diff --git a/app/api/v1/auth.py b/app/api/v1/auth.py
index a8c3141..5627cdf 100644
--- a/app/api/v1/auth.py
+++ b/app/api/v1/auth.py
@@ -207,7 +207,8 @@ def sms_send(req: SmsSendRequest, request: Request, db: DbSession) -> SmsSendRes
     check_rate_limits(request, subject=req.device_id, rules=send_rules)
 
     try:
-        cooldown = send_code(req.phone)
+        send_result = send_code(req.phone)
+        cooldown = send_result.cooldown_sec
     except SmsError as e:
         risk_repo.record_behavior_event(
             db,
@@ -238,7 +239,9 @@ def sms_send(req: SmsSendRequest, request: Request, db: DbSession) -> SmsSendRes
         phone=req.phone,
         client_ip=_client_ip(request),
         outcome="success",
-        details={"mock": settings.SMS_MOCK},
+        details={"mock": settings.SMS_MOCK,
+                 "provider": send_result.provider,
+                 "fallback": send_result.fallback},
         evaluate_rule=risk_repo.RULE_SMS_HOURLY,
     )
 
diff --git a/tests/test_auth.py b/tests/test_auth.py
index 42d9add..bdf068c 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -68,6 +68,29 @@ def test_sms_login_and_me_flow(client) -> None:
     assert r.json()["ok"] is True
 
 
+def test_sms_send_records_provider_and_fallback_in_details(client, monkeypatch) -> None:
+    """批次3(Task 6):sms_send 成功后风控流水 details 带 provider/fallback。
+    mock 默认走极光主(SMS_FALLBACK_PROVIDER 空)→ provider=jiguang、fallback=False。
+    (回归:修复前 send_code 返回 SendResult 被塞进 cooldown_sec:int → 500,此处 200 断言即挡住。)"""
+    from app.repositories import risk as risk_repo
+
+    captured: dict = {}
+    orig = risk_repo.record_behavior_event
+
+    def _spy(db, **kw):
+        if kw.get("event_type") == risk_repo.EVENT_SMS_SEND and kw.get("outcome") == "success":
+            captured.update(kw.get("details") or {})
+        return orig(db, **kw)
+
+    monkeypatch.setattr(risk_repo, "record_behavior_event", _spy)
+
+    r = client.post("/api/v1/auth/sms/send",
+                    json={"phone": "13800009999", "device_id": "dev-provider-test"})
+    assert r.status_code == 200, r.text
+    assert captured.get("provider") == "jiguang"
+    assert captured.get("fallback") is False
+
+
 def test_sms_send_too_frequent(client) -> None:
     phone = "13900139000"
     assert client.post("/api/v1/auth/sms/send", json={"phone": phone}).status_code == 200