diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f6bc6d6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,14 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+.eggs/
+build/
+dist/
+.venv/
+venv/
+.coverage
+htmlcov/
+.pytest_cache/
+.mypy_cache/
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index 7a67356..0000000
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diff --git a/detector/__pycache__/rule_loader.cpython-310.pyc b/detector/__pycache__/rule_loader.cpython-310.pyc
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diff --git a/detector/__pycache__/storage.cpython-310.pyc b/detector/__pycache__/storage.cpython-310.pyc
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diff --git a/detector/api.py b/detector/api.py
index 4cf3e8c..ec52e89 100644
--- a/detector/api.py
+++ b/detector/api.py
@@ -17,6 +17,7 @@ import json
 import re
 import threading
 import time
+import uuid
 from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
 from typing import Any, Callable, Dict, List, Optional, Tuple
 from urllib.parse import urlparse
@@ -170,9 +171,10 @@ class APIServer:
 
     def handle_create_rule(self, handler) -> None:
         data = handler._read_json()
+        # api-design：POST /rules 允许不传 rule_id，服务端自动生成。
+        if not data.get("rule_id"):
+            data["rule_id"] = f"r-{uuid.uuid4().hex[:12]}"
         rule = MetricRule.from_dict(data)
-        if not rule.rule_id:
-            raise _APIError(400, 40001, "rule_id is required")
         created = self.app.rule_store.create_rule(rule)
         self.app.rule_loader.load()
         handler._write_json(200, {"code": 0, "message": "ok", "data": created.to_dict()})
diff --git a/detector/converger.py b/detector/converger.py
index a6f9f61..1fe9bfd 100644
--- a/detector/converger.py
+++ b/detector/converger.py
@@ -73,11 +73,14 @@ class AlertConverger:
             count=1,
             first_at=event.fired_at,
             last_at=event.fired_at,
+            notify_channels=list(event.notify_channels),
         )
         stored = self.alert_store.upsert_firing(alert)
+        # 聚合更新时使用已存在告警的渠道列表，避免覆盖丢失
+        channels = stored.notify_channels or event.notify_channels
         self._publish(stored)
         if self.notifier is not None and hasattr(self.notifier, "notify"):
-            self.notifier.notify(stored, getattr(stored, "notify_channels", None) or self._channels(event))
+            self.notifier.notify(stored, channels)
         return stored
 
     def _handle_resolved(self, event: Event) -> Optional[Alert]:
@@ -98,4 +101,4 @@ class AlertConverger:
 
     @staticmethod
     def _channels(event: Event) -> List[str]:
-        return []
+        return list(event.notify_channels)
diff --git a/detector/engine.py b/detector/engine.py
index 75c98f8..9f477f8 100644
--- a/detector/engine.py
+++ b/detector/engine.py
@@ -227,6 +227,7 @@ class DetectionEngine:
             severity=rule.severity,
             fired_at=now,
             labels=dict(sample.labels),
+            notify_channels=list(rule.notify_channels),
         )
 
     # ------------------------------------------------------------------ #
diff --git a/detector/models.py b/detector/models.py
index fca3db2..0077113 100644
--- a/detector/models.py
+++ b/detector/models.py
@@ -153,7 +153,7 @@ class MetricRule:
     @classmethod
     def from_dict(cls, data: Dict[str, Any]) -> "MetricRule":
         return cls(
-            rule_id=str(data["rule_id"]),
+            rule_id=str(data.get("rule_id") or ""),
             name=str(data.get("name") or ""),
             metric=str(data.get("metric") or ""),
             aggregation=str(data.get("aggregation") or "avg"),
@@ -185,6 +185,7 @@ class Event:
     severity: str
     fired_at: float
     labels: Dict[str, str] = field(default_factory=dict)
+    notify_channels: List[str] = field(default_factory=list)
 
     def to_dict(self) -> Dict[str, Any]:
         return {
@@ -199,6 +200,7 @@ class Event:
             "severity": self.severity,
             "fired_at": self.fired_at,
             "labels": self.labels,
+            "notify_channels": list(self.notify_channels),
         }
 
 
@@ -219,6 +221,7 @@ class Alert:
     ack_status: str = "open"
     ack_by: Optional[str] = None
     ack_at: Optional[float] = None
+    notify_channels: List[str] = field(default_factory=list)
 
     def to_dict(self) -> Dict[str, Any]:
         return {
@@ -235,4 +238,5 @@ class Alert:
             "ack_status": self.ack_status,
             "ack_by": self.ack_by,
             "ack_at": self.ack_at,
+            "notify_channels": list(self.notify_channels),
         }
diff --git a/tests/__pycache__/test_api.cpython-310.pyc b/tests/__pycache__/test_api.cpython-310.pyc
deleted file mode 100644
index b6c02b5..0000000
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diff --git a/tests/__pycache__/test_converger.cpython-310.pyc b/tests/__pycache__/test_converger.cpython-310.pyc
deleted file mode 100644
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diff --git a/tests/__pycache__/test_models.cpython-310.pyc b/tests/__pycache__/test_models.cpython-310.pyc
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diff --git a/tests/__pycache__/test_notifier.cpython-310.pyc b/tests/__pycache__/test_notifier.cpython-310.pyc
deleted file mode 100644
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diff --git a/tests/__pycache__/test_rule_loader.cpython-310.pyc b/tests/__pycache__/test_rule_loader.cpython-310.pyc
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diff --git a/tests/test_api.py b/tests/test_api.py
index cc2da54..a23777d 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -73,6 +73,23 @@ class TestAPI(unittest.TestCase):
         self.assertEqual(status, 200)
         self.assertEqual(body["data"]["threshold"], 5.0)
 
+    def test_create_rule_autogenerates_id(self):
+        payload = {
+            "name": "load high",
+            "metric": "load_1m",
+            "aggregation": "avg",
+            "operator": "gt",
+            "threshold": 5.0,
+            "for_duration": "60s",
+            "severity": "warning",
+            "scope": {"scope_type": "all"},
+            "notify_channels": ["email"],
+            "enabled": True,
+        }
+        status, body = self._request("POST", "/api/v1/rules", payload)
+        self.assertEqual(status, 200)
+        self.assertTrue(body["data"]["rule_id"].startswith("r-"))
+
     def test_ingest_triggers_firing_event(self):
         samples = [
             {"name": "cpu_usage", "value": 95.0, "timestamp": float(i * 15), "labels": {"service": "web"}}
diff --git a/tests/test_converger.py b/tests/test_converger.py
index 0f4b181..419325b 100644
--- a/tests/test_converger.py
+++ b/tests/test_converger.py
@@ -2,6 +2,7 @@ import unittest
 
 from detector.converger import AlertConverger
 from detector.models import Event
+from detector.notifier import Notifier
 from detector.storage import InMemoryAlertStore, InMemoryCache, InMemoryMessageBus
 
 
@@ -66,6 +67,17 @@ class TestAlertConverger(unittest.TestCase):
         self.assertEqual(topic, "alerts.converged")
         self.assertIn("alert_id", value)
 
+    def test_notify_channels_propagated(self):
+        notifier = Notifier.memory(["email", "webhook"])
+        conv = AlertConverger(
+            self.store, self.cache, self.bus, dedup_window="5m", aggregate_window="1m",
+            host_group_resolver=lambda h: "web", notifier=notifier,
+        )
+        event = make_event()
+        event.notify_channels = ["email"]
+        conv.handle_event(event)
+        self.assertEqual(notifier.sent[0]["channel"], "email")
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tests/test_engine.py b/tests/test_engine.py
index a2469e5..265b771 100644
--- a/tests/test_engine.py
+++ b/tests/test_engine.py
@@ -17,6 +17,7 @@ def make_rule(rule_id="r-cpu", metric="cpu_usage", operator="gt", threshold=90.0
         for_duration=for_duration,
         severity="critical",
         scope=RuleScope(scope_type="all"),
+        notify_channels=["email", "webhook"],
     )
 
 
@@ -102,6 +103,15 @@ class TestStateMachine(unittest.TestCase):
         self.assertEqual(events, [])
         self.assertEqual(engine.state_of("h-1", rule.rule_id)["status"], "firing")
 
+    def test_event_carries_notify_channels(self):
+        rule = make_rule(for_duration="60s")
+        engine = make_engine(rule)
+        events = []
+        for i in range(5):
+            events.extend(engine.handle(MetricSample(name="cpu_usage", value=95.0, timestamp=float(i * 15)), "h-1"))
+        self.assertEqual(len(events), 1)
+        self.assertEqual(events[0].notify_channels, ["email", "webhook"])
+
 
 if __name__ == "__main__":
     unittest.main()