feat: /notify command for runtime notification filter control (#161)

Add /notify Telegram command for adjusting notification filters at runtime
without restarting the service:

  /notify                  → show current filter state
  /notify scenario off     → disable scenario match alerts
  /notify market off       → disable market open/close alerts
  /notify all off          → disable all (circuit_breaker always on)
  /notify trades on        → re-enable trade execution alerts

Changes:
- NotificationFilter: add KEYS class var, set_flag(), as_dict()
- TelegramClient: add set_notification(), filter_status()
- TelegramCommandHandler: add register_command_with_args() + args dispatch
- main.py: handle_notify() handler + register /notify command + /help update
- Tests: 12 new tests (set_flag, set_notification, register_command_with_args)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/config.py

@@ -93,6 +93,16 @@ class Settings(BaseSettings):
     TELEGRAM_COMMANDS_ENABLED: bool = True
     TELEGRAM_POLLING_INTERVAL: float = 1.0  # seconds
 
+    # Telegram notification type filters (granular control)
+    # circuit_breaker is always sent regardless — safety-critical
+    TELEGRAM_NOTIFY_TRADES: bool = True           # BUY/SELL execution alerts
+    TELEGRAM_NOTIFY_MARKET_OPEN_CLOSE: bool = True  # Market open/close alerts
+    TELEGRAM_NOTIFY_FAT_FINGER: bool = True       # Fat-finger rejection alerts
+    TELEGRAM_NOTIFY_SYSTEM_EVENTS: bool = True    # System start/shutdown alerts
+    TELEGRAM_NOTIFY_PLAYBOOK: bool = True         # Playbook generated/failed alerts
+    TELEGRAM_NOTIFY_SCENARIO_MATCH: bool = True   # Scenario matched alerts (most frequent)
+    TELEGRAM_NOTIFY_ERRORS: bool = True           # Error alerts
+
     # Overseas ranking API (KIS endpoint/TR_ID may vary by account/product)
     # Override these from .env if your account uses different specs.
     OVERSEAS_RANKING_ENABLED: bool = True

src/main.py

@@ -41,7 +41,7 @@ from src.evolution.optimizer import EvolutionOptimizer
 from src.logging.decision_logger import DecisionLogger
 from src.logging_config import setup_logging
 from src.markets.schedule import MarketInfo, get_next_market_open, get_open_markets
-from src.notifications.telegram_client import TelegramClient, TelegramCommandHandler
+from src.notifications.telegram_client import NotificationFilter, TelegramClient, TelegramCommandHandler
 from src.strategy.models import DayPlaybook
 from src.strategy.playbook_store import PlaybookStore
 from src.strategy.pre_market_planner import PreMarketPlanner
@@ -1208,6 +1208,15 @@ async def run(settings: Settings) -> None:
         bot_token=settings.TELEGRAM_BOT_TOKEN,
         chat_id=settings.TELEGRAM_CHAT_ID,
         enabled=settings.TELEGRAM_ENABLED,
+        notification_filter=NotificationFilter(
+            trades=settings.TELEGRAM_NOTIFY_TRADES,
+            market_open_close=settings.TELEGRAM_NOTIFY_MARKET_OPEN_CLOSE,
+            fat_finger=settings.TELEGRAM_NOTIFY_FAT_FINGER,
+            system_events=settings.TELEGRAM_NOTIFY_SYSTEM_EVENTS,
+            playbook=settings.TELEGRAM_NOTIFY_PLAYBOOK,
+            scenario_match=settings.TELEGRAM_NOTIFY_SCENARIO_MATCH,
+            errors=settings.TELEGRAM_NOTIFY_ERRORS,
+        ),
     )
 
     # Initialize Telegram command handler
@@ -1226,7 +1235,11 @@ async def run(settings: Settings) -> None:
             "/review - Recent scorecards\n"
             "/dashboard - Dashboard URL/status\n"
             "/stop - Pause trading\n"
-            "/resume - Resume trading"
+            "/resume - Resume trading\n"
+            "/notify - Show notification filter status\n"
+            "/notify [key] [on|off] - Toggle notification type\n"
+            "  Keys: trades, market, scenario, playbook,\n"
+            "        system, fatfinger, errors, all"
         )
         await telegram.send_message(message)
 
@@ -1479,6 +1492,63 @@ async def run(settings: Settings) -> None:
                 "<b>⚠️ Error</b>\n\nFailed to retrieve reviews."
             )
 
+    async def handle_notify(args: list[str]) -> None:
+        """Handle /notify [key] [on|off] — query or change notification filters."""
+        status = telegram.filter_status()
+
+        # /notify — show current state
+        if not args:
+            lines = ["<b>🔔 알림 필터 현재 상태</b>\n"]
+            for key, enabled in status.items():
+                icon = "✅" if enabled else "❌"
+                lines.append(f"{icon} <code>{key}</code>")
+            lines.append("\n<i>예) /notify scenario off</i>")
+            lines.append("<i>예) /notify all off</i>")
+            await telegram.send_message("\n".join(lines))
+            return
+
+        # /notify [key] — missing on/off
+        if len(args) == 1:
+            key = args[0].lower()
+            if key == "all":
+                lines = ["<b>🔔 알림 필터 현재 상태</b>\n"]
+                for k, enabled in status.items():
+                    icon = "✅" if enabled else "❌"
+                    lines.append(f"{icon} <code>{k}</code>")
+                await telegram.send_message("\n".join(lines))
+            elif key in status:
+                icon = "✅" if status[key] else "❌"
+                await telegram.send_message(
+                    f"<b>🔔 {key}</b>: {icon} {'켜짐' if status[key] else '꺼짐'}\n"
+                    f"<i>/notify {key} on  또는  /notify {key} off</i>"
+                )
+            else:
+                valid = ", ".join(list(status.keys()) + ["all"])
+                await telegram.send_message(
+                    f"❌ 알 수 없는 키: <code>{key}</code>\n"
+                    f"유효한 키: {valid}"
+                )
+            return
+
+        # /notify [key] [on|off]
+        key, toggle = args[0].lower(), args[1].lower()
+        if toggle not in ("on", "off"):
+            await telegram.send_message("❌ on 또는 off 를 입력해 주세요.")
+            return
+        value = toggle == "on"
+        if telegram.set_notification(key, value):
+            icon = "✅" if value else "❌"
+            label = f"전체 알림" if key == "all" else f"<code>{key}</code> 알림"
+            state = "켜짐" if value else "꺼짐"
+            await telegram.send_message(f"{icon} {label} → {state}")
+            logger.info("Notification filter changed via Telegram: %s=%s", key, value)
+        else:
+            valid = ", ".join(list(telegram.filter_status().keys()) + ["all"])
+            await telegram.send_message(
+                f"❌ 알 수 없는 키: <code>{key}</code>\n"
+                f"유효한 키: {valid}"
+            )
+
     async def handle_dashboard() -> None:
         """Handle /dashboard command - show dashboard URL if enabled."""
         if not settings.DASHBOARD_ENABLED:
@@ -1502,6 +1572,7 @@ async def run(settings: Settings) -> None:
     command_handler.register_command("scenarios", handle_scenarios)
     command_handler.register_command("review", handle_review)
     command_handler.register_command("dashboard", handle_dashboard)
+    command_handler.register_command_with_args("notify", handle_notify)
 
     # Initialize volatility hunter
     volatility_analyzer = VolatilityAnalyzer(min_volume_surge=2.0, min_price_change=1.0)

src/notifications/telegram_client.py

@@ -4,8 +4,9 @@ import asyncio
 import logging
 import time
 from collections.abc import Awaitable, Callable
-from dataclasses import dataclass
+from dataclasses import dataclass, fields
 from enum import Enum
+from typing import ClassVar
 
 import aiohttp
 
@@ -58,6 +59,45 @@ class LeakyBucket:
                 self._tokens -= 1.0
 
 
+@dataclass
+class NotificationFilter:
+    """Granular on/off flags for each notification type.
+
+    circuit_breaker is intentionally omitted — it is always sent regardless.
+    """
+
+    # Maps user-facing command keys to dataclass field names
+    KEYS: ClassVar[dict[str, str]] = {
+        "trades": "trades",
+        "market": "market_open_close",
+        "fatfinger": "fat_finger",
+        "system": "system_events",
+        "playbook": "playbook",
+        "scenario": "scenario_match",
+        "errors": "errors",
+    }
+
+    trades: bool = True
+    market_open_close: bool = True
+    fat_finger: bool = True
+    system_events: bool = True
+    playbook: bool = True
+    scenario_match: bool = True
+    errors: bool = True
+
+    def set_flag(self, key: str, value: bool) -> bool:
+        """Set a filter flag by user-facing key. Returns False if key is unknown."""
+        field = self.KEYS.get(key.lower())
+        if field is None:
+            return False
+        setattr(self, field, value)
+        return True
+
+    def as_dict(self) -> dict[str, bool]:
+        """Return {user_key: current_value} for display."""
+        return {k: getattr(self, field) for k, field in self.KEYS.items()}
+
+
 @dataclass
 class NotificationMessage:
     """Internal notification message structure."""
@@ -79,6 +119,7 @@ class TelegramClient:
         chat_id: str | None = None,
         enabled: bool = True,
         rate_limit: float = DEFAULT_RATE,
+        notification_filter: NotificationFilter | None = None,
     ) -> None:
         """
         Initialize Telegram client.
@@ -88,12 +129,14 @@ class TelegramClient:
             chat_id: Target chat ID (user or group)
             enabled: Enable/disable notifications globally
             rate_limit: Maximum messages per second
+            notification_filter: Granular per-type on/off flags
         """
         self._bot_token = bot_token
         self._chat_id = chat_id
         self._enabled = enabled
         self._rate_limiter = LeakyBucket(rate=rate_limit)
         self._session: aiohttp.ClientSession | None = None
+        self._filter = notification_filter if notification_filter is not None else NotificationFilter()
 
         if not enabled:
             logger.info("Telegram notifications disabled via configuration")
@@ -118,6 +161,26 @@ class TelegramClient:
         if self._session is not None and not self._session.closed:
             await self._session.close()
 
+    def set_notification(self, key: str, value: bool) -> bool:
+        """Toggle a notification type by user-facing key at runtime.
+
+        Args:
+            key: User-facing key (e.g. "scenario", "market", "all")
+            value: True to enable, False to disable
+
+        Returns:
+            True if key was valid, False if unknown.
+        """
+        if key == "all":
+            for k in NotificationFilter.KEYS:
+                self._filter.set_flag(k, value)
+            return True
+        return self._filter.set_flag(key, value)
+
+    def filter_status(self) -> dict[str, bool]:
+        """Return current per-type filter state keyed by user-facing names."""
+        return self._filter.as_dict()
+
     async def send_message(self, text: str, parse_mode: str = "HTML") -> bool:
         """
         Send a generic text message to Telegram.
@@ -193,6 +256,8 @@ class TelegramClient:
             price: Execution price
             confidence: AI confidence level (0-100)
         """
+        if not self._filter.trades:
+            return
         emoji = "🟢" if action == "BUY" else "🔴"
         message = (
             f"<b>{emoji} {action}</b>\n"
@@ -212,6 +277,8 @@ class TelegramClient:
         Args:
             market_name: Name of the market (e.g., "Korea", "United States")
         """
+        if not self._filter.market_open_close:
+            return
         message = f"<b>Market Open</b>\n{market_name} trading session started"
         await self._send_notification(
             NotificationMessage(priority=NotificationPriority.LOW, message=message)
@@ -225,6 +292,8 @@ class TelegramClient:
             market_name: Name of the market
             pnl_pct: Final P&L percentage for the session
         """
+        if not self._filter.market_open_close:
+            return
         pnl_sign = "+" if pnl_pct >= 0 else ""
         pnl_emoji = "📈" if pnl_pct >= 0 else "📉"
         message = (
@@ -271,6 +340,8 @@ class TelegramClient:
             total_cash: Total available cash
             max_pct: Maximum allowed percentage
         """
+        if not self._filter.fat_finger:
+            return
         attempted_pct = (order_amount / total_cash) * 100 if total_cash > 0 else 0
         message = (
             f"<b>Fat-Finger Protection</b>\n"
@@ -293,6 +364,8 @@ class TelegramClient:
             mode: Trading mode ("paper" or "live")
             enabled_markets: List of enabled market codes
         """
+        if not self._filter.system_events:
+            return
         mode_emoji = "📝" if mode == "paper" else "💰"
         markets_str = ", ".join(enabled_markets)
         message = (
@@ -320,6 +393,8 @@ class TelegramClient:
             scenario_count: Total number of scenarios
             token_count: Gemini token usage for the playbook
         """
+        if not self._filter.playbook:
+            return
         message = (
             f"<b>Playbook Generated</b>\n"
             f"Market: {market}\n"
@@ -347,6 +422,8 @@ class TelegramClient:
             condition_summary: Short summary of the matched condition
             confidence: Scenario confidence (0-100)
         """
+        if not self._filter.scenario_match:
+            return
         message = (
             f"<b>Scenario Matched</b>\n"
             f"Symbol: <code>{stock_code}</code>\n"
@@ -366,6 +443,8 @@ class TelegramClient:
             market: Market code (e.g., "KR", "US")
             reason: Failure reason summary
         """
+        if not self._filter.playbook:
+            return
         message = (
             f"<b>Playbook Failed</b>\n"
             f"Market: {market}\n"
@@ -382,6 +461,8 @@ class TelegramClient:
         Args:
             reason: Reason for shutdown (e.g., "Normal shutdown", "Circuit breaker")
         """
+        if not self._filter.system_events:
+            return
         message = f"<b>System Shutdown</b>\n{reason}"
         priority = (
             NotificationPriority.CRITICAL
@@ -403,6 +484,8 @@ class TelegramClient:
             error_msg: Error message
             context: Error context (e.g., stock code, market)
         """
+        if not self._filter.errors:
+            return
         message = (
             f"<b>Error: {error_type}</b>\n"
             f"Context: {context}\n"
@@ -429,6 +512,7 @@ class TelegramCommandHandler:
         self._client = client
         self._polling_interval = polling_interval
         self._commands: dict[str, Callable[[], Awaitable[None]]] = {}
+        self._commands_with_args: dict[str, Callable[[list[str]], Awaitable[None]]] = {}
         self._last_update_id = 0
         self._polling_task: asyncio.Task[None] | None = None
         self._running = False
@@ -437,7 +521,7 @@ class TelegramCommandHandler:
         self, command: str, handler: Callable[[], Awaitable[None]]
     ) -> None:
         """
-        Register a command handler.
+        Register a command handler (no arguments).
 
         Args:
             command: Command name (without leading slash, e.g., "start")
@@ -446,6 +530,19 @@ class TelegramCommandHandler:
         self._commands[command] = handler
         logger.debug("Registered command handler: /%s", command)
 
+    def register_command_with_args(
+        self, command: str, handler: Callable[[list[str]], Awaitable[None]]
+    ) -> None:
+        """
+        Register a command handler that receives trailing arguments.
+
+        Args:
+            command: Command name (without leading slash, e.g., "notify")
+            handler: Async function receiving list of argument tokens
+        """
+        self._commands_with_args[command] = handler
+        logger.debug("Registered command handler (with args): /%s", command)
+
     async def start_polling(self) -> None:
         """Start long polling for commands."""
         if self._running:
@@ -566,11 +663,14 @@ class TelegramCommandHandler:
             # Remove @botname suffix if present (for group chats)
             command_name = command_parts[0].split("@")[0]
 
-            # Execute handler
-            handler = self._commands.get(command_name)
-            if handler:
+            # Execute handler (args-aware handlers take priority)
+            args_handler = self._commands_with_args.get(command_name)
+            if args_handler:
+                logger.info("Executing command: /%s %s", command_name, command_parts[1:])
+                await args_handler(command_parts[1:])
+            elif command_name in self._commands:
                 logger.info("Executing command: /%s", command_name)
-                await handler()
+                await self._commands[command_name]()
             else:
                 logger.debug("Unknown command: /%s", command_name)
                 await self._client.send_message(

tests/test_telegram.py

@@ -5,7 +5,7 @@ from unittest.mock import AsyncMock, patch
 import aiohttp
 import pytest
 
-from src.notifications.telegram_client import NotificationPriority, TelegramClient
+from src.notifications.telegram_client import NotificationFilter, NotificationPriority, TelegramClient
 
 
 class TestTelegramClientInit:
@@ -481,3 +481,187 @@ class TestClientCleanup:
 
         # Should not raise exception
         await client.close()
+
+
+class TestNotificationFilter:
+    """Test granular notification filter behavior."""
+
+    def test_default_filter_allows_all(self) -> None:
+        """Default NotificationFilter has all flags enabled."""
+        f = NotificationFilter()
+        assert f.trades is True
+        assert f.market_open_close is True
+        assert f.fat_finger is True
+        assert f.system_events is True
+        assert f.playbook is True
+        assert f.scenario_match is True
+        assert f.errors is True
+
+    def test_client_uses_default_filter_when_none_given(self) -> None:
+        """TelegramClient creates a default NotificationFilter when none provided."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        assert isinstance(client._filter, NotificationFilter)
+        assert client._filter.scenario_match is True
+
+    def test_client_stores_provided_filter(self) -> None:
+        """TelegramClient stores a custom NotificationFilter."""
+        nf = NotificationFilter(scenario_match=False, trades=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        assert client._filter.scenario_match is False
+        assert client._filter.trades is False
+        assert client._filter.market_open_close is True  # default still True
+
+    @pytest.mark.asyncio
+    async def test_scenario_match_filtered_does_not_send(self) -> None:
+        """notify_scenario_matched skips send when scenario_match=False."""
+        nf = NotificationFilter(scenario_match=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        with patch("aiohttp.ClientSession.post") as mock_post:
+            await client.notify_scenario_matched(
+                stock_code="005930", action="BUY", condition_summary="rsi<30", confidence=85.0
+            )
+            mock_post.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_trades_filtered_does_not_send(self) -> None:
+        """notify_trade_execution skips send when trades=False."""
+        nf = NotificationFilter(trades=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        with patch("aiohttp.ClientSession.post") as mock_post:
+            await client.notify_trade_execution(
+                stock_code="005930", market="KR", action="BUY",
+                quantity=10, price=70000.0, confidence=85.0
+            )
+            mock_post.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_market_open_close_filtered_does_not_send(self) -> None:
+        """notify_market_open/close skip send when market_open_close=False."""
+        nf = NotificationFilter(market_open_close=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        with patch("aiohttp.ClientSession.post") as mock_post:
+            await client.notify_market_open("Korea")
+            await client.notify_market_close("Korea", pnl_pct=1.5)
+            mock_post.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_circuit_breaker_always_sends_regardless_of_filter(self) -> None:
+        """notify_circuit_breaker always sends (no filter flag)."""
+        nf = NotificationFilter(
+            trades=False, market_open_close=False, fat_finger=False,
+            system_events=False, playbook=False, scenario_match=False, errors=False,
+        )
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        mock_resp = AsyncMock()
+        mock_resp.status = 200
+        mock_resp.__aenter__ = AsyncMock(return_value=mock_resp)
+        mock_resp.__aexit__ = AsyncMock(return_value=False)
+
+        with patch("aiohttp.ClientSession.post", return_value=mock_resp) as mock_post:
+            await client.notify_circuit_breaker(pnl_pct=-3.5, threshold=-3.0)
+            assert mock_post.call_count == 1
+
+    @pytest.mark.asyncio
+    async def test_errors_filtered_does_not_send(self) -> None:
+        """notify_error skips send when errors=False."""
+        nf = NotificationFilter(errors=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        with patch("aiohttp.ClientSession.post") as mock_post:
+            await client.notify_error("TestError", "something went wrong", "KR")
+            mock_post.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_playbook_filtered_does_not_send(self) -> None:
+        """notify_playbook_generated/failed skip send when playbook=False."""
+        nf = NotificationFilter(playbook=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        with patch("aiohttp.ClientSession.post") as mock_post:
+            await client.notify_playbook_generated("KR", 3, 10, 1200)
+            await client.notify_playbook_failed("KR", "timeout")
+            mock_post.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_system_events_filtered_does_not_send(self) -> None:
+        """notify_system_start/shutdown skip send when system_events=False."""
+        nf = NotificationFilter(system_events=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        with patch("aiohttp.ClientSession.post") as mock_post:
+            await client.notify_system_start("paper", ["KR"])
+            await client.notify_system_shutdown("Normal shutdown")
+            mock_post.assert_not_called()
+
+    def test_set_flag_valid_key(self) -> None:
+        """set_flag returns True and updates field for a known key."""
+        nf = NotificationFilter()
+        assert nf.set_flag("scenario", False) is True
+        assert nf.scenario_match is False
+
+    def test_set_flag_invalid_key(self) -> None:
+        """set_flag returns False for an unknown key."""
+        nf = NotificationFilter()
+        assert nf.set_flag("unknown_key", False) is False
+
+    def test_as_dict_keys_match_KEYS(self) -> None:
+        """as_dict() returns every key defined in KEYS."""
+        nf = NotificationFilter()
+        d = nf.as_dict()
+        assert set(d.keys()) == set(NotificationFilter.KEYS.keys())
+
+    def test_set_notification_valid_key(self) -> None:
+        """TelegramClient.set_notification toggles filter at runtime."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        assert client._filter.scenario_match is True
+        assert client.set_notification("scenario", False) is True
+        assert client._filter.scenario_match is False
+
+    def test_set_notification_all_off(self) -> None:
+        """set_notification('all', False) disables every filter flag."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        assert client.set_notification("all", False) is True
+        for v in client.filter_status().values():
+            assert v is False
+
+    def test_set_notification_all_on(self) -> None:
+        """set_notification('all', True) enables every filter flag."""
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True,
+            notification_filter=NotificationFilter(
+                trades=False, market_open_close=False, scenario_match=False,
+                fat_finger=False, system_events=False, playbook=False, errors=False,
+            ),
+        )
+        assert client.set_notification("all", True) is True
+        for v in client.filter_status().values():
+            assert v is True
+
+    def test_set_notification_unknown_key(self) -> None:
+        """set_notification returns False for an unknown key."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        assert client.set_notification("unknown", False) is False
+
+    def test_filter_status_reflects_current_state(self) -> None:
+        """filter_status() matches the current NotificationFilter state."""
+        nf = NotificationFilter(trades=False, scenario_match=False)
+        client = TelegramClient(
+            bot_token="123:abc", chat_id="456", enabled=True, notification_filter=nf
+        )
+        status = client.filter_status()
+        assert status["trades"] is False
+        assert status["scenario"] is False
+        assert status["market"] is True

tests/test_telegram_commands.py

@@ -875,3 +875,91 @@ class TestGetUpdates:
             updates = await handler._get_updates()
 
             assert updates == []
+
+
+class TestCommandWithArgs:
+    """Test register_command_with_args and argument dispatch."""
+
+    def test_register_command_with_args_stored(self) -> None:
+        """register_command_with_args stores handler in _commands_with_args."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        async def my_handler(args: list[str]) -> None:
+            pass
+
+        handler.register_command_with_args("notify", my_handler)
+        assert "notify" in handler._commands_with_args
+        assert handler._commands_with_args["notify"] is my_handler
+
+    @pytest.mark.asyncio
+    async def test_args_handler_receives_arguments(self) -> None:
+        """Args handler is called with the trailing tokens."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        received: list[list[str]] = []
+
+        async def capture(args: list[str]) -> None:
+            received.append(args)
+
+        handler.register_command_with_args("notify", capture)
+
+        update = {
+            "message": {
+                "chat": {"id": "456"},
+                "text": "/notify scenario off",
+            }
+        }
+        await handler._handle_update(update)
+        assert received == [["scenario", "off"]]
+
+    @pytest.mark.asyncio
+    async def test_args_handler_takes_priority_over_no_args_handler(self) -> None:
+        """When both handlers exist for same command, args handler wins."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        no_args_called = []
+        args_called = []
+
+        async def no_args_handler() -> None:
+            no_args_called.append(True)
+
+        async def args_handler(args: list[str]) -> None:
+            args_called.append(args)
+
+        handler.register_command("notify", no_args_handler)
+        handler.register_command_with_args("notify", args_handler)
+
+        update = {
+            "message": {
+                "chat": {"id": "456"},
+                "text": "/notify all off",
+            }
+        }
+        await handler._handle_update(update)
+        assert args_called == [["all", "off"]]
+        assert no_args_called == []
+
+    @pytest.mark.asyncio
+    async def test_args_handler_with_no_trailing_args(self) -> None:
+        """/notify with no args still dispatches to args handler with empty list."""
+        client = TelegramClient(bot_token="123:abc", chat_id="456", enabled=True)
+        handler = TelegramCommandHandler(client)
+
+        received: list[list[str]] = []
+
+        async def capture(args: list[str]) -> None:
+            received.append(args)
+
+        handler.register_command_with_args("notify", capture)
+
+        update = {
+            "message": {
+                "chat": {"id": "456"},
+                "text": "/notify",
+            }
+        }
+        await handler._handle_update(update)
+        assert received == [[]]