diff --git a/agent/application/states/models.py b/agent/application/states/models.py
index 9c57645..8f3f0b1 100644
--- a/agent/application/states/models.py
+++ b/agent/application/states/models.py
@@ -57,7 +57,9 @@ def usage_to_object(usage: dict[str, Any]) -> RunUsage:
     """
     Usage 转为对象
     """
-    return UsageAdapter.validate_python(usage) if usage else RunUsage()
+    if isinstance(usage, dict) and usage:
+        return UsageAdapter.validate_python(usage)
+    return RunUsage()
 
 
 def usage_to_dict(usage: RunUsage) -> dict[str, Any]:
@@ -75,11 +77,9 @@ def usage_limits_to_object(usage_limits: dict[str, Any]) -> UsageLimits:
     """
     UsageLimits 转为对象
     """
-    return (
-        UsageLimitsAdapter.validate_python(usage_limits)
-        if usage_limits
-        else UsageLimits()
-    )
+    if isinstance(usage_limits, dict) and usage_limits:
+        return UsageLimitsAdapter.validate_python(usage_limits)
+    return UsageLimits(request_limit=5)
 
 
 def usage_limits_to_dict(usage_limits: UsageLimits) -> dict[str, Any]:
@@ -104,7 +104,7 @@ class Task(BaseModel):
 
     id: str = Field(default_factory=lambda: str(uuid7()), description="任务唯一标识")
     type: TaskType = Field(..., description="任务类型")
-    node: str | None = Field(default="", description="任务节点")
+    node: str = Field(default="", description="任务节点")
     deps: Any = Field(default=None, description="任务依赖项")
     usage: dict[str, Any] = Field(default_factory=dict, description="任务使用量")
     usage_limits: dict[str, Any] = Field(
diff --git a/agent/application/tasks/book_flight.py b/agent/application/tasks/book_flight.py
index e891865..4e13ec1 100644
--- a/agent/application/tasks/book_flight.py
+++ b/agent/application/tasks/book_flight.py
@@ -13,12 +13,11 @@ from application.states.models import (
     Task,
     TaskNodeResultEvent,
     TaskType,
-    usage_limits_to_dict,
     usage_limits_to_object,
     usage_to_dict,
     usage_to_object,
 )
-from application.tasks.models import DEEPSEEK_V4_FLASH_MODEL
+from application.tasks.models import DEEPSEEK_V4_FLASH_MODEL, MODEL_SETTINGS
 
 
 class Deps(BaseModel):
@@ -53,6 +52,7 @@ class NoFlightFound(BaseModel):
 # 航班查询智能体
 flight_search_agent = Agent[Deps, FlightDetail | NoFlightFound](
     model=DEEPSEEK_V4_FLASH_MODEL,
+    model_settings=MODEL_SETTINGS,
     deps_type=Deps,
     output_type=FlightDetail | NoFlightFound,
     system_prompt="你的工作是在给定日期、出发机场和到达机场为用户找到最便宜的航班",
@@ -61,6 +61,7 @@ flight_search_agent = Agent[Deps, FlightDetail | NoFlightFound](
 # 所有航班详情提取智能体
 flight_details_extraction_agent = Agent(
     model=DEEPSEEK_V4_FLASH_MODEL,
+    model_settings=MODEL_SETTINGS,
     output_type=list[FlightDetail],
     system_prompt="从给定文本中提取所有航班详细，包括航班号、航班日期、出发机场、到达机场和机票价格",
 )
@@ -117,6 +118,7 @@ class NoSeatExtracted(BaseModel):
 # 提取座位偏好智能体（无依赖项）
 seat_preference_extraction_agent = Agent[object, SeatPreference | NoSeatExtracted](
     model=DEEPSEEK_V4_FLASH_MODEL,
+    model_settings=MODEL_SETTINGS,
     output_type=SeatPreference | NoSeatExtracted,
     system_prompt="提取用户的座位偏好。座位规则说明：A 座、F 座为靠窗座位；第 1 排是前排座位，腿部空间更大；14 排、20 排同样拥有加宽腿部空间",
 )
@@ -175,7 +177,6 @@ def init_task() -> Task:
             origin="SFO",
             destination="ANC",
         ),
-        usage_limits=usage_limits_to_dict(UsageLimits(request_limit=5)),
     )
 
 
@@ -196,8 +197,8 @@ async def run_stream_events(
                     user_prompt=user_prompt,
                     deps=task.deps,
                     message_history=message_history,
-                    usage=usage_to_object(task.usage),
-                    usage_limits=usage_limits_to_object(task.usage_limits),
+                    usage=usage_to_object(dict(task.usage)),
+                    usage_limits=usage_limits_to_object(dict(task.usage_limits)),
                 ) as events:
                     async for event in events:
                         if not isinstance(event, AgentRunResultEvent):
@@ -241,8 +242,8 @@ async def run_stream_events(
                     async with seat_preference_extraction_agent.run_stream_events(
                         user_prompt=user_prompt,
                         message_history=message_history,
-                        usage=usage_to_object(task.usage),
-                        usage_limits=usage_limits_to_object(task.usage_limits),
+                        usage=usage_to_object(dict(task.usage)),
+                        usage_limits=usage_limits_to_object(dict(task.usage_limits)),
                     ) as events:
                         async for event in events:
                             if not isinstance(event, AgentRunResultEvent):
diff --git a/agent/application/tasks/models.py b/agent/application/tasks/models.py
index a9ad39b..cd8e64c 100644
--- a/agent/application/tasks/models.py
+++ b/agent/application/tasks/models.py
@@ -2,10 +2,10 @@
 """
 智能体相关模块
 """
-from pydantic_ai.models.openai import OpenAIChatModel
+from pydantic_ai import ModelSettings
+from pydantic_ai.models.openai import OpenAIChatModel, OpenAIChatModelSettings
 from pydantic_ai.providers.openai import OpenAIProvider
 
-
 DEEPSEEK_V4_FLASH_MODEL = OpenAIChatModel(
     model_name="deepseek-v4-flash",
     provider=OpenAIProvider(
@@ -13,3 +13,5 @@ DEEPSEEK_V4_FLASH_MODEL = OpenAIChatModel(
         api_key="sk-D9Y1mCe8VlvNqLuSC4mAjqEwxJ2nW4C0h8a7EPn8kg9RLsHq",
     ),
 )
+
+MODEL_SETTINGS = ModelSettings(extra_body={"thinking": {"type": "disabled"}})
diff --git a/agent/database.db b/agent/database.db
index e377289..9ef11eb 100644
Binary files a/agent/database.db and b/agent/database.db differ