diff --git a/services/task-watcher/mode.py b/services/task-watcher/mode.py
new file mode 100644
index 0000000..075ac65
--- /dev/null
+++ b/services/task-watcher/mode.py
@@ -0,0 +1,57 @@
+"""시간대 + 휴장일 기반 모드 판정 (idle 감지 생략 — 박재오 결정 2026-05-22).
+
+trading: 비휴장 평일 07:00–16:30 (장중) → queue:paused SET
+free:    그 외 (장 전/후, 주말, 휴장) → queue:paused DEL
+"""
+from __future__ import annotations
+
+import datetime as dt
+import logging
+import os
+from typing import Set
+from zoneinfo import ZoneInfo
+
+import httpx
+
+logger = logging.getLogger(__name__)
+
+KST = ZoneInfo("Asia/Seoul")
+STOCK_BASE_URL = os.getenv("STOCK_BASE_URL", "http://192.168.45.54:18500")
+
+# 트레이딩 윈도우 (HH:MM, KST). .env로 조정 가능.
+TRADING_START = os.getenv("TRADING_START", "07:00")
+TRADING_END = os.getenv("TRADING_END", "16:30")
+
+
+def _parse_hhmm(s: str) -> dt.time:
+    hh, mm = s.split(":")
+    return dt.time(int(hh), int(mm))
+
+
+def current_mode(now: dt.datetime, holidays: Set[str]) -> str:
+    """now(KST aware) + holidays(ISO date set) → 'trading' | 'free'."""
+    # 주말 (토=5, 일=6)
+    if now.weekday() >= 5:
+        return "free"
+    # 휴장일
+    if now.date().isoformat() in holidays:
+        return "free"
+    # 트레이딩 윈도우 [start, end)
+    start = _parse_hhmm(TRADING_START)
+    end = _parse_hhmm(TRADING_END)
+    t = now.timetz().replace(tzinfo=None)
+    if start <= t < end:
+        return "trading"
+    return "free"
+
+
+def fetch_holidays() -> Set[str]:
+    """NAS stock /api/stock/holidays 조회. 실패 시 빈 set (안전 — free로 판정)."""
+    try:
+        r = httpx.get(f"{STOCK_BASE_URL}/api/stock/holidays", timeout=10.0)
+        if r.status_code == 200:
+            return set(r.json().get("holidays", []))
+        logger.warning("holidays fetch returned %d", r.status_code)
+    except Exception:
+        logger.exception("holidays fetch 실패")
+    return set()
diff --git a/services/task-watcher/tests/__init__.py b/services/task-watcher/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/services/task-watcher/tests/test_mode.py b/services/task-watcher/tests/test_mode.py
new file mode 100644
index 0000000..42d2995
--- /dev/null
+++ b/services/task-watcher/tests/test_mode.py
@@ -0,0 +1,44 @@
+"""current_mode — 시간대 + 휴장일 판정 (순수 함수)."""
+import datetime as dt
+from zoneinfo import ZoneInfo
+
+from mode import current_mode
+
+KST = ZoneInfo("Asia/Seoul")
+HOLIDAYS = {"2026-05-25"}  # 가상 휴장일 (월요일)
+
+
+def _kst(y, m, d, hh, mm):
+    return dt.datetime(y, m, d, hh, mm, tzinfo=KST)
+
+
+def test_weekday_trading_hours_is_trading():
+    # 2026-05-22 금요일 10:00 — 트레이딩 시간대
+    assert current_mode(_kst(2026, 5, 22, 10, 0), HOLIDAYS) == "trading"
+
+
+def test_weekday_before_open_is_free():
+    # 평일 06:00 — 장 전
+    assert current_mode(_kst(2026, 5, 22, 6, 0), HOLIDAYS) == "free"
+
+
+def test_weekday_after_close_is_free():
+    # 평일 17:00 — 장 마감 후
+    assert current_mode(_kst(2026, 5, 22, 17, 0), HOLIDAYS) == "free"
+
+
+def test_weekend_is_free():
+    # 2026-05-23 토요일 10:00
+    assert current_mode(_kst(2026, 5, 23, 10, 0), HOLIDAYS) == "free"
+
+
+def test_holiday_weekday_is_free():
+    # 2026-05-25 월요일이지만 휴장일 → 트레이딩 시간대라도 free
+    assert current_mode(_kst(2026, 5, 25, 10, 0), HOLIDAYS) == "free"
+
+
+def test_trading_boundary_inclusive_start_exclusive_end():
+    # 07:00 정각 = 트레이딩 시작, 16:30 정각 = 마감 (16:30은 free)
+    assert current_mode(_kst(2026, 5, 22, 7, 0), HOLIDAYS) == "trading"
+    assert current_mode(_kst(2026, 5, 22, 16, 29), HOLIDAYS) == "trading"
+    assert current_mode(_kst(2026, 5, 22, 16, 30), HOLIDAYS) == "free"