[全量] 初始化项目代码、配置、文档及Agent协同harness

langchain-chat/server/agent/tools/search_youtube.py

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+# Langchain 自带的 YouTube 搜索工具封装
+from langchain.tools import YouTubeSearchTool
+from pydantic import BaseModel, Field
+def search_youtube(query: str):
+    tool = YouTubeSearchTool()
+    return tool.run(tool_input=query)
+
+class YoutubeInput(BaseModel):
+    location: str = Field(description="Query for Videos search")