [[ -z "$container_id" ]]; then
+        echo "container not found for service $service" >&2
+        exit 1
+    fi
+
+    while (( elapsed < WAIT_TIMEOUT_SECONDS )); do
+        local status
+        status="$(docker inspect --format '{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}' "$container_id")"
+        if [[ "$status" == "healthy" || "$status" == "running" ]]; then
+            echo "$service is $status"
+            return
+        fi
+        sleep "$POLL_INTERVAL_SECONDS"
+        elapsed=$((elapsed + POLL_INTERVAL_SECONDS))
+    done
+
+    echo "$service did not become ready within ${WAIT_TIMEOUT_SECONDS}s" >&2
+    compose logs --tail=200 "$service" || true
+    exit 1
+}
+
+configure_aliases() {
+    require_bin mc
+    mc alias set "$MC_ALIAS_NAME" "$S3_ENDPOINT" "$ACCESS_KEY" "$SECRET_KEY" >/dev/null
+    mc alias set "$TIER_ALIAS_NAME" "$TIER_ENDPOINT" "$TIER_ACCESS_KEY" "$TIER_SECRET_KEY" >/dev/null
+    echo "configured aliases: $MC_ALIAS_NAME, $TIER_ALIAS_NAME"
+}
+
+wait_tier_backend_ready() {
+    local elapsed=0
+    while (( elapsed < WAIT_TIMEOUT_SECONDS )); do
+        if mc alias set "$TIER_ALIAS_NAME" "$TIER_ENDPOINT" "$TIER_ACCESS_KEY" "$TIER_SECRET_KEY" >/dev/null 2>&1 \
+            && mc ls "$TIER_ALIAS_NAME" >/dev/null 2>&1; then
+            echo "tier backend is ready"
+            return
+        fi
+        sleep "$POLL_INTERVAL_SECONDS"
+        elapsed=$((elapsed + POLL_INTERVAL_SECONDS))
+    done
+
+    echo "tier backend did not become ready within ${WAIT_TIMEOUT_SECONDS}s" >&2
+    compose logs --tail=200 "$TIER_SERVICE_NAME" || true
+    exit 1
+}
+
+up() {
+    require_bin docker
+    require_bin mc
+    mkdir -p deploy/data/decommission deploy/logs/decommission deploy/data/decommission-tier
+    compose up -d "$TIER_SERVICE_NAME" "$RUSTFS_SERVICE_NAME"
+    wait_container_ready "$TIER_SERVICE_NAME"
+    wait_tier_backend_ready
+    wait_container_ready "$RUSTFS_SERVICE_NAME"
+    configure_aliases
+    mc mb --ignore-existing "${TIER_ALIAS_NAME}/${TIER_BUCKET}"
+}
+
+down() {
+    require_bin docker
+    compose down
+}
+
+reset() {
+    require_bin docker
+    compose down -v --remove-orphans || true
+    rm -rf deploy/data/decommission deploy/logs/decommission deploy/data/decommission-tier "$STATE_DIR"
+    echo "tier lifecycle decommission environment reset"
+}
+
+write_tier_config() {
+    local file="$1"
+    cat >"$file" <<EOF
+{
+  "type": "minio",
+  "minio": {
+    "name": "${TIER_NAME}",
+    "endpoint": "${TIER_ENDPOINT_FROM_RUSTFS}",
+    "accessKey": "${TIER_ACCESS_KEY}",
+    "secretKey": "${TIER_SECRET_KEY}",
+    "bucket": "${TIER_BUCKET}",
+    "prefix": "${TIER_PREFIX}/${RUN_ID}",
+    "region": "us-east-1"
+  }
+}
+EOF
+}
+
+write_lifecycle_config() {
+    local file="$1"
+    local include_expiry="$2"
+    local expiry_block=""
+    if [[ "$include_expiry" == "true" ]]; then
+        expiry_block='
+      "Expiration": {
+        "Days": '"${EXPIRY_DAYS}"'
+      },'
+    fi
+
+    cat >"$file" <<EOF
+{
+  "Rules": [
+    {
+      "ID": "transition-expire-prefix",
+      "Status": "Enabled",
+      "Filter": {
+        "Prefix": "${EXPIRY_PREFIX}"
+      },${expiry_block}
+      "Transition": {
+        "Days": ${TRANSITION_DAYS},
+        "StorageClass": "${TIER_NAME}"
+      }
+    },
+    {
+      "ID": "transition-decommission-prefix",
+      "Status": "Enabled",
+      "Filter": {
+        "Prefix": "${DECOM_PREFIX}"
+      },
+      "Transition": {
+        "Days": ${TRANSITION_DAYS},
+        "StorageClass": "${TIER_NAME}"
+      }
+    }
+  ]
+}
+EOF
+}
+
+prepare() {
+    require_bin mc
+    require_bin awscurl
+    validate_numeric_env
+
+    RUN_ID="$(date -u +%Y%m%d%H%M%S)-$$"
+    TEST_BUCKET="decom-tier-${RUN_ID}"
+    EXPIRY_PREFIX="expire/"
+    DECOM_PREFIX="decom/"
+    REMOTE_AFTER_TRANSITION=0
+    REMOTE_BEFORE_DECOMMISSION=0
+
+    local dir
+    dir="$(work_dir)"
+    mkdir -p "$dir"
+    write_state
+
+    local tier_config lifecycle_config payload
+    tier_config="${dir}/tier-config.json"
+    lifecycle_config="${dir}/lifecycle-transition.json"
+    payload="${dir}/payload.txt"
+
+    write_tier_config "$tier_config"
+    admin_request DELETE "/tier/$(urlencode "$TIER_NAME")?force=true" >/dev/null 2>&1 || true
+    admin_request PUT "/tier?force=true" "$tier_config"
+    admin_request GET "/tier/$(urlencode "$TIER_NAME")" >/dev/null
+
+    mc mb --ignore-existing "${MC_ALIAS_NAME}/${TEST_BUCKET}"
+    write_lifecycle_config "$lifecycle_config" false
+    mc ilm import "${MC_ALIAS_NAME}/${TEST_BUCKET}" <"$lifecycle_config"
+
+    for i in $(seq 1 "$OBJECT_COUNT"); do
+        printf 'expiry object %s run %s\n' "$i" "$RUN_ID" >"$payload"
+        mc cp "$payload" "${MC_ALIAS_NAME}/${TEST_BUCKET}/${EXPIRY_PREFIX}obj-${i}.txt" >/dev/null
+        printf 'decommission object %s run %s\n' "$i" "$RUN_ID" >"$payload"
+        mc cp "$payload" "${MC_ALIAS_NAME}/${TEST_BUCKET}/${DECOM_PREFIX}obj-${i}.txt" >/dev/null
+    done
+
+    echo "prepared bucket: ${TEST_BUCKET}"
+}
+
+remote_count() {
+    load_state
+    mc find "${TIER_ALIAS_NAME}/${TIER_BUCKET}/${TIER_PREFIX}/${RUN_ID}" --type f 2>/dev/null | wc -l | tr -d ' '
+}
+
+wait_transition() {
+    require_bin mc
+    load_state
+
+    local expected elapsed count
+    expected=$((OBJECT_COUNT * 2))
+    elapsed=0
+    while (( elapsed < WAIT_TIMEOUT_SECONDS )); do
+        count="$(remote_count)"
+        echo "remote tier object count: ${count}/${expected}"
+        if (( count >= expected )); then
+            update_state_value REMOTE_AFTER_TRANSITION "$count"
+            echo "transition completed"
+            return
+        fi
+        sleep "$POLL_INTERVAL_SECONDS"
+        elapsed=$((elapsed + POLL_INTERVAL_SECONDS))
+    done
+
+    echo "timed out waiting for transitioned objects in tier backend" >&2
+    exit 1
+}
+
+start_get_load() {
+    load_state
+    local dir errors pids_file
+    dir="$(work_dir)"
+    mkdir -p "$dir"
+    errors="${dir}/get-errors.log"
+    pids_file="${dir}/get-load.pids"
+    : >"$errors"
+    : >"$pids_file"
+
+    for worker in $(seq 1 "$GET_WORKERS"); do
+        (
+            end_at=$((SECONDS + GET_LOAD_SECONDS))
+            while (( SECONDS < end_at )); do
+                idx=$(( (RANDOM % OBJECT_COUNT) + 1 ))
+                mc cat "${MC_ALIAS_NAME}/${TEST_BUCKET}/${EXPIRY_PREFIX}obj-${idx}.txt" >/dev/null 2>>"$errors" || true
+            done
+        ) &
+        echo "$!" >>"$pids_file"
+    done
+}
+
+wait_get_load() {
+    local pids_file
+    pids_file="$(work_dir)/get-load.pids"
+    if [[ ! -f "$pids_file" ]]; then
+        return
+    fi
+    while read -r pid; do
+        [[ -z "$pid" ]] && continue
+        wait "$pid" || true
+    done <"$pids_file"
+}
+
+assert_no_bad_get_errors() {
+    local errors
+    errors="$(work_dir)/get-errors.log"
+    if [[ ! -f "$errors" ]]; then
+        return
+    fi
+    if grep -E 'NoSuchVersion|remote.*NoSuch|invalid.*version' "$errors" >/dev/null 2>&1; then
+        echo "concurrent GET observed invalid version-state errors:" >&2
+        grep -E 'NoSuchVersion|remote.*NoSuch|invalid.*version' "$errors" >&2
+        exit 1
+    fi
+}
+
+restart_rustfs() {
+    require_bin docker
+    compose restart "$RUSTFS_SERVICE_NAME"
+    wait_container_ready "$RUSTFS_SERVICE_NAME"
+    configure_aliases
+}
+
+expired_count() {
+    load_state
+    local expired=0
+    for i in $(seq 1 "$OBJECT_COUNT"); do
+        if ! mc stat "${MC_ALIAS_NAME}/${TEST_BUCKET}/${EXPIRY_PREFIX}obj-${i}.txt" >/dev/null 2>&1; then
+            expired=$((expired + 1))
+        fi
+    done
+    printf '%s\n' "$expired"
+}
+
+wait_expiry_and_cleanup() {
+    load_state
+    local dir lifecycle_config before expected_max elapsed expired count
+    dir="$(work_dir)"
+    lifecycle_config="${dir}/lifecycle-expire.json"
+    write_lifecycle_config "$lifecycle_config" true
+
+    before="$(remote_count)"
+    mc ilm import "${MC_ALIAS_NAME}/${TEST_BUCKET}" <"$lifecycle_config"
+    restart_rustfs
+    start_get_load
+
+    expected_max=$((before - OBJECT_COUNT))
+    if (( expected_max < 0 )); then
+        expected_max=0
+    fi
+
+    elapsed=0
+    while (( elapsed < WAIT_TIMEOUT_SECONDS )); do
+        expired="$(expired_count)"
+        count="$(remote_count)"
+        echo "expiry progress: expired=${expired}/${OBJECT_COUNT}, remote=${count}, target_remote<=${expected_max}"
+        if (( expired >= OBJECT_COUNT && count <= expected_max )); then
+            wait_get_load
+            assert_no_bad_get_errors
+            echo "lifecycle expiry and remote cleanup completed"
+            return
+        fi
+        sleep "$POLL_INTERVAL_SECONDS"
+        elapsed=$((elapsed + POLL_INTERVAL_SECONDS))
+    done
+
+    wait_get_load
+    assert_no_bad_get_errors
+    echo "timed out waiting for lifecycle expiry cleanup" >&2
+    exit 1
+}
+
+run_decommission() {
+    require_bin mc
+    load_state
+    local before
+    before="$(remote_count)"
+    update_state_value REMOTE_BEFORE_DECOMMISSION "$before"
+    ./scripts/test/decommission_validation.sh start "$MC_ALIAS_NAME" "$POOL_CMDLINE"
+    ./scripts/test/decommission_validation.sh wait "$MC_ALIAS_NAME" "$POOL_CMDLINE" "$WAIT_TIMEOUT_SECONDS"
+}
+
+verify_decommission() {
+    load_state
+    local after
+    for i in $(seq 1 "$OBJECT_COUNT"); do
+        mc stat "${MC_ALIAS_NAME}/${TEST_BUCKET}/${DECOM_PREFIX}obj-${i}.txt" >/dev/null
+    done
+
+    after="$(remote_count)"
+    if (( after < REMOTE_BEFORE_DECOMMISSION )); then
+        echo "remote tier object count decreased during decommission: before=${REMOTE_BEFORE_DECOMMISSION}, after=${after}" >&2
+        exit 1
+    fi
+
+    echo "decommission verification passed; remote tier count before=${REMOTE_BEFORE_DECOMMISSION}, after=${after}"
+}
+
+capture_scanner_status() {
+    require_bin awscurl
+    load_state
+    local out_dir
+    out_dir="$(work_dir)/scanner-status"
+    mkdir -p "$out_dir"
+
+    for i in $(seq 1 "$SCANNER_SAMPLES"); do
+        admin_request GET "/scanner/status" >"${out_dir}/scanner-status-${i}.json" || true
+        sleep "$SCANNER_INTERVAL_SECONDS"
+    done
+    echo "scanner status samples: ${out_dir}"
+}
+
+capture_decommission_status() {
+    load_state
+    local out_dir
+    out_dir="$(work_dir)/decommission-status"
+    mkdir -p "$out_dir"
+    ./scripts/test/decommission_validation.sh status "$MC_ALIAS_NAME" "$POOL_CMDLINE" >"${out_dir}/status.txt" 2>&1 || true
+    echo "decommission status sample: ${out_dir}/status.txt"
+}
+
+status() {
+    load_state
+    echo "bucket: ${TEST_BUCKET}"
+    echo "tier backend objects: $(remote_count)"
+    admin_request GET "/tier-stats?tier=$(urlencode "$TIER_NAME")" || true
+    echo
+    ./scripts/test/decommission_validation.sh status "$MC_ALIAS_NAME" "$POOL_CMDLINE" || true
+}
+
+verify() {
+    load_state
+    assert_no_bad_get_errors
+    verify_decommission
+    capture_decommission_status
+    capture_scanner_status
+    cat <<EOF
+verification passed:
+  - expire/ objects are expired and remote tier cleanup reached the expected count
+  - concurrent GET did not emit NoSuchVersion or invalid version-state errors
+  - decom/ tiered objects remain readable after decommission
+  - remote tier object count did not decrease during decommission
+
+manual evidence:
+  - inspect $(work_dir)/scanner-status for missed/recovery counters
+  - inspect $(work_dir)/get-errors.log for any unexpected non-version errors
+EOF
+}
+
+run_all() {
+    up
+    prepare
+    wait_transition
+    wait_expiry_and_cleanup
+    run_decommission
+    verify
+}
+
+main() {
+    if [[ $# -ne 1 ]]; then
+        usage
+        exit 1
+    fi
+
+    case "$1" in
+        up) up ;;
+        prepare) prepare ;;
+        wait-transition) wait_transition ;;
+        expire-recovery) wait_expiry_and_cleanup ;;
+        decommission) run_decommission ;;
+        verify) verify ;;
+        run) run_all ;;
+        status) status ;;
+        down) down ;;
+        reset) reset ;;
+        -h|--help) usage ;;
+        *)
+            usage
+            exit 1
+            ;;
+    esac
+}
+
+main "$@"